Transition metal complexes constructed by pyridine-amino acid: fluorescence sensing and catalytic properties

摘要

Four amino acid Schiff base complexes-one with a 3D network structure ({[Cd-2(PYSA)(2)(H2O)]center dot 3H(2)O}(n) (1)) and the other three with a supramolecular network structure {[Co(PYSA) (H2O)(2)]center dot H2O}(n) (2), {([Zn(PYSA)(H2O)(2)]center dot H2O}(n) (3), {[Mn(PYSA)(H2O)(2)]center dot H2O}(n) (4)), (PYSA = (S-2-(pyridine-4-ylmethylamino) succinic acid)-were successfully obtained under hydrothermal conditions. Among the four complexes, photoluminescence analysis revealed that complex 1 exhibited high selectivity and sensitivity in the detection of iron ions. In particular, it was able to qualitatively and quantitatively detect iron ions at low concentrations without interference from other ions. With a Fe3+ concentration of 0.01 mol/L, the detection limit was 0.81 mu M, K-sv = 2.46 x 10(4) L/mol. In addition, complex 2 exhibited excellent catalytic performance toward 4-nitrophenol (4-PNP).