• V B Kartha

      Articles written in Journal of Chemical Sciences

    • Laser Raman spectra and free and restricted rotation in phenyl silicates

      M N Dixit N S K Prasad V B Kartha

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      Tetraphenyl silicate and related phenyl-alkyl silicates, an interesting class of compounds with applications in high vacuum technology, belong to the class of non-rigid molecules where free or restricted internal rotation of the substituent phenyl and alkyl groups provide several possible relative orientations. This may result in the formation of different phases under different conditions, providing results of fundamental interest in molecular dynamics. We have recently studied the laser Raman and infrared spectra of some of these compounds including tetraphenyl, phenyl triphenoxy, alkyl triphenyl, diphenyl dialkyl, phenyl trialkyl, and tetra alkyl silicates. Changes are observed in the spectra of these molecules with temperature, and these indicate the onset of restricted rotation at lower temperatures. These spectral changes and assignments are discussed in the paper.

    • Laser Raman and infrared studies on hydrotropes and related materials

      S B Kartha V G Gaikar M M Sharma V B Kartha

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      Hydrotropes, which are molecules used as solubilising agents in aqueous systems, are closely related to surfactants and micelles in many of their properties. Information on the aggregation of these molecules in aqueous systems and their interaction with other molecules in solution, can be obtained conveniently by laser Raman Spectroscopy. In the present paper Raman spectral studies on the hydrotrope sodium butyl monoglycol sulphate (NaBMGS), is presented and discussed with reference to spectral changes in solution and interaction with probe molecules.

    • Laser Raman spectroscopic studies on the interaction of drug Dapsone with model membranes

      V B Kartha N D Patel S Venkateswaran

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      Amphiphilic molecules like model membranes exhibit several special properties because of their ability to undergo co-operative aggregation in aqueous systems. The special properties of such aggregates have made them very important in several applications in industry, basic sciences and advanced technology. To understand the interaction of these systems at a molecular level it is necessary to study several processes. Laser Raman spectroscopy is a convenient technique for gaining information at a molecular level on such systems. In the present paper the applications of laser Raman spectroscopy for the study of these systems are discussed with particular reference to the changes in conformation, identification of structural groups involved in various interactions, arrangement or packing of the amphiphiles in the solid, gel or solution phase, and the effect of additives.

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