Thermodynamics of molecular interactions in binary mixtures containing nitromethane: Molar excess volumes and molar excess enthalpies

Abstract

<span style="font-size:12.0pt;font-family: " times="" new="" roman";mso-fareast-font-family:"times="" roman";mso-ansi-language:="" en-in;mso-fareast-language:en-in;mso-bidi-language:ar-sa"="" lang="EN-IN">Molar excess volumes, <i>V^E </i>and molar excess enthalpies, <i>H^E, </i>for nitromethane(i) isopropanol or +<i style="mso-bidi-font-style:normal">n</i>-butanol(j) binary mixtures have been measured by dilatometer and microflow calorimeter as a function of composition at 308.15K. The <i>V^E </i>data have been analysed in terms of graph-theoretical approach to extract information about the state of isopropanol or <i style="mso-bidi-font-style:normal">n</i>-butanol in pure and mixture states. It has been observed that isopropanol and <i style="mso-bidi-font-style: normal">n</i>-butanol exist as dimer in the pure state and the (i+j) mixtures are characterised by interactions between oxygen and nitrogen atoms of nitromethane (i) with hydrogen and oxygen atoms of alcoholic group of alcohols to form 1:1 molecular complex. The energetics of the mixtures have also been discussed.</span>