Lanterna Anabel E, González-Béjar María, Frenette Mathieu, Scaiano Juan C
Center of Catalysis Research and Innovation (CCRI) and Department of Chemistry and Biomolecular Sciences, University of Ottawa, Canada.
Photochem Photobiol Sci. 2017 Aug 9;16(8):1284-1289. doi: 10.1039/c7pp00121e.
The photophysical behaviour of 7-mercapto-4-methylcoumarin (C-SH) and derivatives has been studied in different solvents. In contrast to 7-hydroxy-4-methylcoumarin, C-SH shows poor emission, but high fluorescence when the thiol is alkylated. The origin and character of the lowest singlet states are discussed, specifically proposing that the thione-like C[double bond, length as m-dash]S resonance form plays a key role in excited state deactivation in C-SH.
对7-巯基-4-甲基香豆素（C-SH）及其衍生物在不同溶剂中的光物理行为进行了研究。与7-羟基-4-甲基香豆素不同，C-SH发射较弱，但硫醇烷基化后荧光增强。讨论了最低单重态的起源和性质，特别提出硫酮样C=S共振形式在C-SH的激发态失活中起关键作用。
