Quantum-chemical calculations of the structure,vibrational spectra,and torsional and inversion potentials of methylcarbamate |
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Authors: | M B Shundalov G A Pitsevich M A Ksenofontov and D S Umreiko |
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Institution: | (1) Belarusian State University, 4 Nezavisimosti Ave., Minsk, 220030, Belarus;(2) A. N. Sevchenko Institute of Applied Physical Problems, Belarusian, State University, Minsk, Belarus |
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Abstract: | We present results of ab initio and DFT calculations of the structure, potential functions of the methyl group internal rotation and the amino group inversion,
and vibrational frequencies and intensities in IR and Raman spectra of methylcarbamate. The calculations were carried out
using different basis sets in the HF, MP2, and DFT/B3LYP approximations. The influence of both the basis set size and the
allowance for electronic correlation on peculiarities of the structure of the amino group in methylcarbamate has been analyzed.
It is shown that the B3LYP/6-311++G(2d, p) and B3LYP/cc-pVDZ calculations reproduce highly accurately experimental geometric
parameters of methylcarbamate. Parameters of torsional and inversion potentials and characteristics of vibrational spectra
calculated in different approximations show satisfactory agreement with experimental values.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 76, No. 3, pp. 349–357, May–June, 2009. |
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Keywords: | ab initio and DFT calculations torsion potential inversion potential IR and Raman spectra methylcarbamate |
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