In II, rearrangement through a trigonalbipyramidal structure equilibrates the ethyl groups. A weakly associated solvent molecule could be liberated in this process to account for the positive 5*The ability of phosphine to catalyze phosphine exchange and the observation of what may be six-coordinate species precipitating from solution when excess Ph2PCH3 is added to la and lb further support the hypothesis that the low-energy configuration in these complexes is a solvated PtS4L square pyramid.

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