Photo-induced Proton-Coupled Electron Transfer Reactions of Acridine Orange: Comprehensive Spectral and Kinetics Analysis
作者:Thomas T. Eisenhart、Jillian L. Dempsey
DOI:10.1021/ja505755k
日期:2014.9.3
The triplet excited state of acridine orange ((3)*AO) undergoes a proton-coupled electron transfer (PCET) reaction with tri-tert-butylphenol ((ttb)PhOH) in acetonitrile. Each of the reaction components possesses a spectroscopic signature, providing a rare opportunity to monitor the individual proton transfer, electron transfer, and H(•)-transfer components in parallel via transient absorption spectroscopy
吖啶橙 ((3)*AO) 的三重激发态在乙腈中与三叔丁基苯酚 ((ttb)PhOH) 发生质子耦合电子转移 (PCET) 反应。每个反应组分都具有光谱特征,这为通过瞬态吸收光谱并行监测单个质子转移、电子转移和 H(•)-转移组分提供了难得的机会。这种增强的光学跟踪以及激发态热化学分析有助于确定激发态 PCET 反应性的机制。(3)*AO 通过协同质子-电子转移 (CPET) 从 (ttb)PhOH 猝灭形成吖啶自由基 (AOH(•)) 和 (ttb)PhO(•) (kCPET = 3.7 × 10(8) M( -1) s(-1),KIE = 1.3)。随后,AOH(•) 还原苯氧基自由基 (kET = 5.5 × 10(9) M(-1) s(-1)),形成 AOH(+) 和 (ttb)PhO(-),