Materials Literature
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The molecular structure of human uropepsin, an aspartic proteinase from the urine produced in the form of pepsinogen A in the gastric mucosa, has been determined by molecular replacement using human pepsin as the search model. Crystals belong to space group P2(1)2(1)2(1), with unit-cell parameters a = 50.99, b = 75.56…
A simple encapsulation technique is presented to produce highly phosphorescent, inert nanospheres that are suitable luminescent markers. It is based on the coprecipitation of phosphorescent ruthenium(II)-tris(polypyridyl) complexes and polyacrylonitrile (PAN) derivatives from a solution in N,N-dimethylformamide. The b…
The analysis of temperature-dependent EXAFS spectra based on the cumulant expansion is critically reviewed, seeking for accurate relations between EXAFS parameters and physical properties of crystals. The treatment is based on the distinction between the real and effective distribution of distances, and is divided int…
The crystal structure of the coordination polymer [Mn3(N3)2(nta)4(H2O)2]n (nta = nicotinate) consists of trinuclear subunits bridged by mixed mu-1,1-azide and mu-carboxylate-O,O groups, which are linked by mu 3-nta-N,O,O ligands into a three-dimensional network exhibiting ferrimagnetic-like ordering.
We report here an electrochemical and optical spectroscopic study of new Fe(IV) and Mn(IV) meso -triarylcorrole complexes. The complexes studied are three Fe(IV)Cl, three Mn(IV)Cl, and three dimeric Fe(IV)OFe(IV) meso -tris( p -X-phenyl)corrole complexes, where X = CH 3, H, and CF 3 . The first oxidation potentials of…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSingle-Crystalline Nanowires of Ag2Se Can Be Synthesized by Templating against Nanowires of Trigonal SeByron Gates, Yiying Wu, Yadong Yin, Peidong Yang, and Younan XiaView Author Information Department of Chemistry University of Washington Seattle, Washington 98195 Dep…
ADVERTISEMENT RETURN TO ISSUEPREVNoteViscosimetric, Hydrodynamic, and Conformational Properties of Dendrimers and DendronsBrian M. Tande, Norman J. Wagner, Michael E. Mackay, Craig J. Hawker, and Miyoun JeongView Author Information Center for Molecular and Engineering Thermodynamics, Department of Chemical Engineering…
We present experimental results on resonant spin tunnelling in a single crystal of Mn$_{12}$-2Cl benzoate with different concentration of dislocations. The time evolution of the magnetisation follows the stretched exponential over a few time decades. The values of parameters of stretched exponential deduced from exper…
Aromatic–aliphatic thermotropic liquid crystalline terpolyesters derived from 2,6-naphthalenedicarboxylic acid, hydroquinones, and 8-(3-hydroxyphenyl)octanoic acid (HPOA), a monomer with built-in kink and flexible moieties, were prepared by a melt polycondensation reaction. These polymers were characterized for their…
Polypyrrole (PPy) thin films were prepared electrochemically at a constant potential. Gas-sensing behaviors, including reproducibility, sensitivity, and response time to various benzene, toluene, ethylbenzene, and xylene (BTEX) compound concentrations, were investigated. BTEX compounds were found to be able to compens…
The solubilities of some ferrocenes (ferrocene, ferrocenylmethanol, and 1-ferrocenylethanol) in hexane, benzene, toluene, ethanol, 3-pentanone, and butyl methyl ether have been determined experimentally by a dynamic method at temperatures from (280 to 350) K. The results have been correlated by the Wilson and UNIQUAC…
Abstract The effect of different reaction conditions on the grafting of methyl methacrylate (MMA) onto guar gum (GG) has been studied in detail. The grafting efficiency was optimal under the following conditions: MMA at 1.13 mol/L; ceric ammonium sulfate at 6.32 × 10 −3 mol/L; dextrose monohydrate at 2.428 × 10 −3 mol…
Divergent synthesis methods have been used to prepare 2nd generation dendrimers based on polyhedral silsesquioxane cores with up to 72 terminal groups at their surface. Repetitive hydrosilation/allylation of vinyl-functionalised polyhedral silsesquioxanes produce chlorosilyl- and allyl-derivatised dendrimers respectiv…
Two types of multiporphyrin arrays, mediated by PdCl4(2-) complex ions at the air-water interface, were alternately transferred onto solid supports to form three-dimensional organized multilayers by a layer-by-layer method.
Abstract We report structure–property relationships of polyaniline emeraldine base (EB) films that were produced by combining different processing steps in various sequences. The effect of annealing and doping processes on the surface structure of the films was investigated by atomic force microscopy (AFM), and the co…
Abstract Two series of novel phosphorus‐containing poly(alkylene) amines with or without aromatic groups were synthesized via reacting phosphoryl chloride derivatives with commercially available polyetheramines, ethylenediamine and N‐phenyl‐1,4‐phenylenediamine, respectively. Chemical structures of the amines were cha…
Dynamic secondary ion mass spectrometry was used to investigate the chain mobility of polystyrene (MW ranging from 4.3 to 957 kg/mol) at the free surface. The data show that the diffusion coefficient was reduced relative to the bulk value within a distance, d < or = 4R(g), from the surface and scaled as 1/N(2.5) at fi…
One of the simplest models describing the ion transport in disordered ionic conductors on a microscopic level is the random barrier model. Using Monte Carlo techniques, we simulate, for the first time, the low-temperature particle dynamics in random barrier model systems with long-range Coulomb interactions between th…
This paper deals with X-ray fluorescence (XRF), X-ray diffraction (XRD), and 29 Si nuclear magnetic resonance ( 29 Si NMR) measurements of rice husk silica treated under hydrothermal conditions in autoclave and steam-explosion processes. An understanding of the structural behavior of rice husk silica provides insight…
Abstract Poly(vinyl acetate) (PVAc) was added to the crystalline blends of poly(ethylene oxide) (PEO) and poly( L ‐lactide) (PLLA) (40/60) of higher molecular weights, whereas diblock and triblock poly(ethylene glycol)–poly( L ‐lactide) copolymers were added to the same blend of moderate molecular weights. The crystal…