Acid-Base-Responsive Intense Charge-Transfer Emission in Donor-Acceptor-Conjugated Fluorophores
作者:Toshifumi Inouchi、Takuya Nakashima、Tsuyoshi Kawai
DOI:10.1002/asia.201402463
日期:2014.9
report on the synthesis and acid‐responsive emission properties of donor–acceptor (D–A) molecules that contain a thienothiophene unit. 2‐Arylthieno[3,2‐b]thiophenes were conjugated with an N‐methylbenzimidazole unit to form acid‐responsive D–A‐type fluorophores. The D–A‐conjugated fluorophores showed intense intramolecular charge‐transfer (ICT) emission in response to acid. The effect of the substitution
本文中我们报告了含有噻吩并噻吩单元的供体-受体(DA)分子的合成和酸响应发射特性。2-Arylthieno [3,2- b ]噻吩与N偶联-甲基苯并咪唑单元,形成对酸敏感的D-A型荧光团。D–A共轭的荧光团显示出对酸的强烈分子内电荷转移(ICT)发射。取代对其光物理性质及其溶剂依赖性的影响表明质子化的D–A分子中ICT的发射没有扭曲。讨论了2-芳基噻吩并噻吩作为供体的喹诺酮特性,因为它被认为有助于抑制激发态下的分子扭曲,因此降低了非辐射速率常数,从而导致强烈的ICT发射。酸碱敏感的三色发射也可以通过在供体部分引入碱敏感的酚基来实现。