Structural Volume Changes upon Photoisomerization: A Laser-Induced Optoacoustic Study with a Water-Soluble Nitrostilbene
作者:Ingolf Michler、Alessandro Feis、Miguel A. Rodríguez、Silvia E. Braslavsky
DOI:10.1021/jp004334m
日期:2001.5.1
The trans to cis photoisomerization of 4,4‘-dinitro-2,2‘-disulfonylstilbene (DS) was studied by laser-induced optoacoustic spectroscopy (LIOAS) in aereated neat water and in aereated aqueous solutions of various monovalent cations (NH4+, N(CH3)4+, Na+, K+, and Cs+) and the respective cis to trans photoisomerization only in the presence of NH4+. In every case, two single-exponential components were
4,4'-二硝基-2,2'-二磺酰基芪 (DS) 的反式到顺式光异构化通过激光诱导光声光谱 (LIOAS) 在充气纯水中和充气各种单价阳离子 (NH4+, N (CH3)4+、Na+、K+ 和 Cs+) 以及各自的顺式到反式光异构化仅在 NH4+ 存在下。在每种情况下,都需要两个单指数分量来拟合数据,一个具有未解决的寿命(<20 ns),用于出现三重态混合物 T(垂直三重态 3p* 与最低反式三重态平衡3t *)和一个在 5.5 °C 下具有较长寿命的(75 ± 20)ns 用于 T 混合物的衰减。LIOAS 振幅的温度依赖性与确定的异构化量子产率相结合,提供了 -(1.4 ± 0.0) 的收缩。15) 反式到 T 转变的 ml/mol,而对于顺式到 T 转变,获得了较小的 -(0.15 ± 0.15) ml/mol 收缩。公司的不同价值观...