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The influence of chromium on self-diffusion of cations in metal-deficit man-ganous sulphide, Mn1_yS, has been studied as a function of temperature and sulphur activity, using radio-tracer technique. It has been found that the rate of Mn self-diffusion in chromium doped Mn1_yS is higher than that in pure manganous sulphide and does not depend on equilibrium sulphur pressure. In addition, the activation...
A series of novel dinuclear mixed-ligand complexes having the general formula [M(2)(tpt)(L)(4]Cl(4)nH(2)O where M = Ni(II), Co(II) or Cu(II); tpt = 2,4,6-tris(2-pyridyl)-l,3,5-triazine; L = dithiooxamide (dto) or thiosemicarbazide (tsc); n = 2 — 4, have been synthesized and characterized. The tpt molecule is flexidentate, where it can behave as di- or tridentate and either mono- or dinucleating ligand...
Quantum mechanical ab initio calculations have been performed at various levels of theory to study kinetics of the reactions of fluorine, chlorine and bromine atoms with trifluoromethanol. Total energies were improved by using Gaussian-2 (G2) methodology. It is shown that the considered reactions proceed with formation of intermediate complexes. The mechanism of the reactions studied appears to be...
A methodology for characterizing the phase composition of aggregates floating inside an industrial separation cell (based on the Luba Tube Sampling Technique, LTST) is presented. The LTST enables observation and recording of phenomena occurring inside a processing vessel by guiding a flux of floating aggregates into the tube, and monitoring them above the edge of the separation vessel. Aggregate sizes...
The thermal decomposition of tin(II), lead(II), cadmium(II) and mercury(II) metal-alginate complexes has been studied using thermogravimetry (TG) and differential thermogravimetry (DTG) measurements. The TG curves showed three stages of weight loss, the DTG curves indicated the presence of a series of thermal stages associated with the TG curves. Dehydration of the coordinated water molecules occurred...
The second order nonlinear optical coefficient dsg of potassium hydrogen bis-trichloroacetate molecular crystal is theoretically predicted by the chemical bond method, which shows that optical responses of this crystal originate from the C-C1 bonds. The predicted value of d(36) is in agreement with the experimental observation.
The titration Omega MicroCal microcalorimeter (ITC) was used to obtain the enthalpy changes accompanying dilution of buffer solutions of lysozyme. Titration calorimetry affords a convenient method for the estimation of enthalpic pairwise solute-solute interaction parameters (hxx}- In this paper the results of determination of the enthalpy of dilution and then evaluated pair interaction coefficients...
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