• R A Yadav

      Articles written in Journal of Chemical Sciences

    • Vibrational spectra and normal coordinate analysis for substituted trifluoromethyl benzenes

      R A Yadav I S Singh

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      The polarised Raman spectra of the three isomeric trifluoromethyl benzonitriles have been recorded in the region 50–4000cm−1. The near and farir spectra of these compounds have been recorded in the region 200–4000 cm−1 and 33–700 cm−1 respectively. To check the vibrational assignments normal coordinate analysis was performed using general valence force field. Very good agreement has been achieved between the observed and the calculated fundamental frequencies. It has been possible to resolve the controversies about the assignments of the C-CF3 stretching and CF3 symmetric stretching modes in substituted trifluoromethyl benzenes. Vibrational assignments together with the force fields for three isomers are reported for the first time.

    • Vibrational studies of biomolecules. I. 2-Thiouracil

      R A Yadav P N S Yadav J S Yadav

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      IR, far-IR and Raman spectra of 2-thiouracil are reported and interpreted. All the thirty normal modes could be assigned. The Raman spectrum and the vibrational assignments for all the thirty modes are reported for the first time. The ring breathing and Kekule stretching modes for 2-thiouracil are observed to have lower magnitudes when compared to those for uracil which could be due to the mass effect of the sulphur atom in place of the oxygen atom.

    • Raman scattering in magnetic materials

      R A Yadav

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      The new selection rules formulated for gyrotropic materials in presence of the Faraday Rotation by earlier workers are critically examined in the light of the work of Slobodyanyuk and Schaack. It is argued that it is difficult to distinguish between the two effects, namely, the position dependence (size effect) and phase dependence (interference effect) causing intensity anomalies in Raman scattering.

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