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以α H3 PMo12 O40 ·nH2 O ,La2 O3 和二甲基亚砜 (DMSO)为原料 ,在乙腈和水的混合溶剂中制得了一维锯齿链状配位聚合物 [{La(DMSO) 6(H2 O) }(PMo12 O40 )·H2 O] n.X射线单晶衍射结果表明 ,聚合物中金属配阳离子与杂多阴离子骨架通过Mo Od La Od Mo相连并形成一维无限链 ,每一个不对称结构单元中含一个结晶水 ,La3 + 的配位数为九 ,三帽三棱柱构型 ,配位氧原子分别来自 6个DMSO分子 ,1个H2 O分子和 2个相邻杂多阴离子的端氧 .晶体属于单斜晶系 ,P2 1/c空间群 ,a =1 3 916(3 )nm ,b =1 70 5 8(3 )nm ,c =2 475 0 (5 )nm ,β =99 16(3 )° ,Z =4,V =5 80 0 (2 )nm3 ,Dc=2 82 5g/cm3 ,R1=0 0 44 6,wR2 =0 0 871.IR光谱和X射线单晶衍射结果一致表明 ,在固态条件下配阳离子和杂多阴离子之间存在相互作用 .UV光谱表明 ,在稀的水溶液中 ,由于溶剂化作用 ,杂多阴离子与配阳离子处于解离状态 .热性质研究表明 ,形成标题化合物后 ,杂多阴离子的热稳定性与磷钼酸相比明显增强
One-dimensional serrated chain coordination polymer [{La (DMSO) 6 (α, β) was synthesized from α H3 PMo12 O40 · nH2O, La2 O3 and dimethylsulfoxide (DMSO) in a mixed solvent of acetonitrile and water H 2 O)} (PMo12 O40) · H 2 O] n X-ray diffraction results show that the metal cations and heteropolyanions in the polymer are connected by Mo Od La Od Mo and form a one-dimensional infinite chain. Each asymmetric structure The unit contains a crystal water, La3 + coordination number of nine, three cap triangular prism configuration, coordination oxygen atoms from six DMSO molecules, one H2O molecule and two adjacent heteropoly anion end oxygen . The crystal belongs to the monoclinic system, with a P2 1 / c space group, a = 1 3 916 (3) nm, b = 1 70 5 8 (3) nm, c = 2475 0 (3) °, Z = 4, V = 5 80 0 (2) nm3, Dc = 2 82 5 g / cm3, R1 = 0 0 446, wR2 = 0 0 871. The IR spectra are consistent with the X-ray single crystal diffraction results Shows that there is interaction between the cationic and heteropolyanions under solid state conditions.UV spectra show that the heteropolyanions are dissociated from the cations with the cations in dilute aqueous solution due to solvation.The thermal properties indicate that the formation of After the title compound, Thermal stability and polyanion phosphomolybdate significantly enhanced compared