水热条件下以一种吡啶酰胺( pa )为有机配体,合成了一种新的Keggin型多酸阴离子[PMo12O40]3-基有机-无机杂化材料H3[(pa)2(PMo12O40)]·2H2O,利用X-射线单晶衍射技术确定了此化合物的晶体结构.测试结果表明此化合物分子式为C22 H25 Mo12 N6 O44 P,三斜晶系,P 1空间群,a=1.1084(5) nm,b=1.1229(5) nm, c=1.2322(5) nm,α=64.085(5)°,β=74.947(5)°,γ=69.487(5)°, V=1.2816(10) nm3, Z=1, Mr=2259.73, F(000)=1070,μ=2.983 mm-1,Dc=2.928 g/cm3,S=1.028,R=0.0349,wR =0.0891.结构解析证明,此化合物是由有机吡啶酰胺配体和无机Keggin型多酸阴离子构筑的一种二维超分子结构的无机-有机杂化材料,其中吡啶酰胺配体与[ PMo12 O40]3-多酸阴离子间存在的氢键起到了重要的作用.此外,对标题化合物在紫外光和太阳光下光催化降解亚甲基蓝的性能进行了测试.%A new Keggin-type polyoxometalate-based compound derived from a pyridyl-amide ligand H3 [(pa)2(PMo12O40)]·2H2O (pa = N-(pyridin-3-yl)isonicotinamide) has been prepared under the hy-drothermal environment. The single crystal X-ray diffraction reveals that this compound ( C22 H25 Mo12 N6 O44 P) is triclinic,P 1, a=1. 1084(5) nm,b =1. 1229(5) nm,c=1. 2322(5) nm,α=64. 085(5)°,β =74. 947 (5)°,γ=69. 487(5)°,V=1. 2816(10) nm3,Z=1,Mr = 2259. 73,F(000) =1070,μ=2. 983 mm-1,Dc =2. 928 g/cm3 ,S=1. 028,R=0. 0349,wR = 0. 0891. The structural analysis shows that the title compound is a two-di-mensional supramolecular layer constructed by the pyridyl-amide ligand ap and Keggin-type [ PMo12 O40 ] 3- ani-on. The hydrogen-bonding interactions between the ap ligands and the [PMo12O40]3- anions play the key role in forming the final supramolecular structure. Additionally, the photocatalytic properties of the title compound towards the degradation of methylene blue under the UV or sunlight have been studied.
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