Structure of chlorobis(N-methylsalicylideneiminato)oxorhenium(V)
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Transmission Electron Microscopy of Shear Band Formation in Rolled Copper Single Crystals
The deformation structure of (211)[\bar111] copper single crystals rolled at room and liquid nitrogen temperatures (RT and LNT) was observed by transmission electron microscopy, and the microstructural process of shear band nucleation was examined. The microstructure prior to the shear band nucleation was composed of…
Rate constant and possible pressure dependence of the reaction hydroxyl + hydroperoxo
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRate constant and possible pressure dependence of the reaction hydroxyl + hydroperoxoW. B. DeMoreCite this: J. Phys. Chem. 1982, 86, 1, 121–126Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1 January 1982https://pubs.a…
Cu2O and CuCl2·3Cu(OH)2 corrosion products on copper rich dental amalgams
In addition to Sn-rich corrosion products found in conventional amalgams, Cu-rich amalgams also form Cu-containing corrosion products. The nature of these Cu-rich products was investigated by immersion of samples of 13 Cu-rich amalgam systems in Ringer's solution for prolonged periods. SEM/EDS and x-ray diffraction st…
Electronic properties of polymers. Anisotropic light absorption and photoelectron emission of oriented polyethylene films in the vacuum ultraviolet region
Anisotropic optical absorption of oriented ultrathin films, (down to 50 nm thickness) of low density polyethylene (LDPE) was measured in the vacuum ultraviolet (VUV) region between 6 and 12 eV. Clear anisotropy was found in the observed spectra. The lowest-energy absorption feature at 9 eV was polarized perpendicular…
Undulation instability under shear in smectic A liquid crystals
We study the undulation instability in a smectic A in the presence of shear flow parallel to the layers. We look for the dilation at the threshold where an undulation appears with a wave vector inclined at an angle θ to the direction of flow. We find an integral relation showing that the dilation is necessarily positi…
Photochemistry of manganese porphyrins. Part 6. Oxidation–reduction equilibria of manganese( III ) porphyrins in aqueous solution
Water-soluble manganese(III) porphyrins are oxidised in alkaline aqueous solution to the corresponding manganese(IV) porphyrins which, from magnetic moment measurements, appear to exist in solution as µ-oxo-dimers. Midpoint potentials and rate constants for oxidation of the manganese(III) porphyrins have been measured…
Relative electron-donating ability of simple alcohol radicals toward 12-heteropolytungstates. A pulse radiolysis study
The pulse-radiolysis technique has been used to study the reaction of one-electron reducing radicals [CH2OH, CH3ĊHOH and (CH3)2ĊOH] with a series of heteropolytungstates, [PW12O40]3–, [SiW12O40]4–, [FeW12O40]5– and [H2W12O40]6–, to produce the corresponding one-electron reduction products.A gradual decrease in rate co…
Platelet-compatible hydrophilic segmented polyurethanes from polyethylene glycols and cyclohexane diisocyanate.
A new type of segmented polyurethane (SPU) was synthesized from alpha, omega polyethylene oxide diols (PEG) of MW varying from 600 to 4500, by end capping with 1,4 trans cyclohexane diisocyanate (CHDI) and chain extending with ethylene diamine (ED) in toluene with dibutyl tin dilaurate as catalyst. These SPU are cast…
Influence of electron concentration on the hydrogen absorption by RM5Haucke compounds
Analysis of the electronic specific heat constant for some Y(Ni,Al) 5 , La(Ni,Al) 5 , La(Ni,Cu) 5 and Th(Ni,Al) 5 alloys suggests that the amount of hydrogen absorbed in excess of 3 H atoms per RM 5 formula unit (0.5 H atom per metal atom) by the RM 5 phases depends upon the number of unpaired 3d nickel electrons. The…
Sialon tool materials
Sialons are phases in the Si–Al–Q–N and related systems that are built up of (Si, Al)(O, N)4 tetrahedra in the same way that the structural unit in the silicates is the (Si, Al)O4 tetrahedron. These new materials include nitrogen-containing ceramics, glasses, and glass-ceramics but only β’-sialon, the silicon-aluminiu…
Influence of electrostatic forces upon the efficiency of charge separation for the zinc porphyrin/methyl viologen system
The bimolecular rate constant for quenching the triplet excited state of a metalloporphyrin by methyl viologen depends upon the electronic charge on the porphyrin ring. The rate constant increases with increased electrostatic attraction between the reactants and this is due to efficient formation of an encounter compl…
Synthesis and Characterisation of Metal Hydrazine Nitrate, Azide and Perchlorate Complexes
Metal hydrazine nitrate complexes of the type M(N2H4)Nn (NO3)2 where M = Mg, n = 2; M = Mn, Fe, Co, Ni, Zn and Cd and n = 3; metal dihydrazine azide complexes of the type M(N2H4)2 (N3)2 where M = Mg, Co, Ni and Zn; and Mg(N2H4)2 (C1O4)2 have been prepared by dissolving the respective metal powders in the solution of c…
Phosphate coupling agents for calcium carbonate filler
Phosphate coupling agents, i.e., alkyl dihydrogenphosphates containing functional groups such as olefinic, chloro, methacryloxy, and mercapto, were synthesized and allowed to react with calcium carbonate filler suspended in an aqueous medium. The modification provided the filler with good dispersibility in mineral oil…
Molecular structure of a mixed-valence isopolyvanadate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular structure of a mixed-valence isopolyvanadateAvi Bino, Shmuel Cohen, and Carla Heitner-WirguinCite this: Inorg. Chem. 1982, 21, 1, 429–431Publication Date (Print):January 1, 1982Publication History Published online1 May 2002Published inissue 1 January 1982https://pu…
Determination of the Charge Character of Selected Acid Soils
Abstract The components of the exchangeable cation suite and its degree of domination by aluminum (Al) are prerequisites for lime requirement determinations based on percent Al saturation. The usefulness of these data is enhanced if the determinations are made under conditions which approximate those of the “field” en…
Wear of Rail and Tire Steels Under Rolling/Sliding Conditions
Prediction of the wear rate of rails on curves is becoming an increasingly important requirement as maintenance costs rise. One possible method of achieving this aim is to relate wear behavior to contact forces and creepages which can be evaluated using existing theoretical analyses of wheel/rail contact. Such a relat…
Dicopper( II ) complexes of a macrocyclic ligand containing single hydroxo-, methoxo-, or 1,1-azido-bridges: synthesis, magnetic properties, electron spin resonance spectra, and the crystal and molecular structure of a µ-hydroxo-derivative
Reaction of 2,6-diacetylpyridine with 1,3-diaminopropane in methanol in the presence of M[ClO4]2(M = SrII or BaII) in 2:1:1 molar proportions yields the complexes [ML2(ClO4)2] of the new 20-membered macrocyclic tetraimine ligand L2 derived from the [2 + 2] condensation of 2 mol of diketone with 2 mol of diamine. The s…
Crystal structure of tetrakis(trimethylsilyl)ethylene at -70.degree.C
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure of tetrakis(trimethylsilyl)ethylene at -70.degree.CHideki Sakurai, Yasuhiro Nakadaira, Hiromi Tobita, Tasuka Ito, Koshiro Toriumi, and Haruko ItoCite this: J. Am. Chem. Soc. 1982, 104, 1, 300–302Publication Date (Print):January 1, 1982Publication History Pu…
Pulsed irradiation of water-soluble porphyrins
Nanosecond laser flash photolysis and pulse radiolysis have been used to characterise the excited states and radicals of meso-tetraphenylporphyrin tetrasulphonic acid as the tetrasodium salt (Na4TPPS) and of meso-tetra-N-methylpyridylporphyrin as the tetra-p-toluenesulphonate (TMPyrP). After 347 nm irradiation, aqueou…