Infrared studies on the complexes cis-[Rh(CO) 2(NH 3)(X)] (XCl, Br): isotopic labelling studies and normal coordinate analysis

The infrared spectra (4000-50 cm −1) of the complexes cis-[Rh(CO) 2(NH 3)(X)] (XCl, Br) and their 15NH 3, ND 3 and 13CO isotopomers have been determined. Empirical assignments of the infrared-active modes are based on the frequency shifts caused by selective isotopic substitution experiments. The e...

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Bibliographic Details
Published in:Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 1997-07, Vol.53 (7), p.1005-1015
Main Authors: Hall, Philip S., Verhoeven, Paul F.M.
Format: Article
Language:English
Subjects:
Infrared spectrometry
Isotopic substitution
Normal coordinate analysis
Rhodium carbonyl complexes
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Summary:The infrared spectra (4000-50 cm −1) of the complexes cis-[Rh(CO) 2(NH 3)(X)] (XCl, Br) and their 15NH 3, ND 3 and 13CO isotopomers have been determined. Empirical assignments of the infrared-active modes are based on the frequency shifts caused by selective isotopic substitution experiments. The empirical assignments have been verified by a normal coordinate analysis of the in-plane vibrational modes. The potential energy distribution reveals very little coupling between the normal vibrational modes. However, there exists some coupling between ν(RhX) and ν(RhC) in the choro complex.
ISSN:1386-1425
DOI:10.1016/S1386-1425(96)01859-8