Physical Chemistry for Life Science Laboratory, Faculty of Pharmaceutical Sciences, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Japan. and Japan Science and Technology Agency, PRESTO, 4-1-8 Hon-cho, Kawaguchi, Saitama, Japan.
Age-related macular degeneration (AMD) is the leading cause of blindness worldwide. Although the cause of AMD remains unknown, lipid peroxidation (LPO) end-products are critical molecules for its development. Herein, we report the imaging of lipid radicals, which are key factors in the LPO reaction, and therapeutic information using animal models. Read More
Supramolecular and Organometallic Chemistry Lab, Department of Inorganic Chemistry, School of Chemistry, Madurai Kamaraj University, Madurai, Tamil Nadu-625 021, India.
A new class of easily available and readily tunable proline based chiral organocatalysts was found to efficiently catalyse an unprecedented highly enantioselective asymmetric Darzens reaction of α-chloroketones and substituted α-chloroketones with various aldehydes, which directly produces optically active di- and tri-substituted chiral epoxides with higher product yields (up to 97%) and excellent ee's (up to 99%) under mild reaction conditions. Read More
Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF), Universität Freiburg, Albertstr. 21, 79104 Freiburg, Germany.
Examples of tin dications without closer contacts to the anion are rare, as are straightforward routes to weakly coordinated tin(ii) dication salts. Here we report on the synthesis of [Sn(MeCN)6][Al(OR(F))4]2 (R(F) = C(CF3)3) via NO(+)-oxidation of tin metal. Subsequently, [Sn(MeCN)6][Al(OR(F))4]2 was used to prepare the mixed coordinated [Sn(pyr)2(MeCN)4][Al(OR(F))4]2 and [Sn(PPh3)2-(MeCN)5][Al(OR(F))4]2·MeCN. Read More
Ingénierie et Architectures Macromoléculaires, Institut Charles Gerhardt, UMR 5253 CNRS, UM, ENSCM, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France.
Unprecedented synthesis of multiblock poly(vinylidene fluoride) (PVDF, up to 16 300 g mol(-1)) with narrow-dispersity blocks (Đ = 1.26) mediated by a fluorinated cyclic xanthate via reversible addition-fragmentation chain transfer (RAFT) polymerization is reported. The as-synthesized multiblock PVDF was employed as a macroRAFT agent to prepare valuable multiblock copolymers with potential applications in emerging areas. Read More
Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, Fukuoka 819-0395, Japan. and Center for Molecular Systems (CMS), Kyushu University, Fukuoka 819-0395, Japan.
The electrochemical trifluoromethylation and perfluoroalkylation of aromatic compounds mediated by a vitamin B12 derivative as a cobalt-based catalyst has been developed. The Co(i) species of a vitamin B12 derivative, prepared by controlled-potential electrolysis at -0.8 V vs. Read More
School of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia.
A two-dimensional metal-organic framework (MOF) comprising nickel species and an organic ligand of benzenedicarboxylic acid is fabricated and explored as an electrocatalyst for urea oxidation reaction (UOR). The excellent UOR performance is found to be partially due to the high active site density of the two-dimensional MOF, and largely because of the high oxidation state of the nickel species. Read More
Department of Chemistry, Indiana University, 800 East Kirkwood Avenue, Bloomington, Indiana 47405, USA.
The recognition of nitroaromatic explosives by a tetrakis-tetrathiafulvalene-calixpyrrole receptor (TTF-CP) yields a "turn on" and fingerprinting response in the resonance Raman scattering observed in solution and the solid state. Intensity changes in nitro vibrations with analyte complexation occur via a mechanism of resonance between the 785 nm laser line and the strongly absorbing charge-transfer chromophore arising from the complex between electron-donating TTF-CP and electron-accepting nitroaromatic explosives. The addition of chloride forms the Cl(-)·TTF-CP complex resetting the system for reuse. Read More
College of Pharmaceutical Sciences, Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, Southwest University, Chongqing 400715, China.
The widely existing transmembrane helices can serve as a novel type of binding site for recognizing corresponding membrane receptors. Through imprinting the transmembrane domain of certain receptors, here we report the construction of polymeric nanoparticles which can achieve enhanced cellular uptake and permeability in target tissues for tumor-targeted drug delivery. Read More
Key Laboratory for Biomass-Resource Chemistry and Environmental Biotechnology of Hubei Province, School of Resource and Environmental Science, Wuhan University, Wuhan 430072, P. R. China.
Metal phenolic networks (MPNs) were used for the first time for the construction of core@shell MOF materials. Diverse functional nanocores with different shapes and sizes could be coated with ZIF-8 shells mediated by MPNs. The obtained Fe3O4@TA-Fe(3+)@ZIF-8 powder showed a superhydrophobic nature which could efficiently absorb n-hexane from water. Read More
Key Laboratory for Advanced Materials and Institute of Fine Chemicals, School of Chemistry & Molecular Engineering, East China University of Science and Technology, 130 Mei Long Road, Shanghai 200237, China.
A catalytic domino amination and oxidative coupling of in situ prepared gold acetylides has been developed for the synthesis of abnormal NHC (aNHC) gold complexes, and key vinylene digold intermediates are isolated and structurally characterized. Read More
Department of Chemistry, Xiamen University, Xiamen, 361005, P. R. China and Department of Chemistry, Tsinghua University, Beijing, 100084, P. R. China.
Gold(i) phosphinopyridyl clusters [Au9(PNC)6](BF4)3 (1) and [Au11(PNC)6(PPh3)2](BF4)5 (2) (PNC = 2-diphenylphosphinopyridyl monoion) are assembled. In contrast to the green luminescence of 1, 2 is brightly orange emissive in CH2Cl2, which shows the presence of unsupported Au(I)-Au(I) interactions in solution. Besides, 1 and 2 can selectively light up the mitochondria of living cells. Read More
Multicomponent MoS2/Co9S8/C hollow nanocubes were developed by the one-pot solvothermal method and a subsequent calcination process. Benefitting from the merits of hollow structures, the highly-conductive carbon matrix and the buffering effect provided by uniformly-mixed MoS2 and Co9S8, the MoS2/Co9S8/C anode shows high capacity and rate capability as the anode of sodium-ion batteries. Read More
Crystals of a hydrated Pu(iii) chloride, (C5H5NBr)2[PuCl3(H2O)5]·2Cl·2H2O, were grown via slow evaporation from acidic aqueous, high chloride media. X-ray diffraction data reveals the neutral [PuCl3(H2O)5] tecton is assembled via charge assisted hydrogen and halogen bonds donated by 4-bromopyridinium cations and a series of inter-tecton hydrogen bonds. Read More
Institute of Industrial Science, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
We have found that a series of N-(5-bromosalicylidene) alkylamines exhibited distinct chromic behaviour depending on the parity of their alkyl chain length. A group with an even number of carbon atoms in the alkyl chain showed photochromism, while another group with odd number showed thermochromism. Read More
Supramolecular Machines and ARchitectures Team, Institut des Biomolécules Max Mousseron (IBMM), Univ. Montpellier, UMR 5247 CNRS, ENSCM, Case Courrier 1706, Bâtiment Chimie (17), 3ème étage, Faculté des Sciences, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France.
A straightforward slippage strategy has been used for the synthesis of three rotaxane building blocks that all contain an ammonium template for the dibenzo-24-crown-8 macrocycle and an N-hydroxysuccinimide end. The kinetic rate of the slipping-on process proved to be highly dependent on both the length and flexibility of the thread. Read More
Biophysics Program and Department of Chemistry, The University of Michigan, Ann Arbor, MI 48109-1055, USA.
Polymer lipid nanodiscs have enabled some exciting structural biology and nanobiotechnology applications. The use of a small molecular weight polymer (SMA-EA) has been demonstrated to dramatically increase the size of nanodiscs (up to ∼60 nm diameter). Here, we report the first demonstration of the formation of macro-nanodiscs for a variety of lipids, and solid-state NMR experiments utilizing their magnetic-alignment properties. Read More
Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore. and Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore, 117602, Singapore.
Fine-tuning electron acceptors through changing one cyano group to an amide generates a more stable and emissive fluorophore with the character of aggregation-induced emission. Conjugation between the new fluorophore and CFFKDEL generated an excellent ER targeting light-up probe with high specificity and good photostability. Read More
Department of Pharmaceutical and Medicinal Chemistry, Royal College of Surgeons in Ireland, 123 St. Stephen's Green, Dublin 2, Ireland.
A series of 1,2,4,5-tetrazine integrated near infrared (NIR) fluorophores based on the BF2 azadipyrromethene (NIR-AZA) class has been synthesised and their ability to modulate emission from low to high in response to Diels-Alder cycloaditions has been assessed. Substituents on the tetrazine component of the probe (Cl, OMe, p-NO2C6H4O) were seen to strongly influence quantum yields, fluorescence enhancement factors, and rates of cycloadditions. Cycloadditions between tetrazine-NIR-AZA constructs and a strained alkyne substrate were seen to be highly efficient in organic or aqueous solutions and in gels with high fluorescence enhancements of up to 48-fold observed. Read More
Laboratory for Organic & Microwave-Assisted Chemistry (LOMAC), Department of Chemistry, University of Leuven (KU Leuven), Celestijnenlaan 200F, B-3001, Leuven, Belgium. and Peoples Friendship University of Russia (RUDN University) Miklukho-Maklaya street 6, 117198 Moscow, Russia.
A cascade approach has been developed towards dual C-C bond formation via consecutive C-H functionalization/cyclization giving access to pyrrolo[1,2-a]indoles in a highly regio- and diastereoselective manner using catalytic [Ru(p-cymene)Cl2]2. The methodology was further expanded to attain pentacyclic structures involving manifold C-C bond creation. Read More
Institute of Physical Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, Warsaw 01-224, Poland and Department of Chemistry, Warsaw University of Technology, Noakowskiego 3, Warsaw 00-664, Poland.
The controlled oxygenation of alkylzinc complexes supported by a 2-ester substituted pyrrolate ligand (L) leads to zinc alkoxides with an uncommon structural motif in the solid state: a trimer [(L)Zn(μ-O(t)Bu)]3 with the central [Zn3(μ-OR)3] ring and a tetramer [(L)Zn(μ3-OEt)]4 with a heterocubane-type structure. Strikingly, these seemingly simple zinc alkoxides are not accessible via the classical alcoholysis route. Read More
A Ni(OAc)2/Ag(OTf) catalysed coupling of aryl alkynes and propargylic alcohol/ether/ester gave the corresponding unsymmetrical 1,3-diynes in good to excellent yields. The reaction does not require bases, ligands or additives and shows excellent hetero-selectivity, thereby addressing the current challenges in the field of coupling of two different terminal alkynes. Read More
A fluorescent probe that enables ratiometric imaging of endogenous hypochlorous acid (HOCl) in cells and tissues by two-photon microscopy is developed based on a red-emitting acetyl-benzocoumarin (AcBC) dye. An oxathiolane group in the probe reacts with HOCl to generate the AcBC dye, which involves a ratiometric fluorescence change only toward HOCl along with high sensitivity. Read More
Laboratory of Chemical Bioscience, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University (TMDU), 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan.
Various diaryl sulfides, including heteroaryl- and nitrogen-containing sulfides, have been efficiently prepared by rhodium-catalyzed odorless deborylative arylthiolation of organoborons with S-aryl thiosulfonates. The ready availability of starting materials and further transformation of sulfides have rendered a diverse range of organosulfur compounds easily accessible. Read More
State Key Laboratory of Analytical Chemistry for Life Science and Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, P. R. China.
Beijing National Laboratory for Molecular Sciences (BNLMS), CAS Key Laboratory of Molecular Recognition and Function, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. and Key Lab of Functional Molecular Engineering of Guangdong Province (South China University of Technology), Guangzhou 510640, China and University of Chinese Academy of Sciences, Beijing 100049, China.
We report a simple protocol that affords oxidative demethylation of N(6)-methyl groups in N(6)-methyl adenines (m(6)A). The biologically compatible photocatalyst riboflavin prompts a highly selective C-H abstraction from N(6)-methyl in adenines under the irradiation of a visible blue LED light, affording a novel and highly selective biomimetic demethylation of m(6)A and related N-methyl adenine analogues. Read More
International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan. and Australian Institute for Innovative Materials (AIIM), University of Wollongong, Squires Way, North Wollongong, NSW 2500, Australia and School of Chemical Engineering & Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, QLD 4072, Australia.
Here, ultrathin nitrogen-doped carbon/graphene nano-sandwiches were synthesized by carbonization of graphene oxide-based nanosheets, which were fully covered with ultrasmall ZIF-8 nanocrystals. The novel sandwich structure possesses large accessible surface area, excellent electrical conductivity, and high nitrogen content, thus showing superior desalination performance. Read More
Department of Bioproducts and Biosystems Engineering, University of Minnesota St. Paul, MN 55108-6005, USA.
Through a simple chemical activation of biomolecules present in the outer structures of microbial cells, microorganisms can be rapidly isolated on gold-coated surfaces in a microfluidic device with over 99% capture efficiency. Bacterial and fungal cells can be selectively captured, concentrated and retrieved for further analysis. Read More
The synthesis of a novel rectilinearly π-extended rhodamine dye (TJ730) has been described. It exhibits NIR fluorescence emission with a Stokes shift of >110 nm. TJ730 and its ester derivative are cell permeable, have low cytotoxicity, are biocompatible, and can be directly used as NIR tracers for lysosome staining. Read More
Tungsten(iv) tetrakis(2,6-diisopropylphenoxide) (1) has been demonstrated to be a competent platform for decarbonylative formation of anionic terminal pnictide complexes upon treatment with pnictaethynolate anions: cyanate, 2-phosphaethynolate, and 2-arsaethynolate. These transformations constitute the first examples of terminal phosphide and arsenide complex formation at a transition metal center from OCP(-) and OCAs(-), respectively. The phosphide and arsenide complexes are also the first to be isolated in a tetragonal, all-oxygen ligand environment. Read More
CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, Anhui 230026, China.
A RAFT/MADIX method can not only copolymerize ethylene with a diverse range of functionally polar monomers, but can also easily tune the polar composition and the polar monomer distribution along the produced copolymer chains. This highly versatile RAFT/MADIX copolymerization platform provides access to a diverse range of polyethylene materials. Read More
Department of Chemistry, Division of Molecular Imaging and Photonics, KU Leuven, Celestijnenlaan 200F, 3001 Heverlee, Belgium. and RIES, Hokkaido University, N20W10, Kita-Waird Sapporo, 001-0020, Japan.
A simple and fast one-step fabrication method of silver nanoparticles (AgNPs) on a polydimethylsiloxane (PDMS) film and their improvement as highly sensitive surface enhanced Raman scattering (SERS) substrates via atomically thin Au coatings is demonstrated. The thin Au layer provides oxidation resistivity while maintaining the broad spectral range SERS sensitivity of Ag nanoparticles. Read More
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China.
A carbon-free MoO2 nanosheet with amorphous/crystalline hybrid domain was synthesized, and demonstrated to be an efficient host material for lithium-ion capacitors. Discrepant crystallinity in MoO2 shows unique boundaries, which can improve Li-ion diffusion through the electrode. Improved rate capacities and cycling stability open the door to design of high-performance lithium ion capacitor bridging batteries and supercapacitors. Read More
State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Material, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China. and State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Shanghai, 200032, P. R. China.
A photosensitizer-free, highly efficient sunlight-promoted tandem [3+2]/[4+2] annulation of unsaturated α-bromocarbonyls with o-alkynylanilines was developed, and allowed for convenient synthesis of fused benzobicyclic skeletons. The reaction was clean and practical in mild conditions and showed excellent functional group compatibility. Read More
A ruthenium based photoredox catalyst in combination with a substoichiometric amount of 1,4-diazabicyclo[2.2.2]octane (DABCO) efficiently catalyzed dual decarboxylative couplings between alkenyl carboxylic acids and N-(acyloxy)phthalimides derived from aliphatic carboxylic acids, delivering alkylated styrene derivatives in a high regio- and stereo-selective manner under mild reaction conditions. Read More
Key Laboratory of Materials Physics, Centre for Environmental and Energy Nanomaterials, Anhui Key Laboratory of Nanomaterials and Nanotechnology, CAS Center for Excellence in Nanoscience, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China. and Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, QLD 4222, Australia.
A Mn-incorporated Ni(OH)2/carbon fiber cloth (Mn-Ni(OH)2/CFC) fabricated via a room-temperature solution route exhibited superior electrocatalytic activities of the oxygen reduction and urea oxidation reactions, delivering 12-21% energy saving in the charging process of Mn-Ni(OH)2/CFC assembled Zn-air batteries in the presence of 0.5 M urea compared to the battery without urea. Read More
Herein, we report a novel strategy for a covalent modification of graphene nanoplatelets with photoactive dyes. The functionalization of the graphene surface was carried out using white light to photochemically generate phenazine radicals and the reaction progress was followed up spectrophotometrically. The characterization of the modified material was carried out using FTIR, XRD, UV-vis absorption, fluorescence, Raman spectroscopy and SEM imaging. Read More
Faculty of Materials Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan.
A metal-lustrous self-standing film, named "porphyrin foil", was formed from a glass-forming polymeric porphyrin. The amorphous glass nature of the porphyrin foil played a key role in spontaneously producing a smooth surface. Its sharp contrast in intense absorption and specular reflection of light at each wavelength provided a brilliant metallic lustre. Read More
Department of Chemistry and Biochemistry, University of California, La Jolla, San Diego, CA 92023-0358, USA.
The concept of isoreticular chemistry has become a core principle in metal-organic framework (MOF) materials. Isoreticular chemistry has shown that organic ligands of different sizes, but with a common geometry/symmetry can be used to generate MOFs of related topologies, but with expanded pore sizes and volumes. In this report, polymer-MOF hybrid materials (polyMOFs) with a UiO (UiO = University of Oslo) architecture are shown to adhere to the principle of isoreticular expansion, generating polyMOFs with large surface areas and enhanced stability. Read More
We have developed a novel approach for the stereodivergent hydrodefluorination of gem-difluoroalkenes using copper(i) catalysts to obtain stereodefined monofluoroalkenes. Both (Z)- and (E)-terminal monofluoroalkenes were obtained by the hydrodefluorination of gem-difluoroalkenes in the presence of copper(i) catalysts and diboron or hydrosilane, respectively, with high stereoselectivity. DFT calculations were conducted to elucidate the stereoselectivity. Read More
College of Life Sciences, Qingdao University, Qingdao, 266071, P. R. China.
We developed a novel method to control carryover contamination in loop-mediated isothermal amplification (LAMP) by primer engineering to carry recognition sites for a restriction endonuclease, providing a robust ability to eliminate carryover contaminants. Read More