Simple turn-on fluorescent probe for ultrafast and highly selective detection of hydrogen sulfide in aqueous solutions.

5H-Benzimidazo[1,2-c]quinazoline-6-thione (BI-QT), was synthesized as a benzimidazole-based probe to detect HS. BI-QT exhibits a fluorescent "turn-on" response in DMSO/HO (9:1, HEPES 10 mM, pH 7.4) upon the addition of HS.

Simple turn-on fluorescent chemosensor for ultrafast and highly selective trace-level detection of Cu ions in aqueous solutions.

A benzimidazole-based probe, BIPMA (2-(1H-benzo[d]imidazol-2-yl)-N-(pyridin-2-ylmethyl)aniline), was designed and synthesized to detect Cu ions. BIPMA exhibited a fluorescent "turn-on" mechanism when bound to Cu ions in an acetonitrile/water mixture (5:5, v/v, HEPES 10 mM, pH 7.4) owing to the synergistic effect of the chelation-enhanced fluorescence and internal charge-transfer mechanisms.

An ESIPT-based fluorescent turn-on probe with isothiocyanate for detecting hydrogen sulfide in environmental and biological systems.

A probe with an isothiocyanate group was synthesized and evaluated for its HS sensing ability. Upon addition of HS, the probe exhibited ratiometric properties during absorption with a red-shift. The probe exhibited fluorescent off-on responses towards HS via the ESIPT process, due to the conversion of isocyanate into amine.