Photophysics of Ru(II) complexes with hydroxylated diimine ligands: Photoinduced electron/proton transfer to anthraquinone
作者:Kristina Martinez、Kaitlyn Benson、Jared Paul、Russell H. Schmehl
DOI:10.1016/j.poly.2021.115376
日期:2021.10
between the photoexcited complexes and AQ. For the OMebpy complex, only excited state electron transfer (ET*) from the 3MLCT state of the complex to AQ was possible. However, for the OHbpy complex, the excited state could react with AQ via a variety of pathways including excited state electron transfer, ET*, excited state proton transfer (PT*) and excited state proton coupled electron transfer (PCET*)
这份手稿报告了两种发光发色团的3 种MLCT 激发态的反应,[(bpy) 2 Ru(OHbpy)] 2+和 [(bpy) 2 Ru(OMebpy)] 2+ (bpy = 2,2'-联吡啶, OHbpy = 4-羟基-2,2'-联吡啶,OMebpy = 4-甲氧基-2,2'-联吡啶),与蒽醌 (AQ)。进行了一系列发光、电化学、分光光度和瞬态吸收研究,以确定光激发配合物和 AQ 之间潜在反应路径的自由能。对于 OMebpy 复合物,只有来自3AQ 复合物的 MLCT 状态是可能的。然而,对于 OHbpy 复合物,激发态可以通过多种途径与 AQ 反应,包括激发态电子转移、ET*、激发态质子转移 (PT*) 和激发态质子耦合电子转移 (PCET*)。热力学分析表明,对于 OHbpy 复合物,PT* 是非常吸能的,不是可行的反应途径,但是 ET* 和 PCET* 都可能发生。发光猝灭研究表明,OHbpy