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A novel chemosensor 2-(( Z )-((( 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/H 2 O (3:2, v/v; pH = 7.20) solution. The sensor could respond effectively to the stimulation of CN − 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 × 10 −7 M. Test strips containing PX were also prepared, which could act as a practical colorimetric tool to detect CN − in aqueous media. [ABSTRACT FROM AUTHOR]

In this paper, we have designed and synthesized a novel sensor L1 based on asymmetric double-azine derivatives, which showed both “naked eye” recognition and fluorescence responses for CN − in DMSO/H 2 O (v/v = 4:1, pH = 7.20) solution. This simple sensor L1 could distinguish CN − from coexisting anions via the way of deprotonation and sensing mechanism of intramolecular charge transfer (ICT), and the minimum detection limit on fluorescence response of the sensor L1 towards CN − was down to 9.47 × 10 − 7 M. Moreover, we have successfully utilized the sensor L1 to detect CN − in bitter almond. Test strips containing L1 were also prepared, which could act as a practical colorimetric tool to detect CN − in aqueous media. [ABSTRACT FROM AUTHOR]

A novel benzothiazole derivativeJas a fluorescent chemosensor for Zn2+has been designed and synthesized. The chemosensorJexhibits high selectivity and sensitivity to Zn2+as fluorescence “turn-on” behavior, which the other cations do not make sense. The detection limit calculated by fluorescence titration method was 1.64 × 10−8M. Furthermore, the generatedJ-Zn2+ensemble could recover the enhanced fluorescence upon the addition of EDTA generating an “on-off-on” recycle. In addition, the test strip based onJwas fabricated, which could act as a convenient and efficient Zn2+test kit. [ABSTRACT FROM PUBLISHER]

A novel highly selective chemosensor S1 for cyanide based on unsymmetrical azine derivative was successfully designed and synthesized, which showed both colorimetric and fluorescence turn-on responses for cyanide ions in aqueous. This structurally simple chemosensor could detect CN − anion over other anions in aqueous solution DMSO/H 2 O (v/v = 3:2) undergo deprotonation reaction. Results showed that the chemosensor S1 exhibited 50 fold enhancement in fluorescence at 530 nm and showed an obvious change in color from colorless to yellow that could be detected by naked eye under the UV-lamp after the addition of CN − in aqueous solution. Moreover, the detection limit on fluorescence response of the sensor to CN − is down to 6.17 × 10 − 8 M by titration method. Test strips based on S1 were obtain, which could be used as a convenient and efficient CN − test kit to detect CN − in aqueous solution. [ABSTRACT FROM AUTHOR]