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。
Double-decker phthalocyanine complexes with Tb3+ or Dy3+ showed slow magnetization relaxation as a single-molecular property. The temperature ranges in which the behavior was observed were far higher than that of the transition-metal-cluster single-molecule magnets (SMMs). The significant temperature rise results from…
SWISS-MODEL (http://swissmodel.expasy.org) is a server for automated comparative modeling of three-dimensional (3D) protein structures. It pioneered the field of automated modeling starting in 1993 and is the most widely-used free web-based automated modeling facility today. In 2002 the server computed 120 000 user re…
Hydrogen pair defects in bulk diamond and on the (111) surface have been investigated using hybrid density functional theory and cluster models, including relaxation of defect atoms. The ${\mathrm{H}}_{2}^{*}$ defect, consisting of one hydrogen atom in a bond inserted (BI) site and the other in an adjacent ``antibondi…
Abstract We report the structural characterization and magnetic behaviour of the spinels with general formula Li 0.5+0.5 x Fe 2.5−1.5 x Ti x O 4 , where x = 1.28 and 1.50. When the samples are cooled slowly, a 1:3 crystallographic order occurs, whereas a random disorder is observed when the samples are quenched. Neutr…
The effects of periodic and aperiodic distortions on the structure factor and radial distribution function of single-component lattices are investigated. To this end, different kinds of distortions are applied to the otherwise perfect square lattice and the corresponding radial distribution function and structure fact…
Abstract Nd–Fe–B sintered magnet scrap powders, viz. “sludge”, as produced in the sizing and polishing processes for well-shaped magnets of small-sized motors and other equipments were effectively recovered as the raw powders for isotropic Nd–Fe–B bonded magnets (Br = 0.66 T, Hcj = 0.92 MA/m, and (BH)max = 70 kJ/m3) b…
Nach einem Templat-induzierten Mechanismus bilden sich Nanofasern aus 1,3-Diphenyl-2-pyrazolin (DP) in wässriger Phase in Gegenwart von Cetyltrimethylammoniumbromid (CTAB). Die oberflächenaktiven CTAB-Moleküle dienen hierbei nicht nur als Kolloid-Stabilisatoren, denn auch die stäbchenförmigen CTAB-Micellen, die sich a…
A facile method for the synthesis of biphenyl polyimides, which involves the nickel-catalyzed coupling of aromatic dichlorides containing imide structure in the presence of zinc and triphenylphosphine, has been developed. The polymerizations proceeded smoothly under mild conditions and produced biphenyl polyimides wit…
We have determined the crystal structure of a phosphatase with a unique substrate binding domain from Thermotoga maritima, TM0651 (gi 4981173), at 2.2 A resolution by selenomethionine single-wavelength anomalous diffraction (SAD) techniques. TM0651 is a member of the haloacid dehalogenase (HAD) superfamily, with seque…
The cyclization and cycloreversion reactions of diarylethene derivatives have been studied with picosecond time-resolved Stokes and anti-Stokes Raman spectroscopies. The cyclization reaction of 1,2-bis(2,5-dimethyl-3-thienyl)perfluorocyclopentene (DMTF) is found to occur within 4 ps to produce the vibrationally excite…
Die überraschende Bildung des ersten Spirodiporphyrins in Form eines Metallkomplexes, des Spirodicorrol-Dinickelkomplexes 1, ist ein Ergebnis der vielseitigen Chemie des „Figure-Eight“-Cyclooctapyrrols Octaphyrin-(1.1.1.0.1.1.1.0). Die Umwandlung des Cyclooctapyrrols in 1 beruht auf einer Folge von Oxidation und einer…
The effect of hydrogen bonding on the phase behavior of binary polymer blends of poly(ethylene covinyl alcohol) (EVOH) with poly( n -butyl methacrylate) (PBMA) and poly(4-vinyl pyridine) (PVPy) was studied by Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR/ATR). The association model of Pain…
We have studied the layered double molybdate $\mathrm{KSc}({\mathrm{MoO}}_{4}{)}_{2}$ under high pressure through Raman scattering experiments. At about 2.0 GPa we observed drastic changes in the Raman spectra associated with a structural phase transition. The high-pressure phase is characterized by the presence of a…
Abstract We report the cyclo‐depolymerization of poly(propylene terephthalate) to give a mixture of cyclic oligomers in 94% yield, the characterization of the mixture by 1 H‐NMR spectroscopy, matrix assisted laser desorption ionization time of flight mass spectrometry and gel permeation chromatography. The major cycli…
Abstract P760‐Gd, a hydrophilic derivative of DOTA‐Gd with a molecular mass of 5.6 kDa, has been characterized in various media: aqueous solution, protein‐containing solution, and Zn 2+ ‐containing solution. Several investigations have been carried out, including the determination of the number of inner‐sphere water m…
Glutamine synthetase (GS) is the key enzyme responsible for the primary assimilation of ammonium in all living organisms, and it catalyses the synthesis of glutamine from glutamic acid, ATP, and ammonium. One of the recently discovered mechanisms of GS regulation involves protein-protein interactions with a small 65-r…
Vernetzte Poren: Bei der Templatsynthese von Metalloxiden mit nichtionischen Alkyl-PEO-Tensiden bilden sich mesoporöse Strukturen (siehe Bild). Ihre einheitlichen Makroporen verlaufen parallel zueinander senkrecht zur Oberfläche und verjüngen sich im Inneren des Festkörpers trichterförmig. Die einzelnen Poren sind dur…
Abstract Various natural and modified polysaccharides ( i.e. arabic gum, tragacanth gum, xanthan gum, sodium alginate, chitosan, sodium carboxymethyl cellulose, hydroxyethyl cellulose, methyl cellulose) were modified using ceric‐initiated graft polymerization of acrylonitrile under inert atmosphere. Grafting was confi…
An experimental study of the high-temperature polymerization of styrene in a CSTR, investigating the effect of reaction temperature (260−343 °C), and residence time (5−90 min) on monomer conversion and average molecular weight and distribution is reported. A kinetic analysis of these experimental data demonstrates tha…
Abstract An interesting ferromagnetic linear trinuclear copper( II ) compound containing an in‐situ synthesised functional ligand has been rationally obtained and crystallographically characterised, confirming a new route to magnetic polynuclear clusters. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, German…