期刊
JOURNAL OF MOLECULAR STRUCTURE
卷 521, 期 -, 页码 49-75出版社
ELSEVIER
DOI: 10.1016/S0022-2860(99)00425-1
关键词
ab initio calculations; double-bond torsion; molecular mechanics; normal modes; olefinic molecules
A spectroscopically determined force field (SDFF) has been obtained for hydrocarbon chains with olefinic unsaturation. The parametrization of this potential energy function was based on the SDFF transformation of ab initio structures and experimentally scaled force constants, which were optimized to assigned vibrational frequencies of ethene, propene, skew- and syn-1-butene, trans- and cis-2-butene, and isobutene. The Bell torsion coordinate was used to describe torsion about the C=C bond. In addition to good agreement with ab initio structures and energies, this SDFF gives an average rms error for non-CH stretch frequencies of the above molecules of 9.3 cm(-1), with substantially correct reproduction of ab initio eigenvectors. (C) 2000 Elsevier Science B.V. All rights reserved.
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