• Thermodynamic study of binary mixtures of isomeric butylamines with methanol enthalpy of hydrogen bonded complex

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      https://www.ias.ac.in/article/fulltext/jcsc/088/05/0337-0350

    • Keywords

       

      Heats of mixing; butylamine-methanol; thermodynamics; binary systems; enthalpy of complexes

    • Abstract

       

      Heats of mixing of the binary mixtures ofn-, sec-, iso- andt-butylamines with methanol were determined in the entire concentration range. All the four systems showed a strong exothermic behaviour. The exothermic heats of mixing vary in the ordert-BuNH2 >n-BuNH2 > sec-BuNH2 > iso-BuNH2. The enthalpy of hydrogen bond in the methanol-butylamine complexes was calculated by means of a thermochemical cycle and found to vary in the ordert-BuNH2 >n-BuNH2 > iso-BuNH2 > sec-BuNH2. This order is different than that found for the hydrogen bond due to self-association. The difference has been explained in the light of steric and electromeric effects arising out of the substitution of the methyl groups in the alkyl chain of the butylamine.

    • Author Affiliations

       

      S D Pradhan1 H B Mathur1 2

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

       
  • Journal of Chemical Sciences | News

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