A highly selective fluorescent ‘turn-on’ chemosensor for Zn2+based on a benzothiazole conjugate: their applicability in live cell imaging and use of the resultant complex as a secondary sensor of CN−

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Abstract
A benzothiazole derivative linked “off-on” multi-responsive and selective chemosensor 3 has been synthesized and evaluated for cation recognition properties. The receptor 3 shows a high sensitivity and selectivity for Zn2+ through a ‘turn-on’ fluorescence response over the other tested cations with a detection limit as low as 0.67 μM. The receptor 3 was successfully applied for the detection of Zn2+ in live HeLa cells. Then, the Zn2+ complex of receptor 3 was also used for cyanide detection and recognition.