344,173 results match your criteria Organic & biomolecular chemistry[Journal]


Ultrafast Vibrational Cooling Inside a Molecular Container.

J Phys Chem Lett 2019 Apr 24. Epub 2019 Apr 24.

Vibrational cooling of azulene encapsulated in a hemicarcerand molecular container was studied by pump-probe spectroscopy. Within 1.5 ps of excitation of azulene to the S1 state, rapid internal conversion through a conical intersection leads to the formation of vibrationally hot (~1080 K) ground state, the subsequent cooling of which can be monitored by tracking the evolution of the red shifted hot band at the edge of the ground state absorption. Read More

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http://dx.doi.org/10.1021/acs.jpclett.9b00406DOI Listing

Enhancement of Photocatalytic Activity of Bi O -BiOI Composite Nanosheets through Vacancy Engineering.

Small 2019 Apr 24:e1900020. Epub 2019 Apr 24.

Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University, Tianjin, 300071, P. R. China.

Vacancy engineering is an effective strategy to enhance solar-driven photocatalytic performance of semiconductors. It is highly desirable to improve the photocatalytic performance of composite nanomaterials by the introduction of vacancies, but the role of vacancies and the heterostructure in the photocatalytic process is elusive to the composite nanomaterials. Herein, the introduction of I vacancies can significantly enhance the photocatalytic activity of Bi O -BiOI composite nanosheets in a synergistic manner. Read More

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http://dx.doi.org/10.1002/smll.201900020DOI Listing

Phytochemical analysis of Vietnamese propolis produced by the stingless bee Lisotrigona cacciae.

PLoS One 2019 24;14(4):e0216074. Epub 2019 Apr 24.

Institute of Organic Chemistry with Centre of Phytochemistry, Bulgarian Academy of Sciences, Sofia, Bulgaria.

Propolis produced by the stingless bee Lisotrigona cacciae was studied for the first time. Using different chromatographic procedures, a total of eighteen constituents (phenols and triterpenes) were isolated, among which flavane 1, homoisoflavanes 2-4, and xanthones 5 and 6 were new for propolis. Propolis extract was also characterized by gas chromatography/mass spectrometry and other fifteen constituents were identified. Read More

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http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0216074PLOS

Photoinduced Intercomponent Processes in Selectively Addressable Bichromophoric Dyads Made of Linearly Arranged Ru(II) Terpyridine and Expanded Pyridinium Components.

Inorg Chem 2019 Apr 24. Epub 2019 Apr 24.

Univ Paris Diderot , Sorbonne Paris Cité, ITODYS, UMR CNRS 7086 , 15 rue J-A de Baïf , 75013 Paris , France.

Three new linearly arranged bichromophoric systems 1-3 have been prepared, and their photophysical properties have been studied, taking also advantage of femtosecond pump-probe transient absorption spectroscopy. The three compounds contain the same chromophores, that is a Ru(II)-terpy-like species and a fused expanded bipyridinium (FEBP) unit, separated by three different, variously methylated biphenylene-type bridges. The chromophores have been selected to be selectively addressable, and excitation involving the Ru-based or the FEBP-based dyes results in different excited-state decays. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.9b00139DOI Listing

Plasmonic Metal Nanoparticles with Core-Bishell Structure for High-Performance Organic and Perovskite Solar Cells.

ACS Nano 2019 Apr 24. Epub 2019 Apr 24.

To maximize light coupling into the active layer, plasmonic nanostructures have been incorporated into both activelayers of organic solar cells (OSCs) and perovskite solar cells (PSCs) with the aim of increasing light absorption, but reports have shown controversial results in electrical characteristics. In this work, we introduce a core-bishell concept to build plasmonic nanoparticles (NPs) with metal-inorganic semiconductor-organic semiconductor nanostructure. Specifically, Ag NPs were decorated with titania/benzoic-acid-fullerene bishell (Ag@TiO2@Pa), which enables the NPs possess nature compatibility with fullerene acceptors or perovskite absorber. Read More

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http://dx.doi.org/10.1021/acsnano.9b00135DOI Listing
April 2019
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From Molecular and Emulsified Ion Sensors to Membrane Electrodes: Molecular and Mechanistic Sensor Design.

Acc Chem Res 2019 Apr 24. Epub 2019 Apr 24.

University of Geneva , Department of Inorganic and Analytical Chemistry , Quai Ernest Ansermet 30 , Geneva 1211 , Switzerland.

Selective molecular ion probes are often insoluble in water and require a hydrophobic solvent environment for strong and selective binding, which runs counter to the desire of utilizing them in a homogeneous solution. This Account aims to guide the reader on how such molecules, often coined ionophores, can be harnessed to design exceptionally useful optical and electrochemical sensors. We start here with some historical context on the design of such ionophores and continue with the explanation of the response mechanism of optical and potentiometric sensors and the role of combined components to build a robust ion sensor. Read More

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http://dx.doi.org/10.1021/acs.accounts.9b00056DOI Listing
April 2019
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Enantiomeric resolution, thermodynamic parameters, and modeling of clausenamidone and neoclausenamidone on polysaccharide-based chiral stationary phases.

Chirality 2019 Apr 24. Epub 2019 Apr 24.

College of Pharmacy, Guangdong Pharmaceutical University, Guangzhou City, Guangdong Province, People's Republic of China.

The aim of the paper is to describe a new synthesis route to obtain synthetic optically active clausenamidone and neoclausenamidone and then use high-performance liquid chromatography (HPLC) to determine the optical purities of these isomers. In the process, we investigated the different chromatographic conditions so as to provide the best separation method. At the same time, a thermodynamic study and molecular simulations were also carried out to validate the experimental results; a brief probe into the separation mechanism was also performed. Read More

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http://dx.doi.org/10.1002/chir.23068DOI Listing

O- excess as a detector for co-extracted organics in vapor analyses of plant isotope signatures.

Rapid Commun Mass Spectrom 2019 Apr 24. Epub 2019 Apr 24.

Global Institute for Water Security, School of Environment and Sustainability, University of Saskatchewan, 11 Innovation Boulevard, Saskatoon, SK, S7N 3H5, Canada.

Rationale: The stable isotope compositions of hydrogen and oxygen in water (δ H and δ O values) have been widely used to investigate plant water sources, but traditional isotopic measurements of plant waters are expensive and labor intensive. Recent work with direct vapor equilibration (DVE) on laser spectroscopy has shown potential to sidestep limitations imposed by traditional methods. Here, we evaluate DVE analysis of plants with a focus on spectral contamination introduced by organic compounds. Read More

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http://dx.doi.org/10.1002/rcm.8470DOI Listing

Systematic experimental study on quantum sieving of hydrogen isotopes in metal-amide-imidazolate frameworks with narrow 1-D channels.

Chemphyschem 2019 Apr 24. Epub 2019 Apr 24.

Max-Planck-Institut fur Intelligente Systeme, Max-Planck-Institut für Intelligente Systeme, Heisenbergstr. 3, 70569, Stuttgart, GERMANY.

Quantum sieving of hydrogen isotopes is experimentally studied in isostructural hexagonal metal-organic frameworks having 1-D channels, named IFP-1, -3, -4 and -7. Inside the channels different molecules or atoms restrict the channel diameter periodically with apertures larger (4.2 Å for IFP-1, 3. Read More

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http://dx.doi.org/10.1002/cphc.201900183DOI Listing

Mitochondria Targeting Fluorescent Probes Based on Through Bond Energy Transfer for Mutually Imaging Signaling Molecules H2S and H2O2.

Chemistry 2019 Apr 24. Epub 2019 Apr 24.

Nanjing University, Department of Polymer Science & Engineering, School of Chemistry & Chemical Engineering, No. 163 Xianlin Avenue, Qixia District, 210046, Nanjing, CHINA.

Reactive signaling molecules participate in varieties of biochemical reactions, and methods to detect their mutual existence and crosstalk are in urgent demand. We first designed a benzothiadiazole-based handle that fluorescently responds to the co-existence of H2S and H2O2 under pseudo-physiological conditions, and demonstrated a thiyl radical-mediated mechanism that accounts for the rapid and efficient domino-like reaction processes. Then we mounted the handle motif to a rhodamine moiety via an ethynylene linkage, and achieved a significant H2S-H2O2 mutual response in the mitochondria of living cells. Read More

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http://dx.doi.org/10.1002/chem.201900959DOI Listing

Ditocopheryl sulfides and disulfides: Synthesis and antioxidant profile.

Chemistry 2019 Apr 24. Epub 2019 Apr 24.

ITALY.

Symmetrical ditocopheryl disulfides (Toc)2S2 and symmetrical and unsymmetrical ditocopheryl sulfides (Toc)2S were simply prepared under remarkably mild conditions with complete control of the regiochemistry using delta-, gamma-, and beta-tocopheryl-N-thiophthalimides (Toc-NSPht) as common starting materials. The role of the sulfur atom(s), H-bond and aryl ring substitution pattern on the antioxidant profile of these new compounds, assembled linking together two tocopheryl units, are also discussed. Read More

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http://dx.doi.org/10.1002/chem.201901537DOI Listing

Simultaneous Analysis of Multiclass Contaminants of Emerging Concern in Sediments by Liquid Chromatography with Tandem Quadrupole Mass Spectrometry.

Environ Toxicol Chem 2019 Apr 24. Epub 2019 Apr 24.

CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China.

A QuEChERS based extraction and simultaneous dispersive solid phase extraction (dSPE) cleanup method was developed for contaminants of emerging concerns (CECs) in sediment samples. Hydration with phosphate buffer (pH 2.0) and salting out with NaCl and MgSO facilitated the extraction and liquid-liquid portioning of the aqueous and organic phases. Read More

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http://dx.doi.org/10.1002/etc.4450DOI Listing
April 2019
3.225 Impact Factor

Phase transitions in (C H N ) [SnCl ]Cl ·1.5H O crystal, studied by NMR and infrared spectroscopy.

Magn Reson Chem 2019 Apr 24. Epub 2019 Apr 24.

Laboratory of spectroscopic characterization and optics of materials, BP1171, 3018, Sfax, Tunisia.

The (C H N ) [SnCl ]Cl ·1.5H O complex is a new member of the family of hybrid organic-inorganic perovskite compounds. It exhibits two order-disorder phase transitions with changes in the conformation of aromatic cations at the two transition temperatures 360K and 412K. Read More

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http://dx.doi.org/10.1002/mrc.4878DOI Listing

An efficient light on-off one-pot method for the synthesis of 3-styryl coumarins from aryl alkynoates.

Org Biomol Chem 2019 Apr 24. Epub 2019 Apr 24.

College of Chemistry and Molecular Engineering, Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities, Zhengzhou University, Zhengzhou 450052, P.R. China.

An efficient one-pot stepwise method to synthesize 3-styryl-4-arylcoumarins from simple alkynoates is demonstrated. On the basis of the control experiments, a possible mechanism involving light-driven radical cyclization and Pd-catalysed cross-coupling processes for this synthesis method is proposed. The results of X-ray analysis and spectroscopy experiments prove that the substituent effect has a significant influence on the absorption and emission properties of the synthesized 3-styryl coumarins. Read More

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http://dx.doi.org/10.1039/c9ob00421aDOI Listing

Evaluation of droplet-based microfluidic platforms as a convenient tool for lipases and esterases assays.

Prep Biochem Biotechnol 2019 Apr 24:1-8. Epub 2019 Apr 24.

a Institute of Physical Chemistry , PAS , Warsaw , Poland.

The accurate estimation of kinetic parameters is of fundamental importance for biochemical studies for research and industry. In this paper, we demonstrate the application of a modular microfluidic system for execution of enzyme assays that allow determining the kinetic parameters of the enzymatic reactions such as V - the maximum rate of reaction and K - the Michaelis constant. For experiments, the fluorogenic carbonate as a probe for a rapid determination of the kinetic parameters of hydrolases, such as lipases and esterases, was used. Read More

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http://dx.doi.org/10.1080/10826068.2019.1605527DOI Listing

Pd/C-Catalyzed Carbonylative Synthesis of 2-Aminobenzoxazinones from 2-Iodoaryl Azides and Amines.

Org Lett 2019 Apr 24. Epub 2019 Apr 24.

Leibniz-Institut für Katalyse e.V. an der Universität Rostock , Albert-Einstein-Straße 29a , 18059 Rostock , Germany.

A palladium-catalyzed carbonylative procedure for the synthesis of 2-aminobenzoxazinones from 1-azido-2-iodobenzenes and amines has been developed. A broad range of 2-aminobenzoxazinone derivatives were prepared in moderate to excellent yields by using Pd/C as the catalyst under CO atmosphere. Notably, by using organic azides as the substrates, external oxidant usage can be successfully avoided and only forms N as the byproduct. Read More

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http://dx.doi.org/10.1021/acs.orglett.9b00966DOI Listing

A Direct-Bandgap 2D Silver-Bismuth Iodide Double Perovskite: The Structure-Directing Influence of an Oligothiophene Spacer Cation.

J Am Chem Soc 2019 Apr 23. Epub 2019 Apr 23.

Three-dimensional (3D) hybrid organic-inorganic lead halide perovskites (HOIPs) feature remarkable optoelectronic properties for solar energy conversion but suffer from long-standing issues of environmental stability and lead-toxicity. Associated two-dimensional (2D) analogs are garnering increasing interest due to superior chemical stability, structural diversity and broader property tunability. Towards lead-free 2D HOIPs, double perovskites (DPs) with mixed valent dual metals are attractive but remain unexplored beyond a recent 2D Ag-Bi bromide DP with n-butylammonium spacer cations. Read More

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http://dx.doi.org/10.1021/jacs.9b02909DOI Listing

Kinetic Control of Interpenetration in Fe-Biphenyl-4,4'-Dicarboxylate Metal-Organic Frameworks by Coordination and Oxidation Modulation.

J Am Chem Soc 2019 Apr 24. Epub 2019 Apr 24.

Phase control in the self-assembly of metal-organic frameworks (MOFs) is often a case of trial and error; judicious control over a number of synthetic variables is required to select the desired topology and control features such as interpenetration and defectivity. Herein, we present a comprehensive investigation of self-assembly in the Fe-biphenyl-4,4'-dicarboxylate system, demonstrating that coordination modulation can reliably tune between the kinetic product, non-interpenetrated MIL-88D(Fe), and the thermodynamic product, two-fold interpenetrated MIL-126(Fe). Density functional theory simulations reveal that correlated disorder of the terminal anions on the metal clusters results in hydrogen-bonding between adjacent nets in the interpenetrated phase and is the thermodynamic driving force for its formation. Read More

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http://dx.doi.org/10.1021/jacs.9b03269DOI Listing

14.7% Efficiency Organic Photovoltaic Cells Enabled by Active Materials with a Large Electrostatic Potential Difference.

J Am Chem Soc 2019 Apr 22. Epub 2019 Apr 22.

Although significant improvements have been achieved for organic photovoltaic cells (OPVs), the top-performing devices still show far behind power conversion efficiencies than the commercialized solar cells. One of the main reasons is the large driving force required for separating electron-hole pairs. Here, we demonstrate an efficiency of 14. Read More

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http://dx.doi.org/10.1021/jacs.8b12937DOI Listing

Self-Assembly of Anionic Polyoxometalate-Organic Architectures Based on Lacunary Phosphomolybdates and Pyridyl Ligands.

J Am Chem Soc 2019 Apr 23. Epub 2019 Apr 23.

Department of Applied Chemistry, School of Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku, Tokyo 113-8656 , Japan.

The development of novel systems for metal-organic architectures is an attractive research field because they are fascinating materials with unexplored functions. Lacunary polyoxometalates (POMs) offer structurally well-defined coordination sites with various coordination directions and numbers in addition to the designable properties; thus, lacunary POMs are ideal building blocks for inorganic-organic architectures. However, their utilization is currently limited by their low stability and difficulty in controlling the reactivity. Read More

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http://dx.doi.org/10.1021/jacs.9b02541DOI Listing

Metal-Organic Framework Nanoparticle-Assisted Cryopreservation of Red Blood Cells.

J Am Chem Soc 2019 Apr 23. Epub 2019 Apr 23.

The development of hybrid nanomaterials mimicking antifreeze proteins that can modulate/inhibit the growth of ice crystals for cell/tissue cryopreservation has attracted increasing interests. Herein, we describe the first utilization of zirconium (Zr)-based metal-organic framework (MOF) nanoparticles (NPs) with well-defined surface chemistries for the cryopreservation of red blood cells (RBCs) without the need of any (toxic) organic solvents. Distinguishing features of this cryoprotective approach include the exceptional water stability, low hemolytic activity, and the long periodic arrangement of organic linkers on the surface of MOF NPs which provide the precise spacing of hydrogen donors to recognize and match the ice crystal planes. Read More

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http://pubs.acs.org/doi/10.1021/jacs.9b00992
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http://dx.doi.org/10.1021/jacs.9b00992DOI Listing
April 2019
1 Read

Pore Space Partitioning of Metal-Organic Framework for CH Separation from Methane.

Inorg Chem 2019 Apr 24. Epub 2019 Apr 24.

School of Materials Science and Chemical Engineering , Ningbo University , Ningbo 315211 , China.

To develop efficient adsorbent materials for CH separation from methane, herein, we design a new 3-D framework (NbU-5) using the pore space partition strategy: Zn(OCR) paddlewheel units connect tetra-carboxylic linkers to build a primary framework, and 4,4-bipyridine, which acts as a pore-partitioning agent, has been successfully inserted into the cage of the primary framework. Remarkably, NbU-5 exhibits excellent CH/CH and CH/CH selectivity, which is proved by breakthrough experiments. Read More

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http://dx.doi.org/10.1021/acs.inorgchem.9b00550DOI Listing

Porous Crystalline Olefin-Linked Covalent Organic Frameworks.

J Am Chem Soc 2019 Apr 23. Epub 2019 Apr 23.

Department of Chemistry , University of California-Berkeley ; Materials Sciences Division, Lawrence Berkeley National Laboratory; and Kavli Energy NanoSciences Institute, Berkeley , California 94720 , United States.

The first unsubstituted olefin-linked covalent organic framework, termed COF-701, was made by linking 2,4,6-trimethyl-1,3,5-triazine (TMT) and 4,4'-biphenyldicarbaldehyde (BPDA) through Aldol condensation. Formation of the unsubstituted olefin (-CH═CH-) linkage upon reticulation is confirmed by Fourier transform infrared (FT-IR) spectroscopy and solid-state C cross-polarization magic angle spinning (CP-MAS) NMR spectroscopy of the framework and of its C-isotope-labeled analogue. COF-701 is found to be porous (1715 m g) and to retain its composition and crystallinity under both strongly acidic and basic conditions. Read More

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http://dx.doi.org/10.1021/jacs.9b02848DOI Listing

Inducing Disorder in Order: Hierarchically Porous Covalent Organic Framework Nanostructures for Rapid Removal of Persistent Organic Pollutants.

J Am Chem Soc 2019 Apr 21. Epub 2019 Apr 21.

The key factor responsible for fast diffusion and mass transfer through a porous material is the availability of a widely open pore-interior having complete accessibility from their surface. But, due to their highly stacked nature, ordered two dimen-sional (2D) materials fail to find real-world applicability, as it is difficult to take advantage of their complete structure, espe-cially the inner cores. In this regard, three dimensional (3D) nano-structures constructed from layered two dimensional crys-tallites could prove advantageous. Read More

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http://dx.doi.org/10.1021/jacs.9b02706DOI Listing

Effective delivery of mitomycin-C and meloxicam by double-layer electrospun membranes for the prevention of epidural adhesions.

J Biomed Mater Res B Appl Biomater 2019 Apr 24. Epub 2019 Apr 24.

Beijing Laboratory of Biomedical Materials, State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing, China.

Epidural adhesion between the spinal dura and the surrounding fibrous tissue often occurs post-laminectomy, resulting in clinical symptoms such as nerve compression and severe pain. In this study, we report a drug-loaded double-layered electrospun nanofiber membrane to prevent the occurrence of epidural adhesion. The nanofibers in both layers are made of a mixture of polycaprolactone (PCL) and chitosan (CS) but at different weight ratios. Read More

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http://dx.doi.org/10.1002/jbm.b.34394DOI Listing

Edaphic macrofauna in degradation of animal and vegetable residues.

Braz J Biol 2019 Oct-Dec;79(4):589-593. Epub 2019 Apr 18.

Laboratório de Biologia de Solos - LBS, Departamento de Solos, Faculdade de Agronomia Eliseu Maciel - FAEM, Universidade Federal de Pelotas - UFPel, Campus Universitário, s/n, CEP 96160-000, Capão do Leão, RS, Brasil.

The objective of this study was to evaluate the ability to degrade organic matter by edaphic macrofauna (worms), carbon/nitrogen (C/N) ratio and hydrogenation potential (pH) during the vermicomposting process in different organic residues. The treatments were constituted by organic residues of animal origin (bovine, ovine and equine manure) and vegetable (herb-checkmate and coffee drag), which were conditioned in plastic pots with a capacity of 10 liters, comprising five treatments in a completely randomized experimental design, with five replications. Were inoculated 150 earthworms of the species Eisenia foetida, into each plot. Read More

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http://dx.doi.org/10.1590/1519-6984.184765DOI Listing

Modulating bioactivities of primary ammonium-tagged antimicrobial aliphatic polycarbonates by varying length, sequence and hydrophobic side chain structure.

Biomater Sci 2019 Apr 24. Epub 2019 Apr 24.

Graduate School of Science and Engineering, Yamagata University, Japan.

Cationic aliphatic polycarbonates bearing primary ammonium side chains have been developed with relatively high molecular weights and controlled macromolecular architectures. These polycarbonates exhibit reasonable antimicrobial activity against Gram-negative and Gram-positive bacteria. The prepared homopolymers could be effective against Gram-negative bacteria whose growth is usually inhibited by copolymers with hydrophobic comonomer units when quaternary ammonium salts (QAS) are used at the cationic side chains. Read More

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http://dx.doi.org/10.1039/c9bm00440hDOI Listing

The impact of an isoreticular expansion strategy on the performance of iodine catalysts supported in multivariate zirconium and aluminum metal-organic frameworks.

Dalton Trans 2019 Apr 24. Epub 2019 Apr 24.

Department of Chemistry and Biochemistry, Texas Tech University, Box 1061, Lubbock, Texas 79409-1061, USA.

Iodine functionalized variants of DUT-5 (Al) and UiO-67 (Zr) were prepared as expanded-pore analogues of MIL-53 (Al) and UiO-67 (Zr). They were prepared using a combination of multivariate and isorecticular expansion strategies. Multivariate MOFs with a 25% iodine-containing linker was chosen to achieve an ideal balance between a high density of catalytic sites and sufficient space for efficient diffusion. Read More

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http://dx.doi.org/10.1039/c9dt00368aDOI Listing

Correction: Isopolymolybdate-based inorganic-organic hybrid compounds constructed by multidentate N-donor ligands: syntheses, structures and properties.

Dalton Trans 2019 Apr 24. Epub 2019 Apr 24.

College of Biological, Chemical Science and Engineering, Jiaxing University, Jiaxing 314001, P. R. China. and State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, P. R. China and Guangdong Provincial Laboratory of Chemistry & Fine Chemical Engineering (Shantou), Guangdong Technion-Israel Institute of Technology (GTIIT), 241 Daxue Road, Shantou, Guangdong 515063, P. R. China.

Correction for 'Isopolymolybdate-based inorganic-organic hybrid compounds constructed by multidentate N-donor ligands: syntheses, structures and properties' by Haiyang Guo et al., Dalton Trans., 2019, DOI: 10. Read More

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http://dx.doi.org/10.1039/c9dt90097gDOI Listing

Ultrahigh phase transition temperature in a metal-halide perovskite-type material containing unprecedented hydrogen bonding interactions.

Dalton Trans 2019 Apr 24. Epub 2019 Apr 24.

Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, P. R. China. and Ordered Matter Science Research Center, Nanchang University, Nanchang, 330031, P. R. China.

A novel organic-inorganic ABX3 perovskite-type material with specific hydrogen bonding interactions, N,N-dimethylethanolammonium trichlorocadmate ([DMEA]CdCl3), has been synthesized as a phase transition material. It is notable that the DMEA cations are arranged to form one-dimensional chains connected by hydrogen bonds at room temperature, which are very sparse in other perovskite-type compounds. The strong intermolecular interactions have made the phase transition temperature of the material reach up to 429 K, as confirmed by differential scanning calorimetry measurements, variable-temperature structural analyses, and dielectric measurements. Read More

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http://dx.doi.org/10.1039/c9dt00945kDOI Listing

Dithieno[3,2-b:2',3'-d]arsole-containing conjugated polymers in organic photovoltaic devices.

Dalton Trans 2019 Apr 24. Epub 2019 Apr 24.

Department of Chemistry, Imperial College London, London, SW7 2AZ, UK.

Arsole-derived conjugated polymers are a relatively new class of materials in the field of organic electronics. Herein, we report the synthesis of two new donor polymers containing fused dithieno[3,2-b:2',3'-d]arsole units and report their application in bulk heterojunction solar cells for the first time. Devices based upon blends with PC71BM display high open circuit voltages around 0. Read More

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http://dx.doi.org/10.1039/c9dt01496aDOI Listing

Self-ordering of chemisorbed PTCDA molecules on Ge(001) driven by repulsive forces.

Phys Chem Chem Phys 2019 Apr 24. Epub 2019 Apr 24.

Department of Electronics Engineering and Computer Science, Fukuoka University, Fukuoka 814-0180, Japan.

Realization of future hybrid electronic devices combining organic and inorganic semiconductors requires a well-defined interface between both components. Such an interface can be formed generally by self-ordering of organic molecules on inorganic substrates, which is usually hindered by strong covalent bonds to the semiconductor surface. In this paper, the 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA) molecules were unexpectedly found to form a locally self-ordered monolayer on a strongly interacting semiconductor surface of the Ge(001). Read More

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http://dx.doi.org/10.1039/c9cp01335kDOI Listing

Ruthenium-catalyzed ortho-selective C-H amination of heteroaryl arenes with di-tert-butyldiaziridinone.

Chem Commun (Camb) 2019 Apr 24. Epub 2019 Apr 24.

State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, P. R. China.

Application of an oxidative amination reagent (di-tert-butyldiaziridinone) to the Ru3(CO)12-catalyzed ortho-selective CAr-H amination reaction is described. This strategy shows good functional group compatibility with various phenyl-substituted N-heterocycles, including biologically active substrates, thus providing synthetic potential for this methodology. Mechanistic studies showed that the reaction process involves an octahedral ruthenium species, and the carbon monoxide ligand plays a crucial role in the C-H activation. Read More

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http://dx.doi.org/10.1039/c9cc02499aDOI Listing

Light harvesting and energy transfer in a porphyrin-based metal organic framework.

Faraday Discuss 2019 Apr 24. Epub 2019 Apr 24.

Department of Chemistry, Virginia Tech, Blacksburg, Virginia 24060, USA.

We present the synthesis and photophysical characterization of a water stable PCN-223(freebase) metal organic framework (MOF) constructed from meso-tetrakis(4-carboxyphenyl)porphyrin (TCPP). The photophysical properties of the synthesized crystalline material were studied using a wide range of steady-state and time-resolved spectroscopic techniques. Quenching experiments performed on TCPP and PCN-223 demonstrated that the extent and the rate of quenching in the MOF is significantly higher than the monomeric ligand. Read More

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http://dx.doi.org/10.1039/c8fd00194dDOI Listing

Intervention analysis and classification: key to health outcomes optimization.

Authors:
Oguchi Nkwocha

Int J Health Care Qual Assur 2019 Mar;32(2):347-359

Clinica de Salud del Valle de Salinas (CSVS), Salinas, California, USA.

Purpose: Measures are important to healthcare outcomes. Outcome changes result from deliberate selective intervention introduction on a measure. If measures can be characterized and categorized, then the resulting schema may be generalized and utilized as a framework for uniquely identifying, packaging and comparing different interventions and probing target systems to facilitate selecting the most appropriate intervention for maximum desired outcomes. Read More

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http://dx.doi.org/10.1108/IJHCQA-03-2018-0066DOI Listing

Metabolomics Profiling of Visceral Adipose Tissue: Results From MESA and the NEO Study.

J Am Heart Assoc 2019 May;8(9):e010810

2 Department of Clinical Epidemiology Leiden University Medical Center Leiden the Netherlands.

Background Identifying associations between serum metabolites and visceral adipose tissue ( VAT ) could provide novel biomarkers of VAT and insights into the pathogenesis of obesity-related diseases. We aimed to discover and replicate metabolites reflecting pathways related to VAT . Methods and Results Associations between fasting serum metabolites and VAT area (by computed tomography or magnetic resonance imaging) were assessed with cross-sectional linear regression of individual-level data from participants in MESA (Multi-Ethnic Study of Atherosclerosis; discovery, N=1103) and the NEO (Netherlands Epidemiology of Obesity) study (replication, N=2537). Read More

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http://dx.doi.org/10.1161/JAHA.118.010810DOI Listing

pJ-Level Energy-Consuming, Low-Voltage Ferroelectric Organic Field-Effect Transistor Memories.

J Phys Chem Lett 2019 Apr 24. Epub 2019 Apr 24.

Ferroelectric organic field-effect transistors (Fe-OFETs) have attracted considerable attention because of their promising potential for memory applications, while a critical issue is the large energy consumption as mainly caused by a high operating voltage and slow data switching. Here, we employ ultrathin ferroelectric polymer and semiconducting molecular crystals to create low-voltage Fe-OFET memories. Devices only require a pJ-level energy consumption. Read More

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http://dx.doi.org/10.1021/acs.jpclett.9b00864DOI Listing

Computer-Guided Discovery of a pH-Responsive Organic Photocatalyst and Application for pH and Light Dual-Gated Polymerization.

J Am Chem Soc 2019 Apr 22. Epub 2019 Apr 22.

In this work, we adopted a fully computer-guided strategy in discovering an efficient pH-switchable organic photocatalyst (OPC), unprecedentedly turning colorless at pH 5 and recovering strong visible-light absorption and photoactivity at pH 7. This is the first example of an OPC design fully guided by comprehensive density functional theory (DFT) studies covering electrostatic, electrochemical, and photophysical predictions. Characterization of the designed OPC after synthesis confirmed the computational predictions. Read More

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http://dx.doi.org/10.1021/jacs.9b01096DOI Listing

Core-Shell-Structured Cyclodextrin Metal-Organic Frameworks for Programmable Cargo Release.

ACS Appl Mater Interfaces 2019 Apr 25. Epub 2019 Apr 25.

State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology , Tianjin University , Weijin Road 92 , Tianjin 300072 , China.

With a simple design, different core-shell-structured cyclodextrin metal-organic frameworks (CD-MOFs) can realize delayed release and bimodal release of a monocomponent and ordered release of a bicomponent, which establishes the basis for a future complicated programming cargo release system. Read More

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http://dx.doi.org/10.1021/acsami.9b01040DOI Listing

Benzo-Fused Periacenes or Double Helicenes? Different Cyclodehydrogenation Pathways on Surface and in Solution.

J Am Chem Soc 2019 Apr 23. Epub 2019 Apr 23.

Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials and Devices, Joint International Research Laboratory of Carbon-Based Functional Materials and Devices , Soochow University , Suzhou 215123 , China.

Controlling the regioselectivity of C-H activation in unimolecular reactions is of great significance for the rational synthesis of functional graphene nanostructures, which are called nanographenes. Here, we demonstrate that the adsorption of tetranaphthyl- p-terphenyl precursors on metal surfaces can completely change the cyclodehydrogenation route and lead to obtaining planar benzo-fused perihexacenes rather than double [7]helicenes during solution synthesis. The course of the on-surface planarization reactions is monitored using scanning probe microscopy, which unambiguously reveals the formation of dibenzoperihexacenes and the structures of reaction intermediates. Read More

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http://dx.doi.org/10.1021/jacs.9b01267DOI Listing

Spin Selectivity in Photoinduced Charge Transfer Mediated by Chiral Molecules.

ACS Nano 2019 Apr 24. Epub 2019 Apr 24.

Optical control and readout of electron spin and spin currents in thin films and nanostructures have remained attractive yet challenging goals for emerging technologies designed for applications in information processing and storage. Recent advances in room-temperature spin polarization using nanometric chiral molecular assemblies suggest that chemically modified surfaces or interfaces can be used for optical spin conversion by exploiting photoinduced charge separation and injection from well-coupled organic chromophores or quantum dots. Using light to drive photoexcited charge-transfer processes mediated by molecules with central or helical chirality enables indirect measurements of spin polarization attributed to the chiral-induced spin selectivity effect, and of the efficiency of spin-dependent electron transfer relative to competitive radiative relaxation pathways. Read More

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http://dx.doi.org/10.1021/acsnano.9b01876DOI Listing

The Prospect of Photochemical Reactions in Confined Gel Media.

Acc Chem Res 2019 Apr 24. Epub 2019 Apr 24.

Institut für Organische Chemie , Universität Regensburg , Universitätsstr. 31 , 93053 Regensburg , Germany.

Nature is intrinsically able to control kinetics, conversion, and selectivity of biochemical processes by means of confined reaction environments such as enzyme pockets, bilayer membranes, micelles, vesicles, cells, or bioorganic frameworks. The main reason for this fact is the optimal molecular alignment and restricted motion of reactant molecules compared to those found in bulk solution. Under this inspiration, a number of synthetic photo-nanoreactors based on supramolecular self-assembled systems have been developed during the last decades, including mesoporous inorganic materials, microemulsions, micelles, vesicles, lipid bilayer foams, polyelectrolyte nanoparticles, etc. Read More

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http://dx.doi.org/10.1021/acs.accounts.9b00097DOI Listing

Novel Conjugated Copolymer as Promising Cathode for Rechargeable Lithium-Ion Battery.

Authors:
Qichun Zhang

Chem Asian J 2019 Apr 23. Epub 2019 Apr 23.

Nanyang Technological University, MSE, 50 Nanyang Ave, 639672, Singapore, SINGAPORE.

A novel conjugated copolymer has been synthesized and employed as an organic cathode material in rechargeable Lithium-ion batteries (LIBs). Due to the synergistic effects from conducting aniline and pyrene units, the resultant batteries based on the as-obtained copolymer can deliver a promising reversible specific capacity of 113 mAh g-1 with a high voltage output of 3.2 V and a remarkable 75. Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/asia.2019005
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http://dx.doi.org/10.1002/asia.201900520DOI Listing
April 2019
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Construction of stable crystalline polyimide porous organic framework for C2H2/C2H4 and CO2/N2 separations.

Chemistry 2019 Apr 23. Epub 2019 Apr 23.

Key Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry, Northeast Normal University, CHINA.

Utilization of porous materials for gas capture and separation has been a hot topic for researchers. Acetylene (C2H2) removal from ethylene (C2H4) exerts an enormous function on refining and petrochemical industry since C2H2 impurity deactivates the catalysts and further terminates polymerization of C2H4. Nowadays carbon dioxide (CO2) emission from power plants contributes to the global climate change and threatens the survival of lives on this planet. Read More

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http://dx.doi.org/10.1002/chem.201900857DOI Listing

Synthesis of Nucleobase-Functionalized Morpholino Monomers.

Methods Mol Biol 2019 ;1973:107-130

Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata, India.

Morpholino antisense oligonucleotides are used as routine tools in developmental biology to investigate gene function during early embryogenesis. These chemically modified oligos contain morpholine ring connected with phosphorodiamidate linkages as backbone but carry unmodified nucleobases. In this chapter, we describe the methods to further modify the nucleobases using palladium-catalyzed cross-coupling reactions. Read More

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http://dx.doi.org/10.1007/978-1-4939-9216-4_7DOI Listing
January 2019

Synthesis Protocols for Simple Uncharged Glycol Carbamate Nucleic Acids.

Methods Mol Biol 2019 ;1973:91-106

CSIR-National Chemical Laboratory, Organic Chemistry Division, Pune, Maharashtra, India.

Glycol carbamate nucleic acid (GCNA) oligomers can be produced from activated carbonate monomers. The synthesized monomers can be very conveniently characterized employing analytical tools like NMR and HR-MS. Moreover, the activated carbonate monomers do not require coupling agents, and hence excess monomers can be recovered at the end of each coupling. Read More

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http://dx.doi.org/10.1007/978-1-4939-9216-4_6DOI Listing
January 2019

Synthesis of Base-Modified dNTPs Through Cross-Coupling Reactions and Their Polymerase Incorporation to DNA.

Methods Mol Biol 2019 ;1973:39-57

Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Prague, Czech Republic.

Synthesis of base-modified dNTPs through the Suzuki or Sonogashira cross-coupling reactions of halogenated dNTPs with boronic acids or alkynes is reported, as well as the use of these modified dNTPs in polymerase incorporations to oligonucleotides or DNA by primer extension or PCR. Read More

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http://dx.doi.org/10.1007/978-1-4939-9216-4_4DOI Listing
January 2019

The C-DILI™ Assay: An Integrated In Vitro Approach to Predict Cholestatic Hepatotoxicity.

Methods Mol Biol 2019 ;1981:75-85

ADME-TOX Division, BioIVT, Durham, NC, USA.

Drug-induced liver injury is an important reason for drug candidate failure. Alterations in the hepatobiliary disposition of bile acids are a proposed mechanism of cholestatic hepatotoxicity. Bile acids are synthesized in the hepatocyte, and excreted into the bile primarily by the bile salt export pump. Read More

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http://dx.doi.org/10.1007/978-1-4939-9420-5_5DOI Listing
January 2019

Structural characteristics of humic substances in buried ancient paddy soils as revealed by C NMR spectroscopy.

Environ Geochem Health 2019 Apr 23. Epub 2019 Apr 23.

College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China.

The study of organic matter in ancient paddy soils is helpful for understanding the influence of human activities on soil carbon sequestration and global climate change. However, little information on the spatial distribution and structural characteristics of the humic substances (HS) in ancient paddy soils is available. The spatial distributions of humic acids (HAs) and fulvic acids (FAs) in ancient paddy soils and modern cultivated paddy soils at the Shanlonggang site on the Liyang Plain were investigated, and the associated structures were characterized by using C nuclear magnetic resonance (NMR). Read More

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http://dx.doi.org/10.1007/s10653-019-00297-4DOI Listing

The lifestyle transition of Arthrobotrys oligospora is mediated by microRNA-like RNAs.

Sci China Life Sci 2019 Apr 23. Epub 2019 Apr 23.

State Key Laboratory for Conservation and Utilization of Bio-Resources in Yunnan, Yunnan University, Kunming, 650091, China.

The lifestyle transition of fungi, defined as switching from taking organic material as nutrients to pathogens, is a fundamental phenomenon in nature. However, the mechanisms of such transition remain largely unknown. Here we show microRNA-like RNAs (milRNAs) play a key role in fungal lifestyle transition for the first time. Read More

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http://dx.doi.org/10.1007/s11427-018-9437-7DOI Listing