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The inelastic neutron scattering spectra of π-C5H5Rh(C2H4)2, π-C5H5Rh(C2H4)SO2 and [Rh-(C2H4)2Cl]2 have been measured and the torsional vibrations of their ethylene groups have been assigned. In the diethylene compounds in-phase and out-of-phase torsions have been observed and for [Rh(C2H4)2Cl]2 their frequencies are 112 ± 5 and 226 ± 5 cm–1. A model has been proposed for the interaction between the ethylene groups and the experimentally observed frequencies have been expressed in terms of constants derived from this model.
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Howard et al. (1976) studied this question.
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