The trans/gauche conformational equilibrium and associated thermodynamic parameters of liquid 1,2-dibromoethane as studied by infrared electroabsorption spectroscopy

I-Chun Lee, Hiro O. Hamaguchi, Shinsuke Shigeto

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Abstract

Infrared electroabsorption spectroscopy is used to study the trans/gauche conformational equilibrium and associated thermodynamic parameters of the two conformers of liquid 1,2-dibromoethane at room temperature. Electric-field modulation induces an increase in the population of the gauche conformer that has the permanent dipole moment and a decrease in that of the trans conformer that has a center of inversion symmetry and hence no dipole moment. The Gibbs free energy difference DG and the entropy difference Delta S between the gauche and trans conformers are obtained as 4.5 kJ mol(-1) and -2.7 J K(-1) mol(-1), respectively, using the reported enthalpy difference. (C) 2008 Elsevier B. V. All rights reserved.
Original languageEnglish
Pages (from-to)144-147
Number of pages4
JournalChemical Physics Letters
DOIs
StatePublished - 4 Dec 2008

Keywords

  • ROTATIONAL-ISOMERISM; BAND INTENSITIES; 1,2-DICHLOROETHANE

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