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Raman study of the rotational isomers of bicyclopropyl and vinylcyclopropane
Author(s) -
Salares V. R.,
Murphy W. F.,
Bernstein H. J.
Publication year - 1978
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250070308
Subject(s) - conformational isomerism , raman spectroscopy , enthalpy , chemistry , cis–trans isomerism , spectral line , vapor pressure , analytical chemistry (journal) , thermodynamics , stereochemistry , organic chemistry , molecule , physics , astronomy , optics
The Raman spectra of bicyclopropyl and vinylcyclopropane were studied in the solid, liquid and vapor phases in an attempt to identify their rotational isomers and to measure their enthalpy differences. For bicyclopropyl, the presence of the s‐trans and gauche isomers in the liquid and vapor phases has been confirmed. The present measurements show that the gauche isomer is more stable in both the vapor and liquid, by 91±28 cal mol −1 in the vapor and by 188±10 cal mol −1 in the liquid. For vinylcyclopropane, features due to only two conformers could be identified in the liquid and vapor spectra. In the vapor the predominant isomer, previously identified as the s‐trans rotamer, 9 was found to be more stable by 1.1±0.1 kcal mol −1 .