LIGAND EXCHANGE AND LIGAND TRADING INTRANS-[PtX2(OLEFIN) (PYRIDINE)] COMPLEXES

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Abstract
The 1H nmr spectra of freshly prepared CDCl3 solutions of the complexes trans-[PtCl2(olefin)(L)], where L is pyridine or a substituted pyridine, show no coupling between 1 9 5Pt and the α protons of pyridine (3Jpt–NCH) owing to rapid exchange of complexed L with free L. On standing, the adventitious free L is gradually consumed by formation of trans-[PtCl2(L)2] and the spectra of the aged solutions show the coupling. When CDCl, solutions of [PtBr2(Olb)(Lb)] and [PtCl2(Ola)(La)], where Ola =C2H4, are mixed, a total of 6 ethylene complexes can be identified in solution. Accordingly halogen trading, Ol trading or/and L trading occurs and the solution probably contains a total of 12 complexes.