Journal
VIBRATIONAL SPECTROSCOPY
Volume 49, Issue 2, Pages 124-132Publisher
ELSEVIER
DOI: 10.1016/j.vibspec.2008.06.001
Keywords
Terahertz spectroscopy; Far-infrared; Bithiophene; Torsional potential; Density functional theory
Categories
Funding
- National Science Foundation [PHY0442188]
- ACS-Petroleum Research Fund [PRF-40610-G6]
- Photonics Technology Access Program
- Intelligence Community Postdoctoral Research Fellowship Program
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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 6311++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. (C) 2008 Elsevier B.V. All rights reserved.
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