seven-membered 8π azepine was employed as a key core of near-infrared (NIR) dyes. The Janus-faced effect of the thiophene-fused structure, which enhances the antiaromaticity of the azepine ring and, at the same time, relieves the antiaromaticity through the deformation from the aromatic thiophene ring to the quinoidal thienyl moiety, is effective to attain the largely red-shifted absorption and emission
七元 8π 氮杂卓被用作近红外 (NIR)
染料的关键核心。
噻吩稠合结构的Janus面效应增强了吖庚因环的反芳香性,同时通过芳香族
噻吩环向醌型
噻吩基部分的变形减轻了反芳香性,有效地获得了较大的反芳香性。近红外区域的红移吸收和发射。