Trimethylplatinum(iv) halide complexes of pyrazolylbipyridyl ligands. crystal structure of [PtIMe3{6-(3,5-DIMETHYLPYRAZOL-1-YL)-2,2′-BIPYRIDINE}]

Trimethylplatinum(IV) halide tetramers [(PtXMe3)4] reacted with pyrazolylbipyridyl ligands to afford stable octahedral complexes of type fac-[PtXMe3L] [L = (6-pyrazol-l-yl)-2,2′-bipyridine (pbipy), X = Cl, I; L = 6-(4-methylpyrazol-1-yl)-2,2′-bipyridine (mpbipy) or 6-(3,5-dimethylpyrazol-1-yl)-2,2′-...

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Published in:Polyhedron 1996-06, Vol.15 (19), p.3203-3210
Main Authors: Gelling, Andrew, G. Orrell, Keith, G. Osborne, Anthony, Šik, Vladimir, B. Hursthouse, Michael, J. Coles, Simon
Format: Article
Language:English
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Summary:Trimethylplatinum(IV) halide tetramers [(PtXMe3)4] reacted with pyrazolylbipyridyl ligands to afford stable octahedral complexes of type fac-[PtXMe3L] [L = (6-pyrazol-l-yl)-2,2′-bipyridine (pbipy), X = Cl, I; L = 6-(4-methylpyrazol-1-yl)-2,2′-bipyridine (mpbipy) or 6-(3,5-dimethylpyrazol-1-yl)-2,2′-bipyridine (dmpbipy), X = I]. Both bipyridyl and pyridyl/pyrazolyl coordinated complexes of pbipy and mpbipy are formed in solution with the ‘bipyridyl’ coordinated species greatly predominating (>95%). A fluxional exchange between the two coordination species was detected by 1H NMR. The crystal structure of [PtIMe3(dmpbipy)] showed exclusive ‘bipyridyl’ coordination to PtIV with the pendant pyrazolyl ring rotated by 74.34 and 77.39° from the plane of the neighbouring pyridyl ring in the two crystallographically independent molecules. Copyright © 1996 Elsevier Science Ltd
ISSN:0277-5387
DOI:10.1016/0277-5387(96)00063-0