Materials Literature
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Dielectric constants of pseudo-hexagonal c -plates of Rb 3 H(SeO 4 ) 2 and Rb 3 D(SeO 4 ) 2 were measured below room temperature. The dielectric constant of Rb 3 H(SeO 4 ) 2 monotonically increases with decreasing temperature down to liquid helium temperature. On the other hand, that of Rb 3 D(SeO 4 ) 2 shows a λ-type…
Abstract Second harmonic generation in the ferroelectric smectic C phase of i‐amyl‐4‐[4‐decyloxybenzylideneamino]‐cinnamate (DOBAMBC) is studied. Its dependences on temperature and external electric field are measured. A considerable effect of orientational fluctuations is pointed out.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation, x-ray crystal structures and vibrational spectra of some salts of the arsenic-sulfur (As3S4+) and arsenic-selenium (As3Se4+) cationsBeverley H. Christian, Ronald J. Gillespie, and Jeffery F. SawyerCite this: Inorg. Chem. 1981, 20, 10, 3410–3420Publication Date (…
Abstract The electrical and optical properties of the four charge-transfer salts formed between the two donors tetrathiafulvalene (TTF) and dibenzotetrathiafulvalene (DBTTF) and the two acceptors tetracyanoquinodimethan (TCNQ) and 2,3-dichloro-5,6-dicyano-p-benzoquinone (DDQ are compared. The differences are rationali…
Abstract Der Azidoligand in der Koordinationssphäre der Chrom(III)‐Komplexe wird bei Einstrahlung von Licht der Wellenlänge 313 nm in einen Nitridoliganden umgewandelt. Diese photochemische Reaktion wurde für die Darstellung des Nitrido‐N, N′‐ethylen‐bis(salicylaldiminato)‐Chrom(V)‐Komplexes benutzt, der durch Element…
Abstract Tetrabutylammonium salts of 12-heteropolytungstates with central transition metal ions in a tetrahedral oxygen environment, MW12O40 (M=CuII, FeIII, CoII), have been prepared and their spectroscopic data (infrared (IR), near-infrared, UV-vis, and magnetic circular dichroism (MCD)) presented.
Abstract The photothermal oxidation of thermoplastic polyurethane elastomers was studied, observing the behaviour of four types of model polymers based upon various hard segments (aromatic or aliphatic) and various elastomeric phases (polyether or polyester). Four types of hydroperoxy groups were observed. By chemical…
Abstract The solid‐state viscoelastic properties of polystyrene containing randomly distributed groups of styrene‐ p ‐sodium sulfonate are studied and compared with the corresponding properties of copolymers of styrene and sodium methacrylate (S‐NaMA). The viscoelastic behavior in the primary transition region of thes…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSinglet .dblharw. quintet spin transitions of iron(II) complexes with a P4Cl2 donor set. X-ray structures of the compound FeCl2(Ph2PCH:CHPPh2)2 and of its acetone solvate at 130 and 295 KF. Cecconi, M. Di Vaira, S. Midollini, A. Orlandini, and L. SacconiCite this: Inorg. Che…
Abstract An XPS analysis of a ferricyanide accelerated chromate paint pretreatment film found iron in the form of both a ferricyanide and a ferrocyanide ion. Chromium occurred in at least two different chemical environments, one of which was as a hydrated oxide. Aluminium and fluorine probably occurred together althou…
Symmetries of domain pairs and domain twins are described by black & white space and layer groups, resp. Domain walls (DW s) are represented by paths in order parameter space which determine their structure and symmetry. Symmetry aspects of phase transitions of DW s, lattice pinning of DW s and some properties of DW l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlash photolysis study of the metal-metal bond homolysis in dimanganese decacarbonyl and dirhenium decacarbonylR. W. Wegman, R. J. Olsen, D. R. Gard, L. R. Faulkner, and Theodore L. BrownCite this: J. Am. Chem. Soc. 1981, 103, 20, 6089–6092Publication Date (Print):October 1,…
The secondary-electron yield from polycrystalline copper induced by protons, noble-gas ions, and copper ions has been studied as a function of angle of ion incidence in the range 0\ifmmode^\circ\else\textdegree\fi{} to 85\ifmmode^\circ\else\textdegree\fi{}. The experimental results are explained in terms of a recently…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and reactivity of an anionic tetrairon nitrido cluster. Crystal and molecular structure of bis(triphenylphosphin)iminium [dodecarbonylnitridotetraferrate]Douglas E. Fjare and Wayne L. GladfelterCite this: Inorg. Chem. 1981, 20, 10, 3533–3539Publication Date (Print)…
A specific fibril model is presented consisting of bundles of five-stranded microfibrils, which are usually disordered (except axially) but under lateral compression become ordered. The features are as follows (where D = 234 residues or 67 nm): (1) D-staggered collagen molecules 4.5 D long in the helical microfibril h…
Abstract An ab initio LCAO SCF MO calculation was performed on planar Fe‐porphine with a double zeta basis set consisting of 300 CGTO 's. SCF wave functions of several states of Fe‐porphine and its cation were obtained. The net charge of Fe is in the range of 1.39 to 1.53. The highest occupied orbital is ascertained t…
Abstract Free volume fraction of the Williams‐Landel‐Ferry(WLF)‐Doolittle type has been applied to the analysis of the nonequilibrium state for the glassy polymers. The free volume fraction is a two parameter variable since it depends on the free volume and the occupied volume. The excess entropy is derived from the m…
The heat capacity of poly(oxymethylene), poly(oxyethylene), poly(oxytrimethylene), poly(oxytetramethylene), poly(oxyoctamethylene), poly(oxypropylene), Poly(oxymethyleneoxyethylene), poly(oxymethyleneoxytetramethylene), poly(oxy-1,4-phenylene), poly(oxy-2,6-dimethyl-1,4-phenylene), ploy(oxy-2,6-diphenyl-1,4-phenylene)…
Abstract A comprehensive model for a semibatch ester interchange reactor has been developed with a view to investigate the effect of various process and operational variables on the DMT conversion rate as well as the by‐product formation. The influence of important variables such as EG‐to‐DMT ratio, catalyst concentra…
Experimental evidence indicates that up to 90% of all hydrogen is generated at the metal/oxide interface during the corrosion of carbon and low alloy ferritic steels by high temperature water, in the absence of oxygen. None of the presently accepted mechanisms are able to account for this observation. After considerat…