Structural studies of complexes containing cycloplatinated tris(pyrazol-1-yl)methane

A.J. Canty, R.T. Honeyman, Brian Skelton, Allan White

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Abstract

Cyclometallation at the C(5) position of one ring of tris(pyrazol-1-yl)methane occurs on dissolution of PtMe2{(pz)3CH} in 3,5-dimethylpyridine, to form the platinum(II) complex PtMe{(pz)2(C3H2N2)-CH-N,C}(3,5-Me2py) (1b). Structural studies of 1b, and the related complexes PtMe{(pz)2(C3H2N2)-CH-N,C}(N-methylimidazole) (1c) and PtMe{(pz)2(C3H2N2)CH-N,C}{PPh2(o-MeOC6H4)} (1d) show that these complexes have square planar geometry with cis-organic groups, with the cyclometallated group having one pyrazole ring uncoordinated. The complexes PtMe{(pz)2(C3H2N2)CH-C}(L2) [L2 = 2PPh3 (2a), 2PEtPh2 (2b), Ph2PCH2CH2PPh2 (2c)] have a similar geometry at platinum(II); the metallated ligand is present as a [C]- donor with two uncoordinated pyrazole rings. In 2a, 2b, and 2c, there are short Pt...H contacts at approximately 2.7 angstrom for the methine proton of the cyclometallated ligand.
Original languageEnglish
Pages (from-to)245-257
JournalJournal of Organometallic Chemistry
Volume430
DOIs
Publication statusPublished - 1992

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