• S D Pradhan

      Articles written in Journal of Chemical Sciences

    • Thermodynamic study of binary mixtures of isomeric butylamines with n-hexane: Enthalpy of hydrogen bonding

      S D Pradhan H B Mathur

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      Heats of mixing of normal, iso, secondary and tertiary butylamines withn-hexane have been determined at 25°C by means of a twin type calorimeter. All the four systems show an endothermic behaviour throughout the concentration range suggesting significant self association of the four isomeric butylamines. The enthalpy of the hydrogen bonding in butylamines have been found to be 8·4 kJ/mole, 7·5 kJ/mole, 6·6 kJ/mole and 4·9 kJ/mole for n-, iso-, sec- and tert-butylamines respectively. The above order of the energy of self-association has been attributed to steric hindrance to hydrogen bonding as a result of the branching of the alkyl chain.

    • Volume change on mixing of isomeric butanols with normal heptane

      Anil Kumar S D Pradhan S S Katti

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      Volume changes on mixing of isomeric butanols withn-heptane have been determined at 25°C and that of tertbutanol at 26°C. All the four systems show a positive excess volume throughout concentration range. The excess volumes have been found to vary in the order of tert >sec >iso >n-butanols. The order of the excess volume has been attributed to breaking of hydrogen bonds of associated species of alcohol by dilution withn-heptane and more random distribution ofn-heptane molecules.

    • Volume change on mixing: Binary mixtures of isomeric butylamines with chloroform

      Gopal Pathak K R Patil S D Pradhan

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      The excess volume of mixing for 1-aminobutane, 2-aminobutane, 1-amino-2-methylpropane and 2-amino-2-methylpropane with chloroform were determined at 30° by the density method. TheVE were negative for all the systems and showed the following order: 2-amino-2-methylpropane>2-aminobutane>1-amino-2-methylpropane>1-aminobutane. The negativeVE were attributed to complex formation between the amine and chloroform molecules owing to H bonding, while the particular trend was attributed to the decreasing degree of self-association of amine isomers.

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