Benzothiazole and indole based dye sensor: Optical switching functions with pH stimuli

A comprehensive review in current developments of benzothiazole-based molecules in medicinal chemistry

“…Being heterocyclic compounds, BTA derivatives find use in various branches of chemical research, for instance, in polymer chemistry [27,28], dyes [29,30], drugs [31] etc. BTA salts have been used in silver photography, essentially as sensitizing dyes [32].…”

Small-molecule fluorogenic probes based on indole scaffold

“…In 2012, Seon-Yeong Gwon et al designed an indole-based dye chemosensor 49 , showing a pH-triggered absorption and fluorescence emission properties on acid and alkali addition. 91 Probe 49 contains an indole unit as an electron-donating as well as an H-bond unit and benzothiazole moiety as an electron-acceptor unit. The chemosensing properties of dye 49 due to pH trigger stimulus were determined by the addition of acid and alkali in acetonitrile (1 × 10 −5 M).…”