The Effect of Methylation on the Triplet-State Dynamics of 2-Thiouracil: Time-Resolved Photoelectron Spectroscopy of 2-Thiothymine
The Effect of Methylation on the Triplet-State Dynamics of 2-Thiouracil: Time-Resolved Photoelectron Spectroscopy of 2-Thiothymine
复制标题
甲基化对 2-硫尿嘧啶三重态动力学的影响：2-硫胸腺嘧啶的时间分辨光电子能谱
DOI：
10.1021/acs.jpca.2c06051
复制
发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Shrestha, Sarita
中科院分区：
文献类型：
--
作者：
Ullrich, Susanne;Qu, Yingqi;Mohamadzade, Abed;Shrestha, Sarita
利用时间分辨光电子能谱研究了2-硫脲嘧啶（2TU）和2-硫胸腺嘧啶（2TT）的超快内部转化和系统间交叉动力学，探讨了甲基化对失活机理的影响。与其他硫基一样，三重态流形通过吸收暗的最低单线态激发态填充了高量子产率。本研究的重点是最低的三重态和两个最小值的作用，具有硫的平面外和稍微像船的几何形状，在系统间穿越动力学回到基态。
The ultrafast internal conversion and intersystem crossing dynamics of 2-thiouracil (2TU) and 2-thiothymine (2TT) are studied using time-resolved photoelectron spectroscopy to investigate the effect of methylation on the deactivation mechanism. Like other thiobases, the triplet manifold is populated with high quantum yields via the lowest singlet excited state, which is dark in absorption. This study focuses on the lowest triplet state and the role of two minima, with sulfur-out-of-plane and slightly boat-like geometries, in the intersystem crossing dynamics back to the ground state.