Five coordination in 3d metal complexes
Abstract
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Mechanism of Branching and Kinking during VLS Crystal Growth
The morphology of the solid‐liquid interface and the contact angle configuration of the liquid alloy droplet determine the direction of growth of crystals prepared by the vapor‐liquid‐solid (VLS) technique. There are four different processes by which both growth kinks and branches can be formed. A change in solid‐liqu…
Effect of temperature on the dielectric relaxation in polycrystalline ferrites
Abstract The dielectric constant and the conductivity of polycrystalline ferrites are measured at temperatures between 100 and 400°K and at various frequencies. Different activation energies are obtained for the d.c. and the h.f. conductivity of the samples. Both positive and negative temperature coefficients of the c…
Ultra-violet absorption spectrum of isocyanic acid
The absorption spectrum of HNCO between 2000 and 2800 Å has been photographed with high resolution and absorption paths of up to 8 m atm. None of the bands are completely sharp, but many show coarse rotational structure. Long progressions of bands are assigned to excitation of an NCO bending vibration. The rotational…
Formation of and interrelation between some .mu.-peroxo binuclear cobalt complexes. II.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation of and interrelation between some .mu.-peroxo binuclear cobalt complexes. II.Masayasu Mori, John A. Weil, and Mibuo IshiguroCite this: J. Am. Chem. Soc. 1968, 90, 3, 615–621Publication Date (Print):January 1, 1968Publication History Published online1 May 2002Publis…
Size and Shape of Montmorillonite Particles Saturated with Na/Ca Ions (Inferred from Viscosity and Optical Measurements)
Abstract The viscosity and light transmittance of montmorillonite suspensions saturated with Na + , Ca ++ and known mixtures of these ions in the adsorbed phase were investigated. Introduction of a small fraction of Na + (10% – 15%) into the exchange complex of Ca—clay, does not result in the breakdown of the tactoids…
Infrared and Raman spectra of inorganic compounds
H. E. Hallam, R. Inst. Chem., Rev., 1968, 1, 39 DOI: 10.1039/RR9680100039
Chemistry of soil minerals. Part V. Low temperature hydrothermal transformations of kaolinite
Raw kaolinite has been investigated as a possible starting material for low-temperature hydrothermal growth of zeolites and felspathoids. It proved to be convenient and versatile in this role, being readily transformed into a range of known and new zeolites and salt-inclusion felspathoids with a Si/Al ratio around 1·0…
Optical Absorption by Polarons in Rutile (TiO2) Single Crystals
Abstract The optical absorption in rutile single crystals doped with Nb and other impurities as well as partially reduced is investigated in the temperature range 10 to 900°K. It is shown that the spectrum and the magnitude of the optical absorption by current carriers can be satisfactorily explained in terms of the s…
The electronic properties and stereochemistry of the copper(II) ion. Part III. Some penta-ammine complexes
The electronic, e.s.r., and i.r. spectra, and some magnetic moments of a number of stable penta-ammine complexes of the copper(II) ion are reported. The spectra are shown to be consistent with a square-based pyramidal configuration for the Cu(NH3)52+ cation, but not consistent with a trigonal bipyramidal configuration…
Particle Size and Optical Properties of Montmorillonite in Suspension
Abstract The light absorption spectra of monoionic montmorillonite suspensions with Li, Na, K, Rb, NH 4 , Cs, Mg, Ca and Ba as adsorbed ions were studied in the wavelength range 200–800 mμ. Theoretical analysis of the spectra showed that in the visible range, only scattering is responsible for light intensity attenuat…
Electrical properties of linear polyacetylene
Linear polymer of acetylene was prepared in which the oxygen content was as low as 0.7 %. The electrical conductivity and Seebeck voltage but not the energy gap depended on the extent of oxidation of the samples. Adsorbed donor and acceptor gases affected electrical conductivity but not e.s.r. spin assay. It was concl…
The Measurement of Surface Charge
A new method of measuring the charge density on a dielectric surface has been developed. An electrode is vibrated in the surface field to produce a signal that is displayed on an oscilloscope, or measured with a VTVM. A bias is then applied across the vibrating and fixed electrodes sufficient to produce zero output si…
The Nucleation, Growth, and Structure of Thin Ni-P Films
The nucleation, early growth, and structure of Ni‐P on SnCl 2 ‐ PdCl 2 activated dielectric substrates were studied. The SnCl 2 ‐ PdCl 2 treatment was found to provide small catalytic sites on the substrate, serving as the nuclei for Ni‐P growth. The average diameter of catalytic sites was estimated to be less than 10…
cis-Dioxo- and trioxo-complexes
Raman and infrared spectra have been measured of a number of transition-metal complexes of the form [MO2X4]n–(M = MoVI, WVI, or VV; X = F, Cl, or ½ Ox), and a cis configuration of the oxygen ligands has been found for these d0-species. The results are compared with those obtained for trans-dioxo-complexes and the díff…
Metastable Immiscibility in the B2O3–SiO2 System
Using the phase diagram and a simple solution model, a subliquidus miscibility gap was estimated for the B 2 O 3 ‐SiO 2 system. The predicted coexistence boundary, showing a consolute temperature of 520°C, was flat and symmetrical and extended across the complete binary. Gradient furnace heat treatments of selected co…
Characterization of Chloramphenicol Acetyltransferase from Chloramphenicol-resistant Staphylococcus aureus
Chloramphenicol-resistant strains of Staphylococcus aureus contain an inducible enzyme which inactivates chloramphenicol by acetylation in the presence of acetyl coenzyme A. The products of acetylation are chromatographically indistinguishable from those obtained with chloramphenicol-resistant Escherichia coli harbori…
ESR Studies of Cupric Ion in Various Oxide Glasses
Abstract ESR spectra of cupric ions in borate, silicate, and phosphate glasses were analyzed by the LCAO MO method of Maki and McGarvey. The covalency of the B 2g π‐orbital was found to change with the bond strength of the network‐former. Particularly it reflected clearly the weakening of BO bonds in alkali borate gl…
A Study of Radiation Effects on SiO2 and Al2O3 Layers Using Thermoluminescence Glow Curve Techniques
Trap levels in thin layers (500 to 6000Å) of Al2O3 and various types of SiO2, all on Si substrates, were investigated using thermoluminescence glow curves in a temperature range from 30° to 300°C. Layers were studied which had been exposed to doses of Co60-gamma radiation up to several Mrads. Previously unirradiated S…
The Low‐Temperature Thermoelectric Power and Thermal Conductivity of GeTe and of Some GeTe‐MnTe Alloys
Abstract A method of preparation has been developed which allows the growth of large homogeneous single phase ingots of such alloy systems as GeTe‐MnTe, GeTe‐SnTe, etc. … We have measured the thermoelectric power and the thermal conductivity of both GeTe and two alloys of the system Ge 1− x Mn x Te, in the temperature…