高等学校化学学报 ›› 1999, Vol. 20 ›› Issue (1): 14.

• 论文 • 上一篇    下一篇

新奇的双帽 pseudo-Keggin 结构磷钼钒酸盐的水热合成、晶体结构、性质及其量子化学计算

许岩, 徐吉庆, 郭纯孝, 杨国昱, 王仁章, 孙浩然   

  1. 吉林大学化学系, 长春 130023
  • 收稿日期:1997-11-24 出版日期:1999-01-24 发布日期:1999-01-24
  • 基金资助:

    国家自然科学基金

Hydrothermal Synthesis,Structure,Properties and Quantum Chemistry Calculation of a Novel Bicapped Pseudo Keggin Polymolybdovanadophosphate

XU Yan, XU Ji-Qing, GUO Cun-Xiao, YANG Guo-Yu, WANG Ren-Zhang, SUN Hao-Ran   

  1. Department of Chemistry, Jilin University, Changchun, 130023
  • Received:1997-11-24 Online:1999-01-24 Published:1999-01-24

摘要: 报道了一种新奇的磷钒酸盐[NH4]4H[PMo8V4V2O42]·24H2O的合成方法,用元素分析、EPR、IR、UV谱和TG等手段进行了表征,并用X射线衍射法测定了晶体结构.结果表明,该杂多酸盐属于四方晶系,空间群P4/mnc,a=b=1.2592(2)nm,c=1.7565(4)nm,V=2.7848(8)nm3,Z=2.杂多阴离子具有双帽pseudoKeggin结构,不仅其中的8个金属位置被V和Mo无序占有,而且整个磷钼钒酸盐杂多阴离子的取向也是无序的.还应用EHMO方法研究了簇阴离子的电子结构.

关键词: 双帽pseudo-Keggin结构, 磷钼钒酸盐, 水热合成, 晶体结构, 电子结构

Abstract: The novel molybdovanadophosphate, [NH4]4H[PMo8V4V2O42]·24H2O was synthe sized and charaterized by element ary analysis, EPR, IR, UV spectra and Xray diffraction.The parameters of crystal structure of The compound are tetragonal, space group P4/mnc, a=b=1.2592(2)nm, c=1.7565(4)nm, V=2.7848(8)nm3, Z=2, Dc=2.721 g/cm3, F(000)=2220, μ=28.64cm-1and R=0.0778.The heteropolyanion has a novel bicappedp seudo Keggin structure, in which notonly The eight metalatom positions are randomly dist ributed by four vanadium and four molybdium atoms, but also the central PO4 tetrahedra andw hole cluster anion are disordered.The electron structure of the cluster anion was discussed byusing EHMO method.

Key words: Bicapped pseudo Kegg in structure, Molybdovanadophosphate, Hydrothermal synthesis, Crystal structure, Electron structure

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