Composition of Chromate Passivation Films on Aluminum‐Zinc Alloy‐Coated Sheet Steel
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The XPS valence band of chromium
The X-ray photoemission (XPS) spectra of the valence band and 2p core lines of metallic chromium are presented. A considerable deviation is observed in the shape of the valence band between the experimental spectrum and the theoretical one-electron spectrum. This discrepancy is mainly due to the d band being too broad…
Lattice Conversion of Cellulose in Wood
When peracetylated wood, prepared in an acetic anhydride-pyridine medium, was saponified and recrystallized, almost no conversion of cellulose I to cellulose II took place. Neither was conversion detected, when thirteen species of wood, differing in density from 0.17 to 0.71, as well as in lignin content from 18.1 to…
Synthesis of graft copolymers having hydrophobic backbone and hydrophilic branches by phase transfer catalysis
Abstract Polystyrene‐oligoacrylamide graft copolymer was synthesized by the esterification between chloromethylated polystyrene and carboxyl group terminated acrylamide oligomers using phase transfer catalyst such as tetrabutylammonium chloride in toluene‐ and/or DMF/water. The graft copolymers having hydrophobic back…
Optical absorption and ESR spectra of monomeric rhodium(II) tetraphenylporphyrin in 2-methyltetrahydrofuran solution at 77 K
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…
The Infrared, Raman, Resonance Raman Spectra, and the Valence Force Field of the HfS3 Layer‐Type Compound
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 +…
Heteroaromatic Azo Dyes Exhibiting Negative Dichroism in Liquid Crystals
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…
Influence of Some Chemical and Mechanicaleffects on XLPE Degradation
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…
Protonation of the methyl orange derivative of aspartate adsorbed on colloidal silver: a surface-enhanced resonance Raman scattering and fluorescence emission study
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…
KINETIC AND THERMODYNAMIC CONTROL OF ASYMMETRIC INDUCTION BY CHIRAL DIPHOSPHINE IN RING CONTRACTION OF (CHIRAL DIPHOSPHINE)NiCH2CH2CH2COO TO (CHIRAL DIPHOSPHINE) NiCH (CH3)CH2COO
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…
Neues über Oxoferrate(III). I. Zur Kenntnis von Li5FeO4 [1] Mit einer Notiz über Mischkristalle Na5Fe1−xGaxO4
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…
COLLECTION OF FOOD BY ORAL SURFACE PODIA IN THE SAND DOLLAR,ECHINARACHNIUS PARMA(LAMARCK)
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…
NMR study of the electronic state and Peierls transitions in NbSe3
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…
Reactions of Fe2+ and Fe3+ with Calcite
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…
Comparative X-ray and Dielectric Studies on Some Structurally Related Smectogenic Compounds
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…
NEOLAURALLENE, A NEW HALOGENATED C-15 NONTERPENOID FROM THE RED ALGA LAURENCIA OKAMURAI YAMADA
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.
Moessbauer 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. 1A1 transition, particle size effects and related phenomena
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.…
The Diatom Flora of the Swan River Estuary Western Australia
No abstract available.
Europium(III) luminescence excitation spectroscopy. A species-specific method for the quantitation of lanthanide ion binding to chelating agents. Complexes of (1,2-ethanediyldioxy)diacetate
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.…
Authigenic chlorites: problems with chemical analysis and structural formula calculations
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…