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1H NMR spectra and characterization of some trimethylplatinum(IV) compounds:Evidence for cis and trans influences

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
38
Issue
2
Identifiers
DOI: 10.1016/s0022-328x(00)83343-4

Abstract

Abstract 1H NMR spectra of complexes of the types Pt(CH 3) 3L 2X (L 2 = 2,2′-bipyridine, bis(pyridine), or bis(3,5-lutidine), and X = uninegative unidentate ligand); [Pt(CH 3) 3BipyX]ClO 4 (X = neutral unidentate ligand), and Pt(CH 3) 3LI (L = substituted 2,2′-pipyridine or 1,10-phenanthroline) have been recorded. The magnitude of J( 195PtCH) for the methyl group trans to X has been found to be markedly dependent on X, with values ranging from 40.5 to 82.0 Hz. Much smaller variations occur in J( 195PtCH) for the methyl groups trans to the heterocyclic ligands as X is varied (< 6 Hz), or for the methyl trans to I as the heterocyclic ligand is varied (< 5 Hz). The order of trans influence for a series of ligands X has been found to be CH 3 > CN > PPh 3 > NO 2 > amines ∼ Py ∼ SCN > NCO ∼ NCS ∼ I > Br ∼ Cl >/ CH 3COO > NO 3 > H 2O. Infrared data for the vibrations of X, where X = polyatomic uninegative ligand, and for the methyl vibrations have also been recorded.

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