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.
Chemistry | Inorganic Chemistry | Organic Chemistry | Physical Chemistry
Heard, P. J., Kite, K., and Alliev, A. E. (1998) “Trimethylplatinum(IV) complexes of anionic N/O and O/O donor ligands: synthesis, NMR and fluxional behaviour”. Polyhedron, 17(15), 2543-2554
Digital Commons Citation
Heard, Peter J.; Kite, Kenneth; and Aliev, Abil E., "Trimethylplatinum(IV) complexes of anionic N/O and O/O donor ligands: synthesis, NMR and fluxional behaviour" (1998). Chemistry. Paper 9.