Organometallic complexes, like Os2(CO)8C2H4, Fe(CO)4C2H4 and [PtCl3C2H4]K, were considered as selected examples of ethylene coordination to metal centres and were examined together with molecules, such as BrC2H4Br, CH3C2H4CH3, ethylene oxide etc., taken as vibrational models for the C2H4 unit. The IR frequencies and intensities of the main C2H4 vibrational modes were compared and related to other chemical-physical parameters, like the C—C bond distance and the electronic charge distribution on the H atoms, which were estimated on the basis of the relative intensities of the bands belonging to the CH2 stretching and deformation modes. The intensity data proved to be a very sensitive marker for the σ and π contributions to the M-C2H4 interaction and could be a useful guide to study ethylene chemisorbed on metal surfaces.
Infrared intensities and frequencies of the vibrational modes of the C2H4 unit in organometallic systems
DIANA, Eliano;
1991-01-01
Abstract
Organometallic complexes, like Os2(CO)8C2H4, Fe(CO)4C2H4 and [PtCl3C2H4]K, were considered as selected examples of ethylene coordination to metal centres and were examined together with molecules, such as BrC2H4Br, CH3C2H4CH3, ethylene oxide etc., taken as vibrational models for the C2H4 unit. The IR frequencies and intensities of the main C2H4 vibrational modes were compared and related to other chemical-physical parameters, like the C—C bond distance and the electronic charge distribution on the H atoms, which were estimated on the basis of the relative intensities of the bands belonging to the CH2 stretching and deformation modes. The intensity data proved to be a very sensitive marker for the σ and π contributions to the M-C2H4 interaction and could be a useful guide to study ethylene chemisorbed on metal surfaces.
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