A dual luminescent chemosensor derived from a europium(III) metal-organic framework for quantitative detection of phosphate anions and acetylacetone in aqueous solution

A luminescent europium(III) metal-organic framework (MOF) {(Eu(bcpt)(HCOO)]center dot 0.5H(2)O}(n) (1) has been synthesized under solvothermal conditions by adopting a elongated ligand encompassing three aromatic rings groups, 3,5-bis(4'-carboxy-phenyl)-1,2,4-triazole (H(2)bcpt). This MOF demonstrates a binodal (4,10)-connected framework with a Schlafli symbol of {3(4).4(2)}{3(8).4(14).5(16).6(7)}, in which the adjacent Eu(III) ions can be bridged by HCOO- anions to form a 2D layer and further connected by H(2)bcpt as a pillar to generate a 3D pillared-layer structure. Notably, such a binodal (4, 10)-connected topological structure is rarely explored in MOF family, particular of lanthanide(III) MOF chemistry. Furthermore, 1 could be exploited as a dual luminescent chemosensor to probe PO43- anions and acetylacetone in aqueous solution with the average quenching Ksv values of 1.27 x 10(4) L mol(-1) and 322 L mol(-1), and the detection limits of 2.74 x 10(-4) mol L-1 and 1.21 x 10(-4) mol L-1, respectively.