Journal
CHEMICAL PHYSICS LETTERS
Volume 331, Issue 5-6, Pages 502-508Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0009-2614(00)01210-0
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This Letter introduces a systematic development of a quantitative vibrational force field (FF) capable of modeling vibrational spectra of cobalt corrinoids (B-12 derivatives). The scaled quantum mechanical (SQM) method is used to refine density functional theory (DFT) based force constants calculated at the B3LYP level of theory. The reliability of the DFT-SQM FF for cobalt corrinoids is tested on a six-coordinate methylcobalamin Im-[Co-III-corrin]-CH3 model. It is shown that the computed frequencies and Raman intensities permit detailed vibrational assignment. This analysis illustrates the utility of DFT-SQM FF in making detailed connections between the structure of cobalt corrinoids and their vibrational spectra, (C) 2000 Elsevier Science B.V. All rights reserved.
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