两个基于八钼酸盐的无机-有机杂化材料的合成、结构和光催化性能  

Synthesis,Structure and Photocatalytic Properties of Two Octamolybdate-based Inorganic-organic Hybrid Materials

作　　者：田锋 沈楠[2] 何明阳 TIAN Feng;SHEN Nan;HE Mingyang(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510641,China;School of Petrochemical Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510641 [2]常州大学石油化工学院,江苏常州213164

出　　处：《合成化学》2023年第3期169-176,共8页Chinese Journal of Synthetic Chemistry

基　　金：国家自然科学基金资助项目(21676030)。

摘　　要：通过水热法成功合成了两个新的基于(β-Mo_(8)O_(26))^(4-)构型的无机-有机杂化材料,分子式分别为{[Ni(β-Mo_(8)O_(26))(H_(2)O)_(4)](H_(2)Fbix)2H_(2)O}_(n)(1)和{[Co(β-Mo_(8)O_(26))(H_(2)O)_(4)](H_(2)Fbix)2H_(2)O}_(n)(2)(Fbix=2,3,5,6-四氟-二(1,4-咪唑-1-甲基)苯)。利用X-射线单晶衍射、X-射线粉末衍射、红外光谱、热重分析和元素分析等对该化合物的结构和性能进行了表征。晶体结构分析表明:化合物1和2为同构化合物。在化合物1中,扭曲八面体构型的Ni^(Ⅱ)与两个β-[Mo_(8)O_(26)]^(4-)单元和4个水分子配位形成一维无机阴离子直链,质子化的Fbix配体未配位,起到抗衡阳离子的作用。在化合物1的结构中,一维无机链[Ni(β-Mo_(8)O_(26))(H_(2)O)_(4)]^(2-)与H_(2)Fbix和客体水分子之间通过氢键堆积形成最终的3D结构。此外,还对化合物1和2进行了光催化性能测试。结果表明:化合物1和2在紫外光作用下可以有效非均相催化降解亚甲基蓝染料(MB),催化剂循环使用4次后其结晶度和光催化性能均没有明显降低。Two inorganic-organic hybrid materials based onβ-(Mo_(8)O_(26))^(4-),namely{[Ni(β-Mo_(8)O_(26))(H_(2)O)_(4)](H_(2)Fbix)2H_(2)O n(1)},{[Co(β-Mo_(8)O_(26))(H_(2)O)_(4)](H_(2)Fbix)2H_(2)O}_(n)(2)(Fbix=2,3,5,6-tetrafluoro-1,4-bis(imidazol-1-ylmethyl)benzene)were hydrothermally synthesized and structurally characterized by single crystal X-ray diffraction,powder X-ray diffraction,infrared spectroscopy,thermogravimetric analysis and elemental analysis.Single crystal X-ray analysis reveals that compounds 1 and 2 are isostructural.Take 1 as an example,each six-coordinated Ni^(Ⅱ)ion is surrounded by twoβ-(Mo_(8)O_(26))^(4-)units and four water molecules,forming an inorganic anionic linear chain.Protonated H_(2)Fbix ligands act as guest and balance the charge of anionic framework.The inorganic chain[Ni(β-Mo_(8)O_(26))(H_(2)O)_(4)]_(n)^(2n-),H_(2)Fbix ligand and water guest molecules were further connected by hydrogen bonds to generated the final 3D structure.Both compounds 1 and 2 can serve as heterogeneous catalysts and show good photocatalytic activity for the degradation of MB dye under UV irradiation.Additionally,the catalyst could be easily recovered and reused four times without significantly loss for its crystallinity and activity.

关 键 词：多金属氧酸盐 (β-Mo_(8)O_(26))^(4-) 无机-有机杂化材料 晶体结构 合成 光催化 

分 类 号：O62[理学—有机化学]