Spectroscopic evaluation of the specific heats of potassium bromideRaman, C.
doi: 10.1007/BF03046312pmid: N/A
The spectrum of free vibrations of the structure of potassium bromide is determined spectroscopically from the scattering within the crystal of the resonance radiation of the mercury arc. The modes are recorded with doubled frequency shifts. The identification of these shifts as arising from the various modes of vibration is made on the basis of the frequencies as computeda priori from the dynamic theory and from a consideration of their observed spectral intensities. From these spectral frequencies, the specific heat of the crystal can be evaluated as a function of the temperature. When the variations with temperature of the vibration frequencies are taken into account, a satisfactory agreement emerges between the theoretically computed and experimentally observed specific heat data.
Kinetics of the olefine-bromine reactionAnantakrishnan, S.; Mathai, I.
doi: 10.1007/BF03046313pmid: N/A
A complete analysis of the work on the addition of bromine ethylene derivatives under varying conditions of structure, solvent and temperature brings out the composite nature of the reaction. With the Roberts-Kimball postulate as the starting-point, it is found that the variations in reaction order can be readily understood from the variations in the importance of the rate determining step. A mechanism incorporating all the details is presented.
The apparent dipole moments of certain substituted biphenylsDevanathan, T.
doi: 10.1007/BF03046314pmid: N/A
The apparent electric dipole moments ofo-hydroxy biphenyl,o-methoxy biphenyl andpp′-dihydroxy biphenyl have been determined. The values serve to point to the following structural features: (1) Ino-hydroxy biphenyl the two benzene rings seem to be orthogonal and there seems to be an interaction between the proton of the —OH group and theπ-electrons of the unsubstituted benzene ring. (2) Ino-methoxy biphenyl the two benzene rings seem to be slightly tilted from the coplanar conformation. (3) Inpp′-dihydroxy biphenyl the two benzene rings seem to be coplanar.
Geochemical studies in the uranium prospect at Umra, RajasthanTilak, V.; Aswathanarayana, U.
doi: 10.1007/BF03046315pmid: N/A
With the objective of investigating the geochemistry of the natural waters of the uranium prospect at Umra, Rajasthan, the concentrations of uranium, nickel, cobalt, copper, vanadium, etc., in the natural waters have been determined and their distribution patterns have been interpreted in the light of the geology of the area, the climatic and hydrological conditions prevalent there and the geochemical behaviour of the elements concerned. It is found that there is a marked contrast in the uranium content of winze and well-waters. The presence of copper in waters despite their high pH is ascribed to the tendency of copper to form colloidal suspension of basic carbonates. The observation, that vanadium is present in the secondary uranium-vanadium minerals but is absent in the waters, could be explained in the light of the geochemical behaviour of the element. The concentration of cobalt in most of the water samples and its absence in some is traceable to the controlling effect of pH on the mobility of cobalt. Nickel in waters might have been ‘scavenged’ and absorbed on hydrated iron oxides, which explains the absence of nickel in waters. Mention is made of the health hazard involved in drinking water from one of the wells with high content of uranium.
Synthesis of 1-α-vinyl-1-β-hydroxy-5-oxo-7a-methyl-2, 3, 5, 6, 7, 7a-hexahydroindeneSwaminathan, S.; John, Joseph; Venkataramani, P.; Viswanathan, K.
doi: 10.1007/BF03046316pmid: N/A
The synthesis of the title compound (VIII) by selective ethynylation of 1, 5-Dioxo-7a-methyl-2, 3, 5, 6, 7, 7a-hexahydroindene (VI) followed by reduction is described.