posted on 2022-11-09, 21:35authored byXiaoming Zhu, Lu Feng, Shixian Cao, Jianguo Wang, Guangle Niu
The effect of acceptor unit order on the photophysical
properties
of two distinct donor–acceptor–acceptor conjugated fluorescent
acrylonitriles, TPA-AN-PhBT and TPA-BT-ANPh, was systematically investigated.
Compared with faintly emissive TPA-AN-PhBT in solution, TPA-BT-ANPh
showed strong red-shifted fluorescence. TPA-AN-PhBT and TPA-BT-ANPh
exhibited enhanced green and deep red emissions with remarkable fluorescence
quantum yields up to 44% in the solid state. In addition, TPA-BT-ANPh
possessed stronger two-photon absorption than TPA-AN-PhBT. Furthermore,
these biocompatible dyes served as excellent fluorescent markers for
specific lipid droplet imaging.