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。
Solid state, variable temperature 15 N‐NMR studies make it possible to predict the behavior of the four N atoms and the two internal H atoms in the isomeric porphine and porphycene. The spectra of porphine indicate a statistical disorder of the internal H atoms. In the case of porphycene it can be concluded that there…
Abstract The reductive dissolution by Na-dithionite of 28 synthetic goethites and 26 hematites having widely different crystal morphologies, specific surfaces and aluminium substitution levels has been investigated. For both minerals the initial dissolution rate per unit of surface area decreased with aluminium substi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCP/MAS carbon-13 NMR spectra of the crystalline components of native cellulosesFumitaka Horii, Asako Hirai, and Ryozo KitamaruCite this: Macromolecules 1987, 20, 9, 2117–2120Publication Date (Print):September 1, 1987Publication History Published online1 May 2002Published ini…
The C KLL spectra from natural diamond, graphite, and single-crystal β-SiC have been investigated using x-ray photoelectron spectroscopy and first-derivative x-ray excited Auger electron spectroscopy (XAES). It is shown that the XAES spectra is essentially the same as that obtained with conventional AES with the added…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic interaction and spin transition in iron(II) dinuclear compounds. Crystal structure of (.mu.-2,2'-bipyrimidine)bis[(2,2'-bipyrimidine)bis(thiocyanato)iron(II)]Antonio Real, Jacqueline Zarembowitch, Olivier Kahn, and Xavier SolansCite this: Inorg. Chem. 1987, 26, 18,…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman spectrometry of organo phosphorus chemical agentsAla M. Alak and Tuan. Vo-DinhCite this: Anal. Chem. 1987, 59, 17, 2149–2153Publication Date (Print):September 1, 1987Publication History Published online1 May 2002Published inissue 1 September 1987https:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotosensitized reduction of carbon dioxide to methane and hydrogen evolution in the presence of ruthenium and osmium colloids: strategies to design selectivity of products distributionItamar Willner, Ruben Maidan, Daphna Mandler, Heinz Duerr, Gisela Doerr, and Klaus Zengerl…
The title compound 1 and its nickel complex fulfill all that was hoped for: Substitution of porphycene with four propyl groups leads (as in the case of porphyrins) to increased solubility and crystallizability. 1 is distinguished by strong NH…N hydrogen bridges and by NH tautomerism. The nickel complex has the expect…
Abstract The liquid crystalline behavior of low molecular weight compounds has been known for more than a century; synthetic polymers have been manufactured on a large scale for several decades, but just recently it was found possible to produce polymers using the structural principles of liquid crystalline compounds.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and crystal structure of a novel tripyrrane-containing porphyrinogen-like macrocycleJonathan L. Sessler, Martin R. Johnson, and Vincent LynchCite this: J. Org. Chem. 1987, 52, 19, 4394–4397Publication Date (Print):September 1, 1987Publication History Published onli…
Abstract An improved method is presented for separating whole soil into a mineral‐free organic fraction (light fraction) and an organomineral fraction (heavy fraction) by flotation in a dense inorganic salt solution. In the existing method, the heavy fraction is settled by centrifugation and the light fraction decante…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new low-temperature route to metal polychalcogenides: solid-state synthesis of potassium titanium sulfide (K4Ti3S14), a novel one-dimensional compoundSteven A. Sunshine, Doris Kang, and James A. IbersCite this: J. Am. Chem. Soc. 1987, 109, 20, 6202–6204Publication Date (Pr…
The magnetic and structural properties of RTiFe ternary alloy system were investigated. It was found that the alloy includes a new compound having the ratio of R to Ti to Fe of 1:1:10 and tetragonal structure. The SmTiFe10compound has a high saturation magnetization and magnetic anisotropy. It was also found that the…
Dynamic and static properties of a polymer chain without self-excluded volume, which performs Brownian motion between randomly distributed impenetrable fixed obstacles, have been investigated by Monte Carlo simulations and analyzed by scaling considerations. The mean square radius of gyration 〈S2〉, the center-of-mass…
Abstract Anodic overoxidation of polypyrrole in the presence of nucleophiles such as H 2 O, OH − , CH 3 OH, CH 3 O − , Br − and CN − has been studied in detail. At potentials up to 2.1 V (vs. SCE), irreversible anodic peaks are observed with 200 nm layers on Pt. In most of the cases, a total of z = 4 – 6 F /mol monome…
The phase diagram of a system of hard parallel spherocylinders with length-to-width ratios L/D between 0 and \ensuremath{\infty} is investigated by Monte Carlo simulation. In addition to a low-density nematic phase and a high-density crystalline phase, two phases with partial translational order are observed, viz., a…
Sixteen characterized alcohol dehydrogenases and one sorbitol dehydrogenase have been aligned. The proteins represent two formally different enzyme activities (EC 1.1.1.1 and EC 1.1.1.14), three different types of molecule (dimeric alcohol dehydrogenase, tetrameric alcohol dehydrogenase, tetrameric sorbitol dehydrogen…
The three-dimensional structure of a genetically engineered variant of porcine growth hormone, methionyl porcine somatotropin (MPS), has been determined at 2.8-A resolution, using single crystal x-ray diffraction techniques. Phases were obtained by use of a single isomorphous K2OsCl6 derivative and were improved by us…
Not available