A fluorescence sensor based on Cd(II) coordination polymer for recognition of nitrofurantoin

A new 2D coordination polymer (CP)[Cd-2(L)(dbpy)(2),(HCOO)(H2O)]center dot 3H(2)0 (1), where H3L=5-((4-carboxybenzyl)amino)isophthalic acid and dbpy=5,5 '-dimethy1-2,2 '-bipyridine, was successfully synthesized by solvothermal method. The structure of CP 1 was characterized by single-crystal X-ray diffraction, powder X-ray diffraction, elemental analysis, IR, thenriogravimeiric analysis, and solid :fluorescence spectroscopy. The structure of CP 1 can be simplified into a 3-connected 21) hcb layer with the point symbol of (6(3)). More importantly, CP 1 could selectively and sensitively recognize antibiotic nitrofurantoin in an aqueous medium by fluorescence quenching effect and had a low detection limit (LOD=0.19 mu mol center dot L-1). In addition, the fluorescence quenching mechanism may be caused by the fluorescence resonance energy transfer. CCDC: 2241100.