A Time-Resolved Spectroscopic Study of the Bichromophoric Phototrigger 3′,5′-Dimethoxybenzoin Diethyl Phosphate: Interaction Between the Two Chromophores Determines the Reaction Pathway
作者:Chensheng Ma、Wai Ming Kwok、Hui-Ying An、Xiangguo Guan、Michael Yunyi Fu、Patrick H. Toy、David Lee Phillips
DOI:10.1002/chem.200902891
日期:——
5′‐dimethoxybenzofuran (DMBF). The underlying mechanism of the DMB deprotection and cyclization has, however, until now remained unclear. Femtosecond transient absorption (fs‐TA) spectroscopy and nanosecond time‐resolved resonance Raman (ns‐TR3) spectroscopy were employed to detect the transient species directly, and examine the dynamic transformations involved in the primary photoreactions for DMB diethyl phosphate
3',5'-二甲氧基安息香(DMB)是一种双发色体系,已广泛用作释放各种官能团的高效光可移除保护基(PRPG)。DMB光触发的光脱保护非常干净,并伴随着生物良性环化产物3',5'-二甲氧基苯并呋喃(DMBF)的形成。但是,直到现在,DMB脱保护和环化的基本机制仍不清楚。飞秒瞬态吸收(fs‐TA)光谱和纳秒时间分辨共振拉曼(ns‐TR 3)光谱可直接检测瞬态物质,并检查DMB磷酸二乙酯(DMBDP)初级光反应中涉及的动态转变。乙腈(CH 3CN)。为了评估电子特性,并通过各个子类生色团发挥的作用,也就是苯甲酰和二元为了使DMBDP脱保护,在相同溶剂中还对参考化合物磷酸二乙酯苯乙酮(DPAP)和3',5'-二甲氧基苄基二乙基磷酸酯(DMBnDP)进行了fs-TA对比-甲氧基苄基部分。fs-TA光谱的比较表明,光激发的DMBDP与参考化合物相比具有明显不同的光谱特性和动态演化。这一事实与相关的稳