Manganese(II)-based coordination polymer as a bi-responsive luminescent sensor for highly selective detection of picric acid and CrO42− ion

A novel luminescent coordination polymer (CP) {Mn(H2abtc)(DMF)(H2O)2·2H2O}n (1), (H4abtc = 3,3′,5,5′-azobenzenete-tracarboxylic acid), has been successfully prepared by the solvothermal reaction of H4abtc and MnCl2·4H2O, which has been further characterized by single-crystal X-ray diffraction, elemental analysis, thermogravimetric analysis (TGA), infrared (IR) spectrum and powder X-ray diffraction (PXRD). 1 can serve as a potential dual response luminescence sensor for picric acid (PA) and CrO42− via luminescence quenching with good selectivity and sensitivity. The quenching behavior of PA toward 1 can be ascribed to the combined effects of electron and resonance energy transfer mechanisms. And the quenching phenomenon of CrO42− to 1 can be explained by the electron transfer mechanism. A novel luminescent Mn(II)-based coordination polymer 1 has been successfully prepared. 1 can serve as a potential dual response luminescence sensor for Picric acid (PA) and CrO42− with good selectivity and sensitivity.