Design, Synthesis, and Biological Application of A-D-A Type Boranil Fluorescent Dyes

Acceptor–donor–acceptor boranil fluorescent dyes, CSU-BF-R (R = H, CH 3 , and OCH 3 ), were developed with strong red fluorescence and large Stokes shifts. CSU-BF-OCH3 could selectively sense intracellular hypochlorous acid in living cells and zebrafish.