The Excited-State Triple Proton Transfer Reaction of 2,6-Diazaindoles and 2,6-Diazatryptophan in Aqueous Solution
作者:Kun-You Chung、Yi-Han Chen、Yi-Ting Chen、Yen-Hao Hsu、Jiun-Yi Shen、Chi-Lin Chen、Yi-An Chen、Pi-Tai Chou
DOI:10.1021/jacs.7b01672
日期:2017.5.10
× 108 s-1 and 4.7 × 108 s-1 in H2O and D2O, respectively. Proton inventory experiments indicate the involvement of two water molecules and three protons, which undergo a relay type of excited-state triple proton transfer (ESTPT) in a concerted, asynchronous manner. The results demonstrate for the first time the fundamental of triple proton transfer in pure water for azaindoles as well as pave a new
3-Me-2,6-二氮杂吲哚 ((2,6-aza)Ind) 被战略性地设计和合成以探测水溶液中水分子催化的激发态质子转移。在电子激发下 (λmax ∼ 300 nm),(2,6-aza)Ind 在中性 H2O 中经历 N(1)-H 到 N(6) 的长距离质子转移,导致正常的 (340 nm) 和质子转移互变异构体 (480 nm) 发射,总量子产率为 0.25。水催化质子转移的速率显示出显着的 H/D 动力学同位素效应,在 H2O 和 D2O 中分别确定为 8.3 × 108 s-1 和 4.7 × 108 s-1。质子库存实验表明两个水分子和三个质子的参与,它们以协调、异步的方式经历中继型激发态三重质子转移 (ESTPT)。