Interaction of free functional group with platinum(II) center in cyclometalated complexes: A structural and photophysical property investigation
作者:Jun-Feng Zhang、Gan Xin、Wen-Fu Fu、Han Xu、Li Li
DOI:10.1016/j.ica.2009.10.021
日期:2010.1
A series of flexible multidentate ligands containing N,P-donor, 2-[N-(diphenylphosphino)methyl]amino-pyridine (L-1), 2-[N-bi-(diphenylphosphino)methyl]amino-pyridine (L-2), 2-[N-(diphenylphosphino)methyl]amino-7-methyl-1,8-naphthyridine (L-3) and 4-[(N-diphenylphosphino)methyl]amino-pyridine) (L-4) have been synthesized. The mono-and dinuclear cyclometalated platinum(II) complexes [Pt(C boolean AND N boolean AND N)L-1]ClO4 (HC boolean AND N boolean AND N = 6-phenyl-2,2'-bipyridine), [Pt-2(C boolean AND N boolean AND N)(2)L-1](ClO4)(2), [Pt-2(C boolean AND N boolean AND N)(2)L-2](ClO4)(2), [Pt(C boolean AND N boolean AND N)L-3]ClO4 and [Pt-2(C boolean AND N boolean AND N)(2)L-4](ClO4)(2) were prepared and their structures determined by X-ray crystal analysis. These complexes exhibit long-lived bright orange emissions ranging from 560 to 610 nm in the solid state at room temperature. In solution, dinuclear complexes have emissions with higher quantum yields than mononuclear complexes. This can be attributed to intramolecular interaction of free functional group with Pt(II) at axial position, resulting in the quenching of phosphorescence for platinum(II) complexes in the (MLCT)-M-3 excited state. (C) 2009 Elsevier B. V. All rights reserved.