The terahertz spectrum and quantum chemical assignment of 2,2′-bithiophene in cyclohexane

Anna M. Fedor, Damian G. Allis, Timothy M. Korter

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

The room temperature solution-phase terahertz (THz, 7 to 165 cm-1) spectrum of 2,2′-bithiophene in cyclohexane is reported. Density functional theory (B3LYP) and ab initio (MP2) methods employing the 6-311++G(2d,2p) and aug-cc-pVDZ basis sets are used to assign the THz vibrational structure and determine the relative populations of the cis and trans conformations, as well as the trans-trans rotational barrier height and the effects of the cyclohexane solvent on the predicted molecular geometries and vibrational frequencies. Significant differences are seen in the performance of the different theoretical methods, with the best performing method dependent upon the molecular property of interest. The best fit model of the experimental THz spectrum is achieved using MP2/aug-cc-pVDZ, which places the relative trans and cis populations at 54% and 46%, respectively.

Original languageEnglish (US)
Pages (from-to)124-132
Number of pages9
JournalVibrational Spectroscopy
Volume49
Issue number2
DOIs
StatePublished - Mar 18 2009

Keywords

  • Bithiophene
  • Density functional theory
  • Far-infrared
  • Terahertz spectroscopy
  • Torsional potential

ASJC Scopus subject areas

  • Spectroscopy

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