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

      S D Pradhan H B Mathur

      Physical and Theoretical Volume 87 Issue 1 January 1978 pp 23-29

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/087/01/0023-0029

    • Keywords

       

      Heats of mixing; hydrogen bonding; thermodynamics; binary systems; butylamines-hexane

    • Abstract

       

      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.

    • Author Affiliations

       

      S D Pradhan1 H B Mathur1 2

      1. National Chemical Laboratory, Poona - 411 008
      2. Defence Materials and Stores Research and Development Establishment, Kanpur - 208 013

    • Dates

       
      Published
      January 1978
      Manuscript received
      22 October 1977

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