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Four hybrid compounds based on a new type of molybdates and a flexible tripodal ligand: synthesis, structures, photochemical and electrochemical properties

机译:基于新型钼酸盐和灵活的三脚架配体的四种杂化化合物:合成,结构,光化学和电化学性质

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The hydrothermal reaction of a mixture of (NH4)(6)Mo7O24 center dot 4H(2)O, a flexible tripodal ligand 1,3,5-tris-(imidazol-1-ylmethyl)-2,4,6-trimethylbenzene (TITMB) and metal salts at different temperatures resulted in four novel compounds, namely [H2TITMB](2)[Mo12O38]center dot 4H(2)O (1), [Zn(Mo2O7)(TITMB)] (2), [H3TITMB](2)[Cd(beta-Mo8O26)-(H2O)(2)(alpha-Mo8O26)]center dot 4H(2)O (3) and [H3TITMB](2)[Co(beta-Mo8O26)(H2O)(2)(alpha-Mo8O26)]center dot 4.5H(2)O (4). The structures of compounds 1, 2, 3 and 4 were explored with IR spectroscopy, thermal gravimetric analysis (TGA), PXRD, UV-vis diffuse reflectance spectra and single-crystal X-ray diffraction in the solid state. In 1 the new type of isopolymolybdate unit [Mo12O38](4-) shared ten distorted {MoO6} octahedra and two distorted {MoO5} tetragonal pyramid with four kinds of O atoms. And the unprecedented bimetallic oxide chain [Zn(Mo2O7)](n) in compound 2 consisted of trigonal bipyramids and octahedra through sharing edges. Both compounds 3 and 4 are 3-D octamolybdate-based inorganic-organic hybrids consisting of the polyacid [alpha-Mo8O26](4-) anions and novel infinite chains of [beta-Mo8O26](4-) anions covalently linked through [Cd(H2O)(2)](2+) groups or [Co(H2O)(2)](2+) groups. In addition, the electrochemical behavior and photocatalytic activities of the title compounds were also investigated.
机译:(NH4)(6)Mo7O24中心点4H(2)O与柔性三脚架配体1,3,5-三-(咪唑-1-基甲基)-2,4,6-三甲基苯( TITMB)和金属盐在不同温度下产生了四个新化合物,即[H2TITMB](2)[Mo12O38]中心点4H(2)O(1),[Zn(Mo2O7)(TITMB)](2),[H3TITMB ](2)[Cd(beta-Mo8O26)-(H2O)(2)(alpha-Mo8O26)]中心点4H(2)O(3)和[H3TITMB](2)[Co(beta-Mo8O26)(H2O )(2)(alpha-Mo8O26)]中心点4.5H(2)O(4)。化合物1、2、3和4的结构通过红外光谱,热重分析(TGA),PXRD,紫外可见漫反射光谱和固态单晶X射线衍射进行了研究。在1中,新型异多钼酸盐单元[Mo12O38](4-)共享十个扭曲的{MoO6}八面体和两个扭曲的{MoO5}八角锥,并带有四种O原子。化合物2中前所未有的双金属氧化物链[Zn(Mo2O7)](n)由三角形双锥体和八面体通过共享边组成。化合物3和4都是基于3-D八钼酸根的无机-有机杂化物,由杂酸[α-Mo8O26](4-)阴离子和通过[Cd共价连接] [β-Mo8O26](4-)阴离子的新型无限链组成(H2O)(2)](2+)组或[Co(H2O)(2)](2+)组。此外,还研究了标题化合物的电化学行为和光催化活性。

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