Photophysics and Nonlinear Absorption of Cyclometalated 4,6-Diphenyl-2,2′-bipyridyl Platinum(II) Complexes with Different Acetylide Ligands
作者:Rui Liu、Yunjing Li、Yuhao Li、Hongjun Zhu、Wenfang Sun
DOI:10.1021/jp107348h
日期:2010.12.9
The photophysical properties of a series of 4,6-diphenyl-2,2′-bipyridyl platinum(II) complexes bearing different σ-alkynyl ancillary ligands (1a−1k) were systematically investigated. All complexes exhibit strong 1π,π* absorption bands in the UV region; and broad, structureless charge-transfer band(s) in the visible region, which systematically red-shift(s) when the electron-donating ability of the
系统地研究了一系列带有不同σ-炔基辅助配体(1a - 1k)的4,6-二苯基-2,2'-联吡啶基铂(II)配合物的光物理性质。所有配合物表现出强1个π,π*在UV区吸收带; 可见区中宽阔的无结构电荷转移带,当对位取代基在苯乙炔配体上的供电子能力增加时,该转移带系统地发生红移。在室温下,所有络合物在溶液中都是发光的。当在电荷转移吸收带处激发时,络合物显示长寿命的橙色发射(λmax:555-601 nm),这归因于三重态金属到配体的电荷转移/配体内的电荷转移发射(3 MLCT / 3 ILCT)。这些络合物中的大多数在近红外区可见光中均表现出广泛的三重态瞬态差异吸收,其寿命可与通过3 MLCT / 3 ILCT发射的衰减测得的寿命相比。使用纳秒激光脉冲在532 nm处证明了这些络合物的反向饱和吸收(RSA)。RSA的程度如下这种趋势:1K ≈ 1A > 1C > 1F ≈ 1I > 1H ≈ 1B