Dibenzo[
<i>b</i>
,
<i>f</i>
][1,4,5]chalcogenadiazepine Photoswitches: Conversion of Excitation Energy into Ring Strain
作者:Xin Shen、Cefei Zhang、Fengying Lan、Zhishan Su、Yuanqin Zheng、Tingting Zheng、Qin Xiong、Xinyu Xie、Guangxi Du、Xiaohu Zhao、Changwei Hu、Pengchi Deng、Zhipeng Yu
DOI:10.1002/anie.202209441
日期:2022.10.10
Chalcogen-bridged seven-membered cyclic azobenzenes, dibenzo[b,f][1,4,5]chalcogenadiazepine (DBChD), exhibit distinct photo-switching characters with a high-energy E-configuration, especially for sulfur-bridged DBTD with an energy transduction efficiency of 21 % (η) under 445 nm laser activation. Introducing oligothiophene π-EDG on DBTD could further elevate the absorption λmax and coefficient ϵ, reaching
硫属元素桥接的七元环状偶氮苯二苯并[ b , f ][1,4,5]硫属二氮杂卓 (DBChD) 具有高能 E 构型的独特光开关特性,特别是对于具有高能 E 构型的硫桥接 DBTD在 445 nm 激光激活下,能量转换效率为 21% (η)。在 DBTD 上引入低聚噻吩 π-EDG 可以进一步提高吸收 λ max和系数 ϵ,达到 η=29 %。