A benzo[e]indole[2,1-b][1,3]benzooxazine derivative as a highly sensitive CN− sensor by means of UV–visible difference spectroscopy

A visible-light-gated donor–acceptor Stenhouse adduct chemosensor: synthesis, photochromism and naked-eye colorimetric/fluorometric sensing of Al3+ and Zn2+

“…Recently, various photochromic compounds have been constructed as chemosensors for metal ions, and their main strategy is to combine responsive functional groups with photochromic molecules. 22–29 Unlike general metal-ion dual chemosensors, the fusion of a photochromic unit and responsive groups would endow the chemosensor with a gating property. Donor–acceptor Stenhouse adducts (DASAs) are a novel kind of organic negative photoresponsive switch discovered by R. D. Alaniz.…”