Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Several azulene-substituted thioketones, 1-thiobenzoylazulene (1a) and di(1-azulenyl) thioketone (2a) and their derivatives (1b and 2b-d) with alkyl substituents on each azulene ring, were prepared and their intramolecular pericyclization reaction was examined. The thioketones with a 3-alkyl substituent on each azulen…
We synthesized a series of analogues of 5,20-diphenyl-10,15-bis(4-carboxylatomethoxy)phenyl-21,23-dithiaporphyrin (I) as potential photosensitizers for photodynamic therapy (PDT). The photosensitizers differ in the length of the side chains that bind the carboxyl to the phenol at positions 10 and 15 of the thiaporphyr…
The influence of covalently attaching hydroxymethylene to the methyl groups of methyl-tri-n-alkylphosphonium halides (where the alkyl chains are decyl, tetradecyl, or octadecyl and the halide is chloride or bromide) or adding methanol as a solute to the salts on their solid, liquid-crystalline (smectic A2), and isotro…
The combined influence of surface topography and charge of a polymer surface on the adsorption of the protein avidin has been investigated. Atomic force microscopy contact mode imaging and charge writing were used to create defined topographical roughness and electrostatic charge patterns on the surface of polystyrene…
Unsymmetrical heteroacenes, 11-phenylbenzofuro[3,2-b]carbazole (Ph-BFC) and its alkoxylated derivatives, were readily synthesized by palladium-catalyzed double N-arylation of arylamines. They characteristically form antiparallel cofacial pi-stacking arrangements, which may result from their unsymmetrical structures. T…
The low volatility and thermal instability made the photoelectron (PE), electron transmission (ET), and dissociative electron attachment (DEA) spectroscopy measurements on curcumin (a potent chemopreventive agent) unsuccessful. The filled and empty electronic structure of curcumin was therefore investigated by exploit…
Abstract The electrolytic properties of a lithium battery electrolyte based on triethyl(2-methoxyethyl)phosphonium bis(trifluoromethylsulfonyl)imide are described. Testing charge–discharge performance of the cell containing the lithium-binary phosphonium ionic liquid electrolyte showed excellent capacity and rechargea…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Water-Soluble Homopolymers and Block Copolymers in Homogeneous Aqueous Solution via Nitroxide-Mediated PolymerizationTrang N. T. Phan and Denis BertinView Author Information UMR 6264 "Laboratoire Chimie Provence", Université de Provence-CNRS, Avenue Escadrille Norm…
We have investigated the electronic structure and transport properties of a pi-stacking molecular chain which is covalently bonded to a H/Si(100) surface, using the first-principles density functional theory approach combined with Green's function method. The highest occupied molecular orbital (HOMO) dispersion is rem…
Two types of fluorene-based copolymers, with 1-phenylisoquinoline-iridium complexes incorporated into the polyfluorene main chain by either embedding ( P 1 and P 2 ) or end-capping ( P 3 ) manners via ancillary ligand β-diketonate were synthesized by the Suzuki polycondensation reaction and characterized by 1 H NMR, 1…
EPR line shifts due to spin exchange of perdeuterated 2,2,6,6-tetramethyl-4-oxopiperidine-1-oxyl (14N-PDT) in aqueous solutions and the same probe isotopically substituted with 15N (15N-PDT) were measured from 293 to 338 and 287 to 353 K, respectively. Nonlinear least-squares fits of the EPR spectra yielded the resona…
A series of optically active phenyl isocyanides bearing various chiral functional groups, such as l -alanine, l -alaninol, l -phenylalanine, and l -lactic acid residues, with a long n -decyl chain as the pendants were prepared, and these were polymerized with an achiral nickel catalyst (NiCl 2 ) in various organic sol…
UDP-galactopyranose mutase (UGM) is the key enzyme involved in the biosynthesis of Galf. UDP-Galp and UDP-Galf are two natural substrates of UGM. A protocol that combines the use of STD-NMR spectroscopy, molecular modeling, and CORCEMA-ST calculations was applied to the investigation of the binding of UDP-Galf and its…
The success of many therapies in regenerative medicine requires the ability to control the formation of stable vascular networks within tissues. The formation of new blood vessels, or neovascularization, is mediated, in part, by interactions between endothelial cells (ECs) and insoluble factors in the extracellular mi…
The mechanisms of oxidative N-dealkylation of amines by heme enzymes including peroxidases and cytochromes P450 and by functional models for the active Compound I species have long been studied. A debated issue has concerned in particular the character of the primary step initiating the oxidation sequence, either a hy…
In this paper, the effect of prolonged C60(+) primary ion bombardment on the chemical information available from a section of rat brain is discussed. Initial attempts demonstrate the rapid loss of molecular signal from the bombarded area with both C60(+) and Au(+) used as a monatomic comparison. However, the nature of…
Chemical looping combustion (CLC) with syngas, a synthesized gas mixture of CO, H 2, CO 2, H 2 O(g), N 2, and H 2 S, was investigated using thermodynamic simulation, with focus on carbon deposition and sulfur evolution in CLC. Five metal oxides, such as NiO, CuO, Fe 2 O 3, Mn 3 O 4, and CoO, were selected as oxygen ca…
Zeolites Al,Na−X and Al,Na−Y with defined numbers of extraframework aluminum cations were prepared by exchange in an aqueous solution of aluminum nitrate. A maximum concentration of Brønsted acidic bridging OH groups in supercages (SiOH sup Al) was reached upon dehydration of zeolites Al,Na−X and Al,Na−Y at 423 K. Fur…
High-valenttransition metal-oxo species are active oxidizing species in many metal-catalyzed oxidation reactions in both Nature and the laboratory. In homogeneous catalytic oxidations, a transition metal catalyst is oxidized to a metal-oxo species by a sacrificial oxidant, and the activated transition metal-oxo interm…
A novel self-assembling poly(ethylene glycol) hydrogel system based on inclusion complexes between β-cyclodextrin (β-CD) and cholesterol is described. Hydrogels are formed after hydration of a mixture of star-shaped 8-arm poly(ethylene glycol) (PEG) end-modified with β-CD groups and the same star-shaped PEG end-modifi…