41,669 results match your criteria Chemical Communications [Journal]


Catalysis: energy is the measure of all things.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

Department of Chemistry, Ben-Gurion University of the Negev, Beer-Sheva 841051, Israel.

Is there any place in the extremely well-established field of catalytic kinetics for new interpretations or novel models that can change the basic doctrines and viewpoints of catalytic cycles? Since the first introduction of the energy span model, we started to believe that indeed there is. Herein we will evaluate from mathematical, physical and applied perspectives the advantages in using the energy representation for the depiction of the kinetics of catalysis, compared to the usual rate constant representation. We will discuss many concepts such as the energy span, the determining states, the determining zone, graph theory, affinity, degrees of rate control, robustness and volcano plots. Read More

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http://dx.doi.org/10.1039/c9cc00754gDOI Listing

Crystal melting and glass formation in copper thiocyanate based coordination polymers.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

AIST-Kyoto University Chemical Energy Materials Open Innovation Laboratory (ChEM-OIL), National Institute of Advanced Industrial Science and Technology (AIST), Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan and Department of Synthetic Chemistry and Biological Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan and Institute for Integrated Cell-Material Sciences, Institute for Advanced Study, Kyoto University, Yoshida-Honmachi, Sakyo-ku, Kyoto 606-8501, Japan and Department of Materials Science and Engineering, School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Rayong 21210, Thailand.

Crystal melting and glass formation of coordination polymers (CPs) and metal-organic frameworks (MOFs) are rare thermal events. To expand the library of melting CP/MOFs, we utilized anti-crystal engineering in ionic liquids to construct CPs. A combination of Cu+ and 4,4'-bipyridin-1-ium derivatives afforded four melting CPs showing stable liquid and glassy states. Read More

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http://xlink.rsc.org/?DOI=C9CC02172H
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http://dx.doi.org/10.1039/c9cc02172hDOI Listing
April 2019
1 Read

Liquid crystalline microspheres of azobenzene amphiphiles formed by thermally induced pH changes in binary water-hydrolytic ionic liquid media.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan. and Center for Molecular Systems (CMS), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.

Anionic azobenzene-containing bilayered membranes dispersed in binary water-ionic liquid (IL) media undergo proton-responsive transformation into liquid crystalline microspheres (LCMs). This transformation was induced by protons released by the heat-induced hydrolysis of tetrafluoroborate ions in the ILs. This work demonstrates the first beneficial use of hydrolysis-susceptible ILs in chemistry. Read More

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http://dx.doi.org/10.1039/c9cc01731cDOI Listing

pH-Dependent structure of water-exposed surfaces of CdSe quantum dots.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

Department of Chemistry, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208-3113, USA.

Increasing negative charge density at the surfaces of CdSe quantum dots (QDs) effects a bathochromic shift of their ground state optical spectra with increasing pH due to electrostatic and chemical modifications at the QD surface. These modifications are enabled by weakly-bound ligands that expose the surface to the aqueous environment. Read More

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http://xlink.rsc.org/?DOI=C9CC01339C
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http://dx.doi.org/10.1039/c9cc01339cDOI Listing
April 2019
2 Reads

Stable Sn doped FAPbI nanocrystals for near-infrared LEDs.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

Energy Research Institute@NTU (ERI@N), Nanyang Technological University, Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang Drive, 637553, Singapore. and School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.

Herein, we report Sn2+ doping in FAPbI3 NCs to stabilize the α-phase, while using propionic acid as a co-ligand. The Sn2+ doping enhances the emission quantum yield from 35% to 63% and dramatically improves the colloidal and phase stability. Also, we demonstrated the use of Sn doped FAPbI3 NCs in near-infrared (NIR) LEDs. Read More

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http://xlink.rsc.org/?DOI=C9CC01526D
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http://dx.doi.org/10.1039/c9cc01526dDOI Listing
April 2019
1 Read

Optimizing electron transfer from CdSe QDs to hydrogenase for photocatalytic H production.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

Department of Chemistry, Emory University, Atlanta, GA 30322, USA.

A series of viologen related redox mediators of varying reduction potential has been characterized and their utility as electron shuttles between CdSe quantum dots and hydrogenase enzyme has been demonstrated. Tuning the mediator LUMO energy optimizes the performance of this hybrid photocatalytic system by balancing electron transfer rates of the shuttle. Read More

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http://dx.doi.org/10.1039/c9cc01150aDOI Listing
April 2019
1 Read

DNA-mediated reversible capture and release of circulating tumor cells with a multivalent dual-specific aptamer coating network.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

MOE Key Laboratory for Analytical Science of Food Safety and Biology, Fujian Provincial Key Laboratory of Analysis and Detection Technology for Food Safety, State Key Laboratory of Photocatalysis on Energy and Environment, College of Chemistry, Fuzhou University, Fuzhou 350116, P. R. China.

DNA-triggered reversible isolation and recovery of circulating tumor cells (CTCs) is presented based on a multivalent dual-specific aptamer-tethered rolling circle amplification (MA-RCA) network. The multivalent binding sites endow the MA-RCA network with a strong binding ability towards CTCs, and the repeated cell capture/release processes are also actualized in a noninvasive manner. Read More

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http://dx.doi.org/10.1039/c9cc02365hDOI Listing

Tandem catalysis by ultrathin metal-organic nanosheets formed through post-synthetic functionalisation of a layered framework.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

Department of Chemistry, University of Sheffield, Sheffield, UK.

Covalent post-synthetic functionalisation of layered metal-organic frameworks is demonstrated as a new approach to forming ultrathin nanosheets for use in catalysis. An aminoterephthalate framework was partially functionalised with sulfonate chains and exfoliated to form predominantly monolayer nanosheets able to catalyse a two-step acid-base reaction in one pot. Read More

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http://dx.doi.org/10.1039/c9cc02061fDOI Listing
April 2019
3 Reads

Open-shell jellium aromaticity in metal clusters.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany, 69, 17003 Girona, Catalonia, Spain.

The 2N2 + 2N + 1 with S = N + 1/2 rule represented the extension to open-shell spherical compounds of the 2(N + 1)2 Hirsch rule for spherical aromatic species. In this work, we provide evidence that the jellium model with its magic numbers can also be extended to open-shell half-filled systems. Read More

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http://dx.doi.org/10.1039/c9cc02067eDOI Listing
April 2019
2 Reads

Enantioselective conjugate addition of an α,α-dithioacetonitrile with nitroalkenes using chiral bis(imidazoline)-Pd complexes.

Chem Commun (Camb) 2019 Apr 18. Epub 2019 Apr 18.

Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan. and Frontier Research Institute for Material Science, Nagoya Institute of Technology, Gokiso, Showa-ku, Nagoya 466-8555, Japan.

The enantioselective conjugate addition reaction of an α,α-dithioacetonitrile with nitroalkenes was catalysed by chiral bis(imidazoline)-palladium pincer-type complexes. The reaction was applicable to various nitroalkenes to afford products in good yield with high enantioselectivity. The obtained products can be converted to γ-lactam and biologically active rolipram. Read More

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http://dx.doi.org/10.1039/c9cc02443cDOI Listing

Preferential synthesis of ethanol from syngas via dimethyl oxalate hydrogenation over an integrated catalyst.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Key Laboratory for Green Chemical Technology of Ministry of Education, Collaborative Innovation Center of Chemical Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.

An integrated catalyst that contains Fe5C2 and CuZnO-SiO2 with a dual-bed configuration was designed for the preferential synthesis of ethanol via dimethyl oxalate hydrogenation. The cooperation of the two catalyst components remarkably inhibited the formation of various byproducts, resulting in a significantly high ethanol yield of about 98%. Read More

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http://dx.doi.org/10.1039/c9cc02372kDOI Listing

Heavy-atom-free amorphous materials with facile preparation and efficient room-temperature phosphorescence emission.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, East China University of Science & Technology, 130 Meilong Road, Shanghai, 200237, China.

Amorphous pure organic room-temperature phosphorescent small molecules without heavy atoms, based on the intermolecular hydrogen bonding network for the immobilization of luminophores, were designed and facilely prepared via modification of heavy-atom-free luminophores onto β-cyclodextrin. Read More

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http://dx.doi.org/10.1039/c9cc01594aDOI Listing

Multiple functional groups in UiO-66 improve chemical warfare agent simulant degradation.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92023-0358, USA.

A library of 26 mixed ligand UiO-66 analogs was synthesized, characterized, and screened for catalytic degradation of the chemical warfare agent (CWA) simulant dimethyl 4-nitrophenylphosphate (DMNP). The MOFs were screened and compared to physical mixtures of the same single component MOFs. Several of the MOFs display higher catalytic activity than the parent UiO-66 and other single ligand UiO-66 analogues. Read More

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http://xlink.rsc.org/?DOI=C9CC02252J
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http://dx.doi.org/10.1039/c9cc02252jDOI Listing
April 2019
1 Read

Graphene oxide catalyzed ketone α-alkylation with alkenes: enhancement of graphene oxide activity by hydrogen bonding.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

College of Chemistry and Chemical Engineering and Key Laboratory of Auxiliary Chemistry and Technology for Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi'an 710021, China and Department of Chemistry, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA.

Direct α-alkylation of carbonyl compounds represents a fundamental bond forming transformation in organic synthesis. We report the first ketone-alkylation using olefins and alcohols as simple alkylating agents catalyzed by graphene oxide. Extensive studies of the graphene surface suggest a pathway involving dual activation of both coupling partners. Read More

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http://dx.doi.org/10.1039/c9cc02578bDOI Listing

Catalytic hydrazine disproportionation mediated by a thiolate-bridged VFe complex.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA.

A heterobimetallic VFe complex is demonstrated to catalyse hydrazine disproportionation with yields of up to 1073 equivalents of NH3 per catalyst, comparable to the highest turnover known for any molecular catalyst. Notably, the heterobimetallic complex is appreciably more active than monometallic analogues of the V and Fe sites, suggesting that bimetallic cooperativity may facilitate the observed catalysis. Read More

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http://xlink.rsc.org/?DOI=C9CC00345B
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http://dx.doi.org/10.1039/c9cc00345bDOI Listing
April 2019
2 Reads

Stable gold graphitic nanocapsule doped hydrogels for efficient photothermal antibacterial applications.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Molecular Science and Biomedicine Laboratory (MBL), State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan 410082, China.

Herein, we have fabricated gold nanorod graphitic nanocapsule (AuNR@G) doped poly(vinyl alcohol) (PVA)/chitosan (CS) hydrogels, which possessed highly efficient and stable photothermal antibacterial properties for both Gram-negative E. coli and Gram-positive S. aureus under the irradiation of a near-infrared laser. Read More

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http://dx.doi.org/10.1039/c9cc01933bDOI Listing
April 2019
1 Read

A rapidly self-assembling soft-brush DNA hydrogel based on RCA products.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China. and Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, P. R. China, Beijing, 100083, China.

A rapid self-assembly strategy was developed for fabricating a novel soft-brush DNA hydrogel in one minute by introducing a pair of L-type probes into the RCA products. The L-type probes with universality achieved a controllable size and morphology of the DNA hydrogel, providing deeper insight into variability and probability in functional biomaterials. Read More

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http://xlink.rsc.org/?DOI=C9CC01022J
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http://dx.doi.org/10.1039/c9cc01022jDOI Listing
April 2019
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Mapping aldehydic load in vivo by positron emission tomography with [F]NABF.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Dept. of Biology, University of Ottawa, Ottawa, Ontario, Canada. and Dept. of Chemistry & Biomolecular Sciences, University of Ottawa, Ottawa, Ontario, Canada and University of Ottawa Heart Institute, Ottawa, Ontario, Canada.

A new radiotracer, [18F]NA3BF3, capable of rapid, stable, and catalyst-free complexation of aldehydes in vivo is reported. [18F]NA3BF3 was shown to bind aldehydes in live subjects using locally administered aldehyde-presenting microparticles, and was then applied to mapping aldehydic load in a mouse model of sepsis. [18F]NA3BF3 may enable the direct investigation of the chemical biology of aldehydes in living subjects, and may open avenues for the adoption of endogenous aldehydic load as an imaging biomarker of inflammatory pathology. Read More

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http://xlink.rsc.org/?DOI=C9CC01831J
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http://dx.doi.org/10.1039/c9cc01831jDOI Listing
April 2019
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Visible-light-mediated guest trapping in a photosensitizing porous coordination network: metal-free C-C bond-forming modification of metal-organic frameworks for aqueous-phase herbicide adsorption.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Institute of Pesticide and Environmental Toxicology, Ministry of Agriculture Key Lab of Molecular Biology of Crop Pathogens and Insects, Zhejiang University, Hangzhou, 310058, P. R. China.

A series of furan/thiophene-derived Cr-MIL-101s were obtained via visible-light-mediated C-C bond-forming catalysis within photosensitizing porous materials. The guest trapping process was achieved under very mild and metal-free conditions, affording newly functionalized MOFs with more π-π stacking, hydrogen bonding properties and excellent adsorption capacity in removing herbicides from aquatic environments. Read More

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http://dx.doi.org/10.1039/c9cc01371gDOI Listing
April 2019
1 Read

Probing the photovoltaic properties of Ga-doped CdS-CuS core-shell heterostructured nanowire devices.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

National Nano Device Laboratories, Hsinchu 300, Taiwan.

In this study Ga-doped cadmium sulfide (CdS) nanowires (NWs) were grown through chemical vapor deposition. The carrier conductivities of the CdS NWs improved after the incorporation of Ga; moreover, the conductivities of the CdS NWs increased upon increasing the amount of the Ga source. Using a cation exchange method, these CdS NWs served as the source material for the preparation of Cu2S-CdS p-n heterostructured NWs. Read More

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http://dx.doi.org/10.1039/c8cc10316jDOI Listing

Supramolecular switching of the self-assembly of cyclic peptide-polymer conjugates via host-guest chemistry.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK. and Faculty of Pharmacy and Pharmaceutical Sciences, Monash University, 381 Royal Parade, Parkville, VIC 3052, Australia and Warwick Medical School, The University of Warwick, Coventry CV4 7AL, UK.

A supramolecular strategy of switching the self-assembly of cyclic peptide-polymer conjugates using host-guest chemistry is proposed. The formation of tubular supramolecular polymers based on cyclic peptide-polymer conjugates can be controlled by reversibly attaching cucurbit[7]uril onto the cyclic peptide via host-guest interactions. Read More

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http://dx.doi.org/10.1039/c9cc01914fDOI Listing

Nickel phthalocyanine as an excellent hole-transport material in inverted planar perovskite solar cells.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China. and Low-Dimensional Material and Device Laboratory, Tsinghua-Berkeley Shenzhen Institute, Tsinghua University, 1001 Xueyuan Road, Shenzhen 518055, China.

Pristine nickel phthalocyanine (NiPc) was introduced as a hole transporting material (HTM) in inverted planar perovskite solar cells (PSCs) for the first time. A power conversion efficiency of 14.3% was achieved, outperforming the values obtained in the solar cells based on the CuPc HTM, which is a typical representative of metal phthalocyanine based HTMs. Read More

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http://dx.doi.org/10.1039/c9cc01266dDOI Listing

Copper-catalyzed ring-opening C(sp)-N coupling of cycloketone oxime esters: access to 1°, 2° and 3° alkyl amines.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Department of Chemistry, Northeast Normal University, Changchun 130024, China. and Key Laboratory of Chemical Genomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen 518055, China.

A novel copper-catalyzed C(sp3)-N coupling of cycloketone oxime esters with nitrogen nucleophiles has been realized. All of the N-aryl/alkylanilines, anilines and benzophenone imine could be employed in this protocol to produce a variety of 1°, 2° and 3° alkyl amines in one or two steps. These resultant cyano-containing alkyl amines were proven to be versatile synthetic building blocks in a variety of chemical transformations. Read More

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http://dx.doi.org/10.1039/c9cc02030fDOI Listing
April 2019
1 Read

Efficient synthesis and enzymatic extension of an N-GlcNAz asparagine building block.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Leiden Institute of Chemistry (LIC), Division of Bio-Organic Chemistry, Einsteinweg 55, Leiden, The Netherlands.

N-Azidoacetyl-d-glucosamine (GlcNAz) is a particularly useful tool in chemical biology as the azide is a metabolically stable yet accessible handle within biological systems. Herein, we report a practical synthesis of FmocAsn(N-Ac3GlcNAz)OH, a building block for solid phase peptide synthesis (SPPS). Protecting group manipulations are minimised by taking advantage of the inherent chemoselectivity of phosphine-mediated azide reduction, and the resulting glycosyl amine is employed directly in the opening of Fmoc protected aspartic anhydride. Read More

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http://xlink.rsc.org/?DOI=C9CC02051A
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http://dx.doi.org/10.1039/c9cc02051aDOI Listing
April 2019
1 Read

Elucidating the mechanism of the structure-dependent enzymatic activity of Fe-N/C oxidase mimics.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Department of Materials Science, Key Laboratory of Automobile Materials of MOE and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People's Republic of China.

Herein, we develop an Fe-N/C-CNT nanomaterial with Fe-N3 units as a paradigm for excellent oxidase mimics by theoretical prediction and experimental implementation. The mechanism of the structure-dependent enzymatic activity is systematically investigated and elucidated from the perspective of the different configurations of M-Nx models (x = 0, 3, 4, and 5; M = Fe, Co, and Ni). Read More

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http://dx.doi.org/10.1039/c9cc01503eDOI Listing
April 2019
1 Read

Electrocatalytic N-to-NH conversion with high faradaic efficiency enabled using a Bi nanosheet array.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 610054, Sichuan, China. and Chemical Synthesis and Pollution Control, Key Laboratory of Sichuan Province, School of Chemistry and Chemical engineering, China West Normal University, Nanchong 637002, Sichuan, China.

Electrocatalytic N2 reduction represents a promising alternative to the conventional Haber-Bosch process for ambient N2-to-NH3 fixation, but it is severely challenged by competitive hydrogen evolution, which limits the current efficiency for NH3 formation. In this work, a nanosheet array of metallic Bi, an environmentally benign elemental substance previously predicted theoretically to have low hydrogen-evolving activity, is proposed as a superior catalyst for N2 reduction electrocatalysis. Electrochemical tests show that the Bi nanosheet array on Cu foil as a stable 3D catalyst electrode achieves a high faradaic efficiency of 10. Read More

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http://dx.doi.org/10.1039/c9cc01703hDOI Listing

Enantioselective iridium catalyzed α-alkylation of azlactones by a tandem asymmetric allylic alkylation/aza-Cope rearrangement.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

School of Chemical Engineering, Nanjing University of Science & Technology, Nanjing, 210094, China.

The development of an iridium catalyzed enantioselective α-alkylation of azlactones has been described. The reaction provides rapid access to a wide range of enantio-enriched quaternary carbon center allylated 2,4-diaryloxazol-5(2H)-ones in excellent yields with high enantioselectivities. The transformation was achieved through a tandem allylic alkylation/aza-Cope rearrangement, affording the desired products under mild conditions. Read More

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http://dx.doi.org/10.1039/c9cc01450kDOI Listing
April 2019
1 Read

A multifunctional persistent luminescent nanoprobe for imaging guided dual-stimulus responsive and triple-synergistic therapy of drug resistant tumor cells.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

State Key Laboratory of Food Science and Technology, Jiangnan University, Wuxi 214122, China. and International Joint Laboratory on Food Safety, Institute of Analytical Food Safety, School of Food Science and Technology, Jiangnan University, Wuxi 214122, China.

We report the design and fabrication of a multifunctional persistent luminescent nanoprobe for imaging guided dual-stimulus responsive and triple-synergistic therapy of drug resistant tumor. The integration of the dual-stimulus of an acidic microenvironment and laser irradiation with the triple-synergistic therapy of doxorubicin, photothermal and siRNA offers excellent therapeutic performance for drug resistant tumor cells with high specificity and little side effects. Read More

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http://dx.doi.org/10.1039/c9cc01446bDOI Listing

Photocontrolled endogenous reactive oxygen species (ROS) generation.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Department of Chemistry, Indian Institute of Science Education and Research Pune, Pune 411 008, Maharashtra, India.

A cell-permeable small molecule for light-triggered generation of endogenous reactive oxygen species (ROS) is reported. Read More

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http://dx.doi.org/10.1039/c9cc01747jDOI Listing

Iodine-doped sulfurized polyacrylonitrile with enhanced electrochemical performance for room-temperature sodium/potassium sulfur batteries.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

MITT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, Harbin Institute of Technology, Harbin 150001, China.

Iodine-doped sulfurized polyacrylonitrile (I-S@pPAN) is reported for room-temperature sodium sulfur (RT-Na/S) and potassium sulfur (RT-K/S) batteries operated in ester-based electrolytes. It delivers an unprecedented capacity of 994 mA h g-1 at 2C (3350 mA g-1) for the RT-Na/S battery, whilst a reversible capacity of 947 mA h g-1 at 0.1C for the RT-K/S battery. Read More

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http://dx.doi.org/10.1039/c9cc01612kDOI Listing

Dihalogen-bridged NHC-palladium(i) dimers: synthesis, characterisation and applications in cross-coupling reactions.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Evonik Chair of Organic Chemistry, Faculty of Chemistry and Biochemistry, Ruhr Universität Bochum, ZEMOS 2.27, Universitätsstr. 150, 44801 Bochum, Germany.

A di-iodo-bridged PdI dimer bearing an N-heterocyclic carbene ligand was made accessible via the reduction of [(IPr)PdI2]2 in basic methanol solution. The structural features of [(IPr)PdI]2 were explored by single-crystal X-ray analysis. It was found to be a convenient one-component precatalyst with high activity in Suzuki-Miyaura, Buchwald-Hartwig, and Sonogashira reactions. Read More

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http://dx.doi.org/10.1039/c9cc02239bDOI Listing
April 2019
1 Read

Light-activated "cycle-reversible intramolecular charge transfer" fluorescent probe: monitoring of pHi trace change induced by UV light in programmed cell death.

Chem Commun (Camb) 2019 Apr 17. Epub 2019 Apr 17.

Henan Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Key Laboratory of Green Chemical Media and Reactions, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, School of Chemistry and Chemical Engineering Institution, Henan Normal University, Xinxiang 453007, China.

Under the synergistic effects of protonation and deprotonation, a light-activated fluorescent probe (UV-SP) exhibited "cycle-reversible intramolecular charge transfer (ICT)" for different pH after activation by UV light, resulting in emission of multiple ratio fluorescent signals (FI563/FI595 and FI664/FI595). Based on these kinds of response signals, UV-SP can specifically monitor the cycle-reversible trace change of intracellular pH caused by UV radiation. More importantly, according to the stable and invariant multiple ratio fluorescent signals, UV-SP can sort cells entering programmed death. Read More

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http://dx.doi.org/10.1039/c9cc01451aDOI Listing

Superexchange in the fast lane - intramolecular electron transfer in a molecular triad occurs by conformationally gated superexchange.

Chem Commun (Camb) 2019 Apr 16. Epub 2019 Apr 16.

Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany and Department Functional Interfaces, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straβe 9, 07745 Jena, Germany. and Center for Energy and Environmental Chemistry Jena (CEEC Jena), Philosophenweg 7a, 07743 Jena, Germany.

Photoinduced electron transfer via hopping is generally considered to have a stronger temperature dependence than electron transfer via superexchange. However, in this work, an opposite trend of the temperature dependence is observed. This unexpected result is rationalized by considering the specific geometrical and electronic structure of the Ru-bis(terpyridine) photosensitizer. Read More

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http://xlink.rsc.org/?DOI=C9CC01886G
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http://dx.doi.org/10.1039/c9cc01886gDOI Listing
April 2019
1 Read

Design and photoisomerization dynamics of a new family of synthetic 2-stroke light driven molecular rotary motors.

Chem Commun (Camb) 2019 Apr 16. Epub 2019 Apr 16.

Department of Chemistry, Kyungpook National University, Daegu 702-701, South Korea.

A new family of light driven molecular rotary motors, which can be synthesized from easily available precursor compounds and which are capable of completing a full 360° revolution by two photoisomerization steps only, is proposed. The non-adiabatic molecular dynamic simulations show that the photoisomerization steps of the motor's working cycle occur on an ultrafast time scale (ca. 200-300 fs), have a very high quantum yield of isomerization (0. Read More

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http://dx.doi.org/10.1039/c9cc01955cDOI Listing
April 2019
1 Read

Covalently functionalized carbon nanoparticles with a chiral Mn-Salen: a new nanocatalyst for enantioselective epoxidation of alkenes.

Chem Commun (Camb) 2019 Apr 16. Epub 2019 Apr 16.

Department of Chemical Sciences, University of Catania, Viale Andrea Doria 6, 95125, Catania, Italy. and INSTM Udr of Catania, Viale Andrea Doria 6, 95125, Catania, Italy.

A new protocol to obtain carbon nanoparticles (CNPs) covalently functionalized with a chiral Mn-Salen catalyst is described here. The new nanocatalyst (CNPs-Mn-Salen) was tested in the enantioselective epoxidation of some representative alkenes (CN-chromene, 1,2-dihydronaphthalene and cis-β-ethyl styrene), obtaining better enantiomeric excess values than that of the catalyst single molecule, highlighting the role of the nanostructure in the enantioselectivity. Read More

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http://dx.doi.org/10.1039/c9cc01825eDOI Listing
April 2019
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Hydrogen atom transfer from 1,2- and 1,3-diols to the cumyloxyl radical. The role of structural effects on metal-ion induced C-H bond deactivation.

Chem Commun (Camb) 2019 Apr 16. Epub 2019 Apr 16.

Dipartimento di Scienze e Tecnologie Chimiche, Università "Tor Vergata", Via della Ricerca Scientifica, 1, I-00133 Rome, Italy.

Strong C-H bond deactivation toward HAT has been observed in the reactions of the cumyloxyl radical with 1,2- and 1,3-diols, following addition of Li+ and Ca2+. Weaker effects have been observed with Mg2+. The role of the substrate structure and of the metal ion in the formation of Lewis acid-base complexes is discussed. Read More

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http://dx.doi.org/10.1039/c9cc01879dDOI Listing
April 2019
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A two-dimensional crystal formed by pentamers on Au(111).

Chem Commun (Camb) 2019 Apr 16. Epub 2019 Apr 16.

Key Laboratory for the Physics and Chemistry of Nanodevices, Department of Electronics, Peking University, Beijing 100871, China. and Beijing Academy of Quantum Information Sciences, Beijing 100193, China.

A new type of two-dimensional crystal comprising supramolecular pentamers on Au(111) is studied using an ultra-high vacuum low-temperature scanning tunnelling microscope. (2E,4E)-3-Methyl-5-(2,6,6-trimethylcyclohex-1-enyl)penta-2,4-dienoic acid molecules form pentamers through five-fold OH-O hydrogen bonds. In ordered arrays, pentamers interact with each other via van der Waals interactions. Read More

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http://dx.doi.org/10.1039/c9cc01658aDOI Listing
April 2019
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Size-controlled DNA-cross-linked hydrogel coated silica nanoparticles served as a ratiometric fluorescent probe for the detection of adenosine triphosphate in living cells.

Chem Commun (Camb) 2019 Apr 16. Epub 2019 Apr 16.

Key Laboratory of Optic-electric Sensing and Analytical Chemistry for Life Science, Ministry of Education, Shandong Key Laboratory of Biochemical Analysis, Key Laboratory of Analytical Chemistry for Life Science in Universities of Shandong, College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Qingdao 266042, P. R. China.

Herein, we have designed a ratiometric fluorescent nanoprobe for adenosine triphosphate sensing and imaging in living cells, based on silica nanoparticles and a DNA-functionalized hybrid hydrogel. This ratiometric detecting method could validly avoid false-positive signals. Due to its controllable size, favorable biocompatibility and biostability, the nanohydrogel exhibited high cellular permeability and fast response in living cells. Read More

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http://dx.doi.org/10.1039/c9cc01832hDOI Listing

A 'sulfonyl-azide-free' (SAFE) aqueous-phase diazo transfer reaction for parallel and diversity-oriented synthesis.

Chem Commun (Camb) 2019 Apr 15. Epub 2019 Apr 15.

Institute of Chemistry, Saint Petersburg State University, Saint Petersburg 199034, Russian Federation.

Diazo transfer reactions are notoriously associated with the use of potentially explosive sulfonyl azides. The first 'sulfonyl-azide-free' (SAFE) protocol for producing diazo compounds from their active-methylene precursors via the Regitz diazo transfer reaction was developed and has displayed a remarkable substrate scope. It can be applied to generating arrays of diazo compounds for further evolution via combinatorial chemistry and a range of scaffold-generating transformations. Read More

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http://dx.doi.org/10.1039/c9cc02042jDOI Listing

Synthesis and controllable self-assembly of 3D amphiphilic organoplatinum(ii) metallacages in water.

Chem Commun (Camb) 2019 Apr 15. Epub 2019 Apr 15.

College of Chemistry and Chemical Engineer, Nantong University, Nantong, Jiangsu 226019, P. R. China.

An amphiphilic metallacage with tetragonal prismatic frameworks as a hydrophobic core and pendent tri(ethylene glycol) chains as hydrophilic tails was prepared successfully and showed controllable self-assembly behaviour in water. Read More

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http://dx.doi.org/10.1039/c9cc02173fDOI Listing

Modular design of nanobody-drug conjugates for targeted-delivery of platinum anticancer drugs with an MRI contrast agent.

Chem Commun (Camb) 2019 Apr 15. Epub 2019 Apr 15.

CAS Key Laboratory of Soft Matter Chemistry, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, China.

A multifunctional nanobody-drug conjugate (NDC) was constructed in this work for the targeted delivery of a platinum prodrug and an MRI contrast agent. The NDC can be specifically internalized into EGFR positive cancer cells, resulting in higher therapeutic effect and lower side-effects relative to cisplatin. The Gd-binding domain enables the in situ detection of the drug distribution in vivo. Read More

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http://dx.doi.org/10.1039/c9cc01391aDOI Listing
April 2019
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Dynamic protein hydrogels with reversibly tunable stiffness regulate human lung fibroblast spreading reversibly.

Chem Commun (Camb) 2019 Apr 15. Epub 2019 Apr 15.

Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada.

We report the engineering of a protein-based dynamic hydrogel that can be reversibly tuned between stiff and soft states via a redox reaction. When cultured on this hydrogel surface, human lung fibroblasts can dynamically and reversibly change their morphology in response to changes in hydrogel stiffness. Read More

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http://dx.doi.org/10.1039/c9cc01276aDOI Listing
April 2019
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Developing chemically modified redox-responsive proteins as smart therapeutics.

Chem Commun (Camb) 2019 Apr 15. Epub 2019 Apr 15.

Beijing National Laboratory for Molecular Science, CAS Research/Education Center for Excellence in Molecule Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, the Chinese Academy of Sciences (CAS), Beijing 100190, China. and University of Chinese Academy of Sciences, Beijing 100190, China.

The conditional control of protein function in response to the physiological changes of diseased cells is essential to develop smart protein therapeutics. Herein, we report a redox-responsive chemical modification of a protein by conjugating an intracellular glutathione (GSH)-cleavable ligand, NSA, onto a protein residue. We demonstrated that the NSA conjugation of Ribonuclease A (RNase A) enabled the control of the protein function by GSH in an aqueous solution and living cells, with extended applications for targeted cancer therapy using a lipid nanoparticle-based intracellular protein delivery strategy. Read More

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http://xlink.rsc.org/?DOI=C9CC00519F
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http://dx.doi.org/10.1039/c9cc00519fDOI Listing
April 2019
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Strong CPL of achiral AIE-active dyes induced by supramolecular self-assembly in chiral nematic liquid crystals (AIE-N*-LCs).

Chem Commun (Camb) 2019 Apr 15. Epub 2019 Apr 15.

Key Lab of Mesoscopic Chemistry of MOE and Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China.

Chiral binaphthyl enantiomers (Guest 1) were doped into commercial nematic liquid crystals (N-LCs, Host E7) to form chiral nematic liquid crystals (N*-LCs). The new ternary AIE-N*-LCs prepared by introducing four achiral AIE dyes (Guest 2) into N*-LCs can give rise to strong CPL responses with high luminescence dissymmetry factor (gem) values of up to1.42. Read More

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http://xlink.rsc.org/?DOI=C9CC01678C
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http://dx.doi.org/10.1039/c9cc01678cDOI Listing
April 2019
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Organocatalytic enantioselective direct alkylation of phloroglucinol derivatives: asymmetric total synthesis of (+)-aflatoxin B.

Chem Commun (Camb) 2019 Apr 15. Epub 2019 Apr 15.

School of Pharmaceutical Sciences, Key Laboratory of Bioorganic Phosphorus, Chemistry & Chemical Biology (Ministry of Education), Beijing Frontier Research, Center for biological Structure, Tsinghua University, Beijing 100084, China.

The organocatalytic enantioselective Friedel-Crafts alkylation of phloroglucinol derivatives with enals is reported, providing general access to the benzylic chiral centers shown in a variety of phloroglucinol natural products. The synthetic utility is demonstrated by the very concise asymmetric total synthesis of aflatoxins B2. Read More

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http://dx.doi.org/10.1039/c9cc01833fDOI Listing

Target-controlled liposome amplification for versatile nanopore analysis.

Chem Commun (Camb) 2019 Apr 15. Epub 2019 Apr 15.

Key Laboratory of Synthetic and Natural Functional Molecular Chemistry, College of Chemistry & Materials Science, Northwest University, Xi'an 710069, P. R. China.

We have reported a versatile nanopore method based on the combination of analyte-controlled liposome signal amplification and the nanopore detection of a reporter molecule, which largely extends the nanopore application range, and easily elevates the nanopore sensitivity to the fM level from the μM level. Read More

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http://dx.doi.org/10.1039/c9cc00285eDOI Listing
April 2019
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A supramolecular network derived by rotaxane tethering three ureido pyrimidinone groups.

Chem Commun (Camb) 2019 Apr 15. Epub 2019 Apr 15.

Department of Chemical Science and Engineering, Tokyo Institute of Technology, 2-12-1 (H-126) O-okayama, Meguro-ku, Tokyo 152-8552, Japan.

A supramolecular network and its film were prepared via intermolecular hydrogen bonding of a [2]rotaxane with three ureido pyrimidinone groups. Adding less polar solvents such as CHCl3 to the rotaxane afforded a swollen rotaxane-cross-linked network. The properties of the film obtained by drying were evaluated to characterize it. Read More

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http://xlink.rsc.org/?DOI=C9CC01660K
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http://dx.doi.org/10.1039/c9cc01660kDOI Listing
April 2019
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Electron-pair bonding in real space. Is the charge-shift family supported?

Chem Commun (Camb) 2019 Apr 12. Epub 2019 Apr 12.

Departamento de Química Física y Analítica, Universidad de Oviedo, Oviedo, Spain.

Charge-shift bonding (CSB) has been introduced as a distinct third family of electron-pair links that adds to the covalent and ionic tradition. However, the full battery of orbital invariant tools provided by modern real space artillery shows that it is difficult to find CSB signatures outside the original valence-bond framework in which CSB was developed. The CSB concept should therefore be further investigated. Read More

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http://xlink.rsc.org/?DOI=C9CC02123J
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http://dx.doi.org/10.1039/c9cc02123jDOI Listing
April 2019
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ABaSbQ (A = Li, Na; Q = S, Se): diverse arrangement modes of isolated SbQ ligands regulating the magnitudes of birefringences.

Chem Commun (Camb) 2019 Apr 12. Epub 2019 Apr 12.

CAS Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, CAS, Xinjiang Key Laboratory of Electronic Information Materials and Devices, 40-1 South Beijing Road, Urumqi 830011, China.

A new series of ABaSbQ3 compounds (A = Li, Na; Q = S, Se) featuring isolated SbQ3 ligands with different arrangement modes was synthesized. The structural transformations (monoclinic to orthorhombic) in the known A-MII-Sb-Q3 system showing an intimate relationship with the differences (Δd = LIIM-Q - LA-Q) were systematically investigated for the first time. Remarkably, the diverse arrangement modes of the isolated SbQ3 ligands have also proven effective at regulating the optical anisotropy based on first principles calculation. Read More

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http://dx.doi.org/10.1039/c9cc00560aDOI Listing

Role of hydrophobic residues for the gaseous formation of helical motifs.

Chem Commun (Camb) 2019 Apr 12. Epub 2019 Apr 12.

College of Chemistry, Fuzhou University, 350002 Fuzhou, China.

The secondary structure content of proteins and their complexes may change significantly on passing from aqueous solution to the gas phase (as in mass spectrometry experiments). In this work, we investigate the impact of hydrophobic residues on the formation of the secondary structure of a real protein complex in the gas phase. We focus on a well-studied protein complex, the amyloid-β (1-40) dimer (2Aβ). Read More

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http://xlink.rsc.org/?DOI=C9CC01898K
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http://dx.doi.org/10.1039/c9cc01898kDOI Listing
April 2019
2 Reads