Two luminescent d10 metal coordination polymers for selective and sensitive detection of Hg2+ ions and pefloxacin in aqueous solution

Abstract

Detection of heavy ions and antibiotics employing fuorescent sensing techniques has been one of the most active research fields in chemistry. Based on 1,3-bis(2-ethylbenzimidazol-1-ylmethyl)benzene (L) and 2,5-dichloroterephthalic acid (H2DCTP) mixed ligands, two new coordination polymers [Cd2L(DCTP)2·H2O]n (1) and [ZnL(DCTP)]n (2) were synthesized by changing the metal ions under solvothermal conditions. 1 expresses a double-layer V-shaped 1D chain, which further extended into a 2D supramolecular network through classic O–H⋯O hydrogen bonding interactions. 2 features a 2D 4-connected sql layer. The two CPs perform high thermal and pH stability. 1 and 2 are the first CPs to detect Hg2+ ions and pefloxacin by fluorescence quenching with low detection limits and superior recyclability.