Evidence of a Photoinduced Electron-Transfer Mechanism in the Fluorescence Self-quenching of 2,5-Substituted Selenophenes Prepared through In Situ Reduction of Elemental Selenium in Superbasic Media
作者:Helena Domingues de Salles、Felipe Lange Coelho、Douglas Bernardo Paixão、Cristina Aparecida Barboza、Daniel da Silveira Rampon、Fabiano Severo Rodembusch、Paulo Henrique Schneider
DOI:10.1021/acs.joc.1c00874
日期:2021.8.6
solvents and substituents are shown to play a role in the fluorescence quantum yield values. In addition, a fluorescence self-quenching behavior could be observed, related to a photoinduced electron-transfer mechanism. Theoretical calculations performed at the MP2/ADC(2)/cc-pVDZ level of theory were performed in order to investigate the photophysical features of this series of selenophene derivatives.
从超碱性介质中的元素硒和 1,3-二炔描述了一系列新的 2,5-二取代硒酚衍生物。在 KOH/DMSO 系统中元素硒的活化允许在室温下与共轭二炔环化。环化反应扩展到范围广泛的官能团,对此光物理学进行了实验和理论研究。硒酚衍生物在 UV-A 区域呈现最大吸收,在紫到蓝区域呈现荧光发射。正如 Strickler-Berg 关系所预测的那样,获得的荧光衰减曲线显示具有快速荧光寿命(~0.118 ns)的单指数衰减。一般来说,在这两项研究中,没有观察到溶剂极性对吸收和发射最大值位置的依赖性。另一方面,显示溶剂和取代基在荧光量子产率值中起作用。此外,还可以观察到与光致电子转移机制有关的荧光自猝灭行为。在 MP2/ADC(2)/cc-pVDZ 理论水平上进行的理论计算是为了研究这一系列硒酚衍生物的光物理特征。