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Trimethylplatinum(IV) complexes of anionic N/O and O/O donor ligands: synthesis, NMR and fluxional behaviour

Heard, Peter J, Kite, Kenneth and Aliev, Abil E (1998) Trimethylplatinum(IV) complexes of anionic N/O and O/O donor ligands: synthesis, NMR and fluxional behaviour.

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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.

Item Type: Article
Additional Information: Copyright © 1998 Elsevier Science Ltd. All rights reservedThis is the author's final version of the article which was originally published in the Polyhedron Journal in 1998 by Elsevier. The full article can be found at http://dx.doi.org/10.1016/S0277-5387(98)00007-2
Keywords: trimethylplatinum(IV), NMR, fluxionality
Divisions: ?? GlyndwrUniversity ??
Depositing User: ULCC Admin
Date Deposited: 05 Oct 2011 09:13
Last Modified: 11 Dec 2017 20:05
URI: http://glyndwr.collections.crest.ac.uk/id/eprint/147

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