A. Ionkin, W. Marshall, Ying Wang
Jan 14, 2005
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Organometallics
Abstract
A series of mono-cyclometalated Pt(II) complexes (9, 10, 13, 15, and 17) bearing 2-(3,5-bis(trifluoromethyl)phenyl)-4-methylpyridine (1) as the same chromophoric N∧C cyclometalated ligand and the second nonchromophoric bidenate ligands with increasing bulkiness were synthesized by the following steps. The palladium-catalyzed cross-coupling reaction between 2-chloro-4-methylpyridine (2) and 3,5-bis(trifluoromethyl)phenylboronic acid (3) was used to prepare 2-(3,5-bis(trifluoromethyl)phenyl)-4-methylpyridine (1). Di-tert-butyl(trimethylsilyl)anylmethylphosphine, tert-Bu2P-CH2-SiMe3 (5), was used as a ligand for the Suzuki coupling. The cyclometalation of 1 by K2PtCl4 (7) was carried out in (MeO)3PO (8) with the formation of a chloro-bridged dimer N∧CPt(μ-Cl)2PtC∧N (9). The reactions of 9 with 2,2,6,6-tetramethylheptane-3,5-dionate (11), 1,1,1,3,3,3-hexafluoro-2-pyrazol-1-ylmethylpropan-2-ol (12), 2-[(diphenylphosphanyl)methyl]-1,1,1,3,3,3-hexafluoropropan-2-ol (14), and 2-[(di-tert-butylphosphanyl)methyl]-1...