Abstract
The availability of new infrared and Raman data for metal-ethene complexes, has prompted a new normal coordinate analysis of the M(C 2H 4) fragment, using a larger data set than in previous studies. Assuming local C 2ν symmetry, M(C 2H 4) is treated in identical fashion to ethene oxide, C 2H 4O. Thus, a set of generalised valence force field (GVFF) force constants is obtained by fitting all of the a 1 and b 1 wavenumbers of C 2H 4O, C 2D 4O, C 2H 4Pt II, C 2D 4Pt II, C 2H 4Fe (o), C 2D 4Fe (o) and C 2H 4Pt (o). The trends in CC and MC stretching force constants indicate an increasing tendency towards a metallocyclopropane form, in the order: C 2H 4Pt II < C 2H 4Fe (o) ≲ C 2H 4Pt (o) < C 2H 4O. These, and other force constants, suggest that Zeise's salt is exceptional in not adopting a metallocyclopropane structure.
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