Correlation between solvent-induced vibrational frequency shifts of the CO moiety and solvent electron acceptor numbers: tetramethylurea

Margaret M. Wohar, Jasmeet K. Seehra, Paul W. Jagodzinski

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

The CO stretching frequencies in the Raman spectra of 0.10 M solutions of tetramethylurea in seventeen solvents have been recorded. These frequencies exhibit a linear relationship with the solvent electron acceptor number. Comparison of the slopes of these lines and those obtained from analyzing literature data of ν(CO) reveals a correlation with the bond polarity. A linear correlation between (νhexanesoln)/νhexane and the solvent acceptor number is also shown. The slopes of these latter plots can be related to νhexane and it is suggested that this approach be used to explain the specific solvent-solute interaction contributions to solvent-induced vibrational frequency shifts. This method is compared with the solvato-chromic method and it is shown that solvent acidity strongly influences the observed vibrational frequency shifts for the CO moiety of tetramethylurea.

Original languageEnglish (US)
Pages (from-to)999-1006
Number of pages8
JournalSpectrochimica Acta - Part A Molecular Spectroscopy
Volume44
Issue number10
DOIs
StatePublished - 1988
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)

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