Materials Literature
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The occurrence of glass in the three binary and one ternary oxide systems containing Ge, Bi, and Tl was studied by air‐ and water‐quenching melted samples. Bulk glass occurred widely in these systems and was obtained with as little as 10 mol% GeO 2 , combined with 68 mol% BiO 1.5 and 22 mol% TIO 0.5 . Some glass occur…
The applicability of the hydrodynamical model, obtained from the high-frequency expansion of the density-density response function, for calculating the surface plasmon dispersion relation and plasmons of higher polarity is analyzed. Of crucial importance to get any result for the dispersion coefficients is that the un…
At high conversions of monomer (or high polymer concentrations), chain entanglements and a glassy-state transition (significant reduction in free volume) can have a profound effect on the relative rates of free-radical reactions which control the molecular structure of polymer chains. In particular, it will be shown t…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-pressure synthesis, crystal structures, and luminescence properties of europium(II) metasilicate and europium(II)-activated calcium and strontium metasilicatesKenichi Machida, Ginya Adachi, Jiro Shiokawa, Masahiko Shimada, Mitsue Koizumi, Kaichi Suito, and Akifumi Onode…
The classical form of the Nernst-Einstein relation is discussed. It is shown that it leads to an obviously non-general relation between the tracer diffusion coefficient and the chemical diffusion coefficient. The Onsager phenomenological equations are used to deduce an exact form of the Nernst-Einstein relation which…
Abstract The swelling behavior of water in a poly(ethylene–vinyl alcohol) copolymer (70 mol % vinyl alcohol) has been characterized at 25°C by vapor and liquid sorption experiments over a range of water activities. The activity of the vapor phase has been varied by incrementing the pressure of the water vapor in the s…
Abstract The grafting of styrene and acrylamide, from both their binary and unitary systems, on cellulose acetate film was studied by means of the cobalt‐60 postirradiation grafting technique. The extent of grafting was found to be dependent on preirradiation dose, reaction time, and temperature, and the optimum condi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAn intermediate-spin iron(III) porphyrin complex with a vinylidene group inserted into a iron-nitrogen bond: paramagnetic susceptibility, EPR, and Moessbauer propertiesDaniel Mansuy, Irene Morgenstern-Badarau, Marc Lange, and Pierre GansCite this: Inorg. Chem. 1982, 21, 4, 1…
Transmission spectra were measured with obliquely incident light for a chiral smectic C phase of (+)-4-n-hexyloxyphenyl 4−(2″-methyl-butyl)biphenyl 4′-carboxylate. Extra reflection bands were observed at about twice the wavelengths of the “normal” Bragg reflection bands, which had been previously predicted by the comp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic forms of 6-nitrobenzospiropyran. Emission spectroscopic and ODMR investigationsM. Gehrtz, C. Braeuchle, and J. VoitlaenderCite this: J. Am. Chem. Soc. 1982, 104, 8, 2094–2101Publication Date (Print):April 1, 1982Publication History Published online1 May 2002Publ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSpectrophotometric study of copper(II) chloride complexes in propylene carbonate and in dimethyl sulfoxideMax Elleb, Jean Meullemeestre, Marie Jose Schwing-Weill, and Francois VierlingCite this: Inorg. Chem. 1982, 21, 4, 1477–1483Publication Date (Print):April 1, 1982Publica…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTrinuclear iridium cluster containing a tricoordinate bridging hydrogen ligand: structural and chemical studiesDaniel F. Chodosh, Robert H. Crabtree, Hugh Felkin, Sheila Morehouse, and George E. MorrisCite this: Inorg. Chem. 1982, 21, 4, 1307–1311Publication Date (Print):Apr…
Although single‐crystal beta‐ and beta''‐aluminas can be ion‐exchanged by immersion in molten nitrates, polycrystalline membranes of Na‐β'‐Al 2 O 3 fracture on contact with molten KNO 3 . A KCl vapor ion‐exchange process allows synthesis of leaktight potassium‐ion‐conducting β''‐Al 2 O 3 membranes. Material properties…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExchange interaction in multinuclear transition-metal complexes. 1. Synthesis, x-ray structure, and magnetic and spectroscopic properties of di-.mu.-methoxy-dichloro[1,4-piperazinebis(N-ethylenesalicylaldiminato)]diiron(III), Fe2L(OCH3)2Cl2B. Chiari, O. Piovesana, T. Tarante…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolybdenum(IV)-oxo complexes with oxygen, nitrogen and sulfur ligands. Syntheses and electrochemical studiesI. W. Boyd and J. T. SpenceCite this: Inorg. Chem. 1982, 21, 4, 1602–1606Publication Date (Print):April 1, 1982Publication History Published online1 May 2002Published…
Abstract The formation of volatile aromatic pyrolyzates in poly(vinyl chloride) has been studied by pyrolysis–gas chromatography–mass spectroscopy. Results from isotopic labeling experiments with perdeutero‐PVC suggest that the aromatic pyrolyzates can be divided into three general classes with respect to their format…
The strength improvement of an injection‐molded and sintered silicon nitride ceramic (15.5 wt% Y 2 O 3 +10.1 wt% SiO 2 ) produced by an oxidation heat treatment at 1500°C is reported. The ceramic retains its strength after prolonged intermediate temperature exposure in air, whereas the untreated material suffers vario…
Heat-stable L-lactate dehydrogenase [EC 1.1.1.27] was purified from an extremely thermophilic bacterium belonging to the genus Thermus, and it showed an allosteric nature dependent on fructose 1,6-bisphosphate as an effector. The enzyme had a molecular weight of approximately 120,000 with a subunit molecular weight of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNovel unusually stable peroxotitanium(IV) compounds. Molecular and crystal structure of peroxobis(picolinato)(hexamethylphosphoric triamide)titanium(IV)Hubert Mimoun, Michele Postel, Francis Casabianca, Jean Fischer, and Andre MitschlerCite this: Inorg. Chem. 1982, 21, 4, 13…
Abstract Pyrrole reacted with potassium persulfate in aqueous media to form polymers or “pyrrole blacks.” The structure and molecular weight depend on the initial pyrrole/K 2 S 2 O 8 ratio. An ESR line due to trapped electrons or free radical ions appeared at g = 2.0036 (width 3.6 G) in all products and its intensity…