W. Lu, M. C. Chan, K. Cheung
May 11, 2001
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Organometallics
Abstract
A series of mono- and multinuclear dicyclometalated platinum(II) complexes, namely, [Pt(C∧N∧C)L1] [HC∧N∧CH = 2,6-diphenylpyridine; L1 = 4-tert-butylpyridine (1), 1-methyl-4,4‘-bipyridinium (MQ+) hexafluorophosphate (2(PF6)), 2,6-dimethylphenylisocyanide (4), tricyclohexylphosphine (5), triphenylphosphine (7)], [Pt2(C∧N∧C)2(μ-L2)] [L2 = pyrazine (pyr; 3), bis(dicyclohexylphosphino)methane (dcpm; 6), bis(diphenylphosphino)methane (dppm; 8)], and [Pt3(C∧N∧C)3(μ3-dpmp)] [dpmp = bis(diphenylphosphinomethyl)phenylphosphine (9)], were synthesized from [Pt(C∧N∧C)dmso] (dmso = dimethyl sulfoxide). The X-ray crystal structures of 1, 3·CHCl3, 4, 6·CHCl3·CH3OH·4H2O, 7, 8 (yellow form), and 8·CHCl3 (orange form) have been determined. For complex 1, the Pt(C∧N∧C) units are oriented into pairs in a head-to-tail fashion with an interplanar separation of 3.40 A. For complex 4, dimeric π−π overlap between Pt(C∧N∧C) and phenyl moieties in a head-to-tail manner is observed, with interplanar stacking at 3.39 A. There are two ...