Abstract
Reaction of pentane-2,4-dione, pyridine-2-carboxylic acid or pyridine-2,6-dicarboxylic acid with trimethylplatinum(IV) gives dimeric complexes of general formulae fac-[PtMe 3L] 2, in which the ionised ligand acts in a chelating and a bridging fashion. High-resolution solid-state 19;Pt NMR data shows that the two platinum atoms are equivalent ; the chemical shielding anisotropy and the principal components of the shielding tensor are reported. The complexes are soluble in co-ordinating solvents, yielding monomeric species of general formulae fac-[PtMe 3L(solvent)], which are fluxional. The pyridine adducts, fac-[PtMe 3L(py)] (L = pentane-2,4-dionato or pyridine-2-carboxylato), are also stereochemically non-rigid. The energetics of the dynamic processes have been studied by standard 1H NMR band shape analysis techniques ; Δ G ‡ (298 K) is in the range 69–86 kJ mol −1. Solid-state 13C, and solution-state 13C and 19;Pt NMR data are also reported.
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