Bimolecular Excited-State Proton-Coupled Electron Transfer within Encounter Complexes
作者:Kristina Martinez、Sydney M. Koehne、Kaitlyn Benson、Jared J. Paul、Russell H. Schmehl
DOI:10.1021/jacs.2c10165
日期:2023.3.1
excited state electron transfer (ET*) and the excited state proton transfer (PT*) products by the difference in the visible absorption spectrum of the species emerging from the encounter complex. The observed behavior differs from that of reaction of the MLCT state of [(bpy)2Ru(4,4′-dhbpy)]2+ (bpy = 2,2′-bipyridine) with MQ+, where initial ET* is followed by diffusion-limited proton transfer from the coordinated
[(dpab) 2 Ru(4,4'-dhbpy)] 2+ (dpab = 4,4'-di( n -propyl)amido-2,2'-bipyridine, 4,4'-dhbpy = 4,4'-dihydroxy-2,2'-bipyridine) with N -methyl-4,4'-bipyridinium (MQ + ) 和N -benzyl-4,4'-bipyridinium (BMQ + ) 在无水乙腈溶液中。PCET* 反应产物、氧化和去质子化的 Ru 络合物以及还原的质子化 MQ +可以通过从遇到复合物中出现的物种的可见吸收光谱的差异来区分激发态电子转移 (ET*) 和激发态质子转移 (PT*) 产品。观察到的行为不同于 [(bpy) 2 Ru(4,4'-dhbpy)] 2+ (bpy = 2,2'-联吡啶) 的 MLCT 状态与 MQ +的反应,其中遵循初始 ET*通过从协调的