Bodipy-Phenylethynyl Anthracene Dyad: Spin-Orbit Charge Transfer Intersystem Crossing and Triplet Excited-State Equilibrium
作者:Yanming Lei、Kepeng Chen、Geliang Tang、Jianzhang Zhao、Gagik G. Gurzadyan
DOI:10.1016/j.jphotochem.2020.112573
日期:2020.7
charge transfer-induced intersystem crossing (SOCT-ISC) is a promising method to design heavy atom-free triplet photosensitizers (PSs). Herein, a new organic triplet PS, BDP-An (Bodipy-phenylethynyl anthracene dyad) has been synthesized and studied. In polar solvents, charge transfer (CT) emission band was observed, and the singlet oxygen quantum yield (ΦΔ) is up to 95%. From femtosecond transient absorption
自旋轨道电荷转移诱导的系统间穿越(SOCT-ISC)是设计无重原子三重态光敏剂(PS)的一种有前途的方法。在此,已经合成并研究了一种新的有机三重态PS,BDP-An(Bodipy-苯基乙炔基蒽二联体)。在极性溶剂中,观察到电荷转移(CT)发射带,和单线态氧量子产率(Φ Δ)为至多95%。从飞秒瞬态吸收(fs TA)光谱中,验证了SOCT-ISC机理,电荷分离(CS)时间为1.6 ps,电荷重组(CR)的寿命为3.8 ns,而且苯基乙炔基蒽的三重态也为观测到的。在纳秒瞬态吸收(NS TA)光谱,长寿命三重态(τ Ť观察到= 108μs),它们在dyad的两个部分上都离域,即存在三重态激发态平衡。这是关于在显示SOCT-ISC的电子供体/受体二元组中观察到的三重态激发态平衡的首次报道。使用BDP-An作为三重态供体,使用per作为三重态受体,进行三重态-三重态an灭上转换(TTA UC),上转换量子产率高达18