A usf Zinc(II) Metal-Organic Framework as a Highly Selective Luminescence Probe for Acetylacetone Detection and Its Postsynthetic Cation Exchange

Abstract

A anionic zinc(II) metal-organic framework (MOF) {[(CH3)2NH2][Zn(FDA)(BTZ)2]}n (1) (H2FDA = furan-2,5-dicarboxylic acid and HBTZ = 1H-benzotriazole) was synthesized under solvothermal conditions. This MOF demonstrates a rare planar 4-connected usf topology and exhibits high thermal and chemical stabilities. Postsynthetic cation exchange of 1 with Cu2+, Co2+, and Ni2+ afforded a series of mixed-metal loaded MOFs: {[(CH3)2NH2][ZnxM1-x(FDA)(BTZ)2]}n (M2+@1) (M2+ = Cu2+, x = 0.59; M2+ = Co2+, x = 0.83; M2+ = Ni2+, x = 0.58). More importantly, 1 is investigated as a turn-off luminescent probe to sensitively and selectively detect acetylacetone with the detection limit of 0.647 μmol/L, which demonstrates the first anionic framework as a luminescence probe for effectively recognizing acetylacetone.