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

Authors
Journal
Journal of Organometallic Chemistry
0022-328X
Publisher
Elsevier
Publication Date
Volume
430
Issue
2
Identifiers
DOI: 10.1016/0022-328x(92)86011-r
Disciplines
  • Mathematics

Abstract

Abstract Cyclometallation at the C(5) position of one ring of tris(pyrazol-1-yl)methane occurs on dissolution of PtMe 2{(pz) 3CH} in 3,5-dimethylpyridine, to form the platinum(II) complex PtMe{(pz) 2(C 3H 2N 2)-CH- N, C}(3,5-Me 2py) ( 1b). Structural studies of 1b, and the related complexes PtMe{(pz) 2(C 3H 2N 2)-CH- NC}( N-methylimidazole) ( 1c) and PtMe{(pz) 2(C 3H 2N 2CH- N, C}{PPh 2( o-MeOC 6H 4)} ( 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(C 3H 2N 2)CH- C}(L 2) [L 2 = 2PPh 3 ( 2a), 2PEtPh 2 ( 2b), Ph 2PCH 2CH 2PPh 2 ( 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 ~ 2.7 Å for the methine proton of the cyclometallated ligand.

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