Trimethylplatinum (IV) complexes of anionic OO and NO donor ligands : synthesis, NMR and fluxional behaviour

Author(s): Peter J. Heard | Kenneth Kite | Abil Aliev.

Type of publication: Journal paper

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-[PtMe3L]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-[PtMe3L(solvent)], which are fluxional. The pyridine adducts, fac-[PtMe3L(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 ; ΔG ‡ (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.

Publication title: Polyhedron

Publisher: Elsevier

Place of publication: London United Kingdom

Pages: 2543-2554

Subject(s): Chemistry

DOI: https://doi.org/10.1016/S0277-5387(98)00007-2

Keywords: trimethylplatinum(IV)NMRfluxionality

Depositing User: Luke Miller