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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >A new mixed-valent high nuclearity polyoxovanadate cluster based on the {V _(18)O _(42)} archetype
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A new mixed-valent high nuclearity polyoxovanadate cluster based on the {V _(18)O _(42)} archetype

机译:基于{V _(18)O _(42)}原型的新的混合价高核聚氧钒酸盐簇

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摘要

The compound (enH _2) _6[HV _(16) ~(IV)V _2 ~VO _(42)(Cl)]·Cl 2·2H 2O (en = 1,2-diaminoethane) (1), was synthesized under solvothermal conditions employing the amine as reducing agent. Compound 1 crystallizes in the orthorhombic space group Pbcn with a = 13.3343(7), b = 22.3697(3), c = 19.8012(11) ?, V = 5906.4(5) ? ~3, Z = 4. The central structural motif is a polyoxovanadate anion [HV _(18)O _(42)(Cl)] ~(10-) being composed of 18 VO _5 square pyramids. The cluster shell contains a (VO _5) _8 ring in the vertical plane and two (VO _5) _5 pentagons above and below the ring which are twisted by 45° against each other.Bond valence sum analysis indicates a mixture of V ~(IV)/V ~V atoms with a ratio of 16:2, which is further supported by redox titration. An arrangement of these clusters within the (001) plane leads to the formation of channels hosting the protonated amine molecules, the Cl ~- anions and water molecules which are joined by an extended hydrogen bonding network. TG-MS investigation shows a thermal decomposition reaction in at least three steps. The optical band gap was determined as 2.5 eV.
机译:合成了化合物(enH _2)_6 [HV _(16)〜(IV)V _2〜VO _(42)(Cl)]·Cl 2·2H 2O(en = 1,2-二氨基乙烷)(1)在溶剂热条件下,采用胺作为还原剂。化合物1在正交晶空间群Pbcn中结晶,其a = 13.3343(7),b = 22.3697(3),c = 19.8012(11)δ,V = 5906.4(5)δ。 〜3,Z =4。中心结构基序是由18个VO _5方金字塔组成的聚氧钒酸盐阴离子[HV _(18)O _(42)(Cl)]〜(10-)。簇壳在垂直平面上有一个(VO _5)_8环,在环的上下分别有两个(VO _5)_5五边形,它们相互扭转45°。键合价分析表明V〜(IV )/ V〜V原子的比例为16:2,氧化还原滴定进一步支持了这一点。这些簇在(001)平面内的排列导致形成容纳质子化胺分子,Cl-阴离子和水分子的通道,这些通道通过扩展的氢键网络连接。 TG-MS研究显示至少三个步骤发生了热分解反应。光学带隙确定为2.5eV。

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