Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOptical absorption and ESR spectra of monomeric rhodium(II) tetraphenylporphyrin in 2-methyltetrahydrofuran solution at 77 KMikio Hoshino, Katsutoshi Yasufuku, Shiro Konishi, and Masashi ImamuraCite this: Inorg. Chem. 1984, 23, 13, 1982–1984Publication Date (Print):June 1, 1…
Abstract The infrared and Raman spectra (600 to 10 cm −1 ) of polycrystalline samples and of single crystals of HfS 3 are investigated. A complete assignment is proposed and the frequencies of normal modes in HfS 3 , ZrS 3 , and TiS 3 are compared. Resonance Raman spectra of HfS 3 are recorded using a variety of Kr +…
Scientists working in the field of liquid crystals have become increasingly interested in the practical applications of dichroic dyes dissolved in liquid crystal matrices. This interest is due to a number of factors. Firstly an improved contrast of an image can be achieved in displays using this “guest-host” effect in…
It is shown that the relatively large concentration of impurities in cables is even higher in water trees. Gas bubbles observed in cavities filled with different salt solutions generate very high pressures able to fracture XLPE samples. It was also observed that fracture in XLPE under a cyclic mechanical load is frequ…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProtonation of the methyl orange derivative of aspartate adsorbed on colloidal silver: a surface-enhanced resonance Raman scattering and fluorescence emission studyOlavi Siiman and Adam LeppCite this: J. Phys. Chem. 1984, 88, 12, 2641–2650Publication Date (Print):June 1, 198…
Abstract An (S,S)-CHIRAPHOS-coordinated six-membered ring complex NiCH2CH2CH2COO undergoes facile ring contraction to give a mixture of ((S,S)-CHIRAPHOS)-(R)-NiCH(CH3)CH2COO (2a) and ((S,S)-CHIRAPHOS)-(S)-NiCH(CH3)CH2COO (2b). Complex 2a is kinetically favored, whereas 2b is thermodynamically favored; a thermodynamica…
Abstract Erstmals werden von Li 5 FeO 4 , gemäß Li 5 □ 2 FeO 4 eine geordnete Variante des Na 2 O‐Typs, dunkelgelbe, wasserklar durchsichtige Einkristalle [aus Gemengen von Li 2 O und α‐NaFeO 2 mit Li: Na: Fe = 6:1:1, geschlossenes Ag‐Bömbchen, 700°C, 16 d] dargestellt, die mit Li 5 GaO 4 isotyp sind: a = 921,8(1), b…
In Echinarachnius parma all spine types have cilia arranged in two bands along the shaft. Ciliary currents flow perpendicular to these bands and reversals were not observed. On the aboral surface the bands of cilia were oriented perpendicular to lines radiating from the apex. Flow visualization using dyes and particle…
93 Nb relaxation time (T 1 ) measurements have been carried out in the linear chain metal NbSe 3 . The characteristic temperature dependence of T 1 when passing through the Peierls transition temperatures provides evidence for independent CDW formation in two of the three inequivalent columns of distorted prismatic ca…
Abstract Ferrous or ferric Perchlorate, 0.01 M, was reacted with calcite in stirred aqueous suspensions which were bubbled vigorously with an oxidizing purge gas. Two and three equivalents of CaCO 3 were dissolved per mole of Fe 2+ and Fe 3+ neutralized, respectively. With Fe(ClO 4 ) 2 , the crystalline Fe oxide produ…
In continuation of our earlier work on smectogenic compounds exhibiting large bilayer spacings, we report in this paper a comparative study of several compounds with lateral methyl or methoxy substituent. Some of the compounds do not have any strongly polar end groups while others have a cyano end group. The dielectri…
Abstract The structure and the absolute configuration of a new C-15 bromoallene, which has been isolated from the red alga Laurencia okamurai Yamada, were confirmed by X-ray crystallographic analysis.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMoessbauer effect and x-ray diffraction at the high-spin (5T2) .dblharw. low-spin(1A1) transition in bis(thiocyanato)bis(4,7-dimethyl-1,10-phenanthroline)iron(II)-.alpha.-picoline: thermal hysteresis, associated crystallographic phase change, time dependence of 5T2 .fwdarw.…
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEuropium(III) luminescence excitation spectroscopy. A species-specific method for the quantitation of lanthanide ion binding to chelating agents. Complexes of (1,2-ethanediyldioxy)diacetateMichael Albin, Gregory K. Farber, and William DeW. Horrocks Jr.Cite this: Inorg. Chem.…
Abstract Analytical transmission electron microscopy was applied to some authigenic chlorites occurring as grain coatings in sandstones. Compositional variation proved to be relatively slight: all were magnesian chamosites. The coating chlorites were often intimately mixed with extremely fine-grained (0·01–0·2 µ m) he…
The propensity of thermally stabilized Inconel 600 to undergo low temperature stress corrosion cracking (SCC) in sulfur bearing environments has been investigated with U-bends and slow strain rate testing. The results have been compared with those of sensitized Inconel 600. The potential dependence of crack propagatio…
Gas phase core and valence electron spectra from UF6, excited by AlKα monochromatized x rays, in the binding energy range 0–1000 eV are presented. It is shown that the AlKα excited valence electron spectrum can be used to reassign the highest occupied molecular orbital (HOMO) in UF6. Many-body effects on the core leve…
Abstract Measurements of the dielectric constant and loss factor of polyvinyl chloride (PVC) have been made over a wide range of temperature and frequency. Maxima in dielectric loss were observed at a temperature corresponding to the α or glass transition temperature and secondary β transition temperature. The sensiti…
We present band structure calculations on neutral polypyrrole. The calculations are performed at the Hartree–Fock ab initio level with the use of a program specifically adapted for polymer applications. The density of states computed from the band structure compares very well with the UPS data on neutral polypyrrole.