A novel colorimetric and "turn-on" fluorimetric chemosensor for selective recognition of CN- ions based on asymmetric azine derivatives in aqueous media

A novel chemosensor 24(2)-(((E)-quinolin-2-ylmethylene)hydrazono)methyl)phenol PX has been successfully designed and synthesized, which showed both colorimetric and "turn-on" fluorescence responses for CN in DMSO/H20 (3:2, v/v; pH = 7.20) solution. The sensor could respond effectively to the stimulation of CINI ions via deprotonation and sensing mechanism of intramolecular charge transfer (ICT). Moreover, the sensor PX was successfully utilized to detect CN in bitter almond, and the detection limit on fluorescence response of PX towards CN was down to 4.5 x 10(-7) M. Test strips containing PX were also prepared, which could act as a practical colorimetric tool to detect CN in aqueous media. (C) 2018 Elsevier B.V. All rights reserved.