Synthesis and characterization of MOFs constructed from 5-(benzimidazole-1-yl)isophthalic acid and highly selective fluorescence detection of Fe(iii) and Cr(vi) in water

摘要

In this work, four novel metal-organic frameworks [Cd(bipa)](n)(1), {[Zn-2(bipa)(2)]center dot 2C(2)H(5)OH}(n)(2), {[Co(bipa)]center dot C2H5OH}(n)(3), {[Ni(bipa)(2)]center dot 2DMA}(n)(4), (H(2)bipa = 5-(benzimidazole-1-yl)isophthalic acid) were successfully synthesized under solvothermal conditions. Complexes1-4were characterized by powder X-ray diffraction, elemental analysis, infrared spectroscopy and thermogravimetric analysis. Interestingly, the coordination patterns and 3D network structures of complexes1-3are very similar, while complex4is relatively unique. Complexes1-2exhibit potential fluorescent properties. Complex1can selectively and sensitively detect trace Fe(iii) and Cr(vi) in water by fluorescence quenching detection, and the quenching mechanism is further discussed.