In this work, four novel metal–organic frameworks [Cd(bipa)]_n (1), {[Zn₂(bipa)₂]·2C₂H₅OH}_n (2), {[Co(bipa)]·C₂H₅OH}_n (3), {[Ni(bipa)₂]·2DMA}_n (4), (H₂bipa = 5-(benzimidazole-1-yl)isophthalic acid) were successfully synthesized under solvothermal conditions. Complexes 1–4 were characterized by powder X-ray diffraction, elemental analysis, infrared spectroscopy and thermogravimetric analysis. Interestingly, the coordination patterns and 3D network structures of complexes 1–3 are very similar, while complex 4 is relatively unique. Complexes 1–2 exhibit potential fluorescent properties. Complex 1 can selectively and sensitively detect trace Fe(III) and Cr(VI) in water by fluorescence quenching detection, and the quenching mechanism is further discussed.

中文翻译：

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5-(苯并咪唑-1-基)间苯二甲酸MOFs的合成与表征及水中Fe(III)和Cr(VI)的高选择性荧光检测

在这项工作中，四种新型金属-有机骨架[Cd(bipa)] _n ( 1 ), {[Zn ₂ (bipa) ₂ ]·2C ₂ H ₅ OH} _n ( 2 ), {[Co(bipa)]·在溶剂热条件下成功合成了C ₂ H ₅ OH} _n ( 3 ), {[Ni(bipa) ₂ ]·2DMA} _n ( 4 ), (H ₂ bipa = 5-(benzimidazole-1-yl)isophthalic acid) . 配合物1-4通过粉末X射线衍射、元素分析、红外光谱和热重分析对其进行了表征。有趣的是，复合体1-3的协调模式和 3D 网络结构非常相似，而复合体4则相对独特。配合物1-2表现出潜在的荧光特性。Complex 1通过荧光猝灭检测可以选择性、灵敏地检测水中痕量Fe( III )和Cr( VI )，并进一步探讨了猝灭机理。