Fluorescence sensing on chlortetracycline of a Zn-coordination polymer based on mixed ligands
A 1D Zn-based coordination polymer,{[Zn(L)(Phen)]·H2O}n(Zn-CP),was synthesized by the solvother-mal method using 2,2'-thiodiisonicotinic acid(H2L)and 1,10-phenanthroline(Phen)as ligands.The structure of Zn-CP was characterized by single-crystal X-ray diffraction,powder X-ray diffraction,infrared analysis,elemental anal-ysis,and thermogravimetric analysis.The results of the fluorescence studies demonstrated that Zn-CP exhibited a fluorescence quenching response to the chlortetracycline(CTC).In addition,Zn-CP exhibited excellent sensitivity and a rapid response time of 30 s,while maintaining a high detection efficacy after five cycles.A strong linear rela-tionship was observed within the detection range of 5.0-40.0 µmol·L-1,with a detection limit of 72.9 μmol·L-1.The fluorescence mechanism studies indicate that the quenching sensing effect of Zn-CP on CTC is a consequence of energy competition absorption.CCDC:2372591.
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