A highly selective and sensitive fluorescent sensor for relay recognition of Zn2+ and HSO4(-)/H2PO4- with 'on-off' fluorescent responses

摘要

A simple and effective fluorescent sensor bearing pyridine units was designed and synthesized. The sensor can detect Zn2+ with high selectivity accompanied by a distinct fluorescence turn-on response, inducing the fluorescent color markedly changed from darkness to bright green. The limit of detection (LOD) was calculated as 8.56 x 10(-9) M with a good linearity (R = 0.95943). In addition, the chelate of sensor with Zn2+ can further recognize H2PO4-/HSO4- with notable fluorescence quenching behaviors over other anions and the LODs were as low as 3.44 x 10(-6) M (R = 0.99762) and 3.84 x 10(-6) M (R = 0.99315), respectively.