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Highly Reduced,PoIyoxo(alkoxo)vanadium(III/IV) Clusters

机译:高度还原的聚氧(烷氧基)钒(III / IV)团簇

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A family of high nuclearity oxo(alkoxo)vanadium clusters in un-precedentedly low oxidation states is reported,synthesised from simple vanadium diketonate precursors in alcohols under solvothermal conditions.Crystal structures of [V18(O)12(OH)_2-(H2O)4(EtO)22(O2CPh)6(acac)2] (1),[V16Na2(O)18(EtO)16(EtOH)2(O2CPh)_6-(HO2CPh)2]_(infinity) (2),[V13(O)13(EtO)_(15)-(EtOH)(RCO2)3] in which R=adamantyl (3) or Ph3C (4),and [V11(O)12-(EtO)13(EtOH)(Ph3CCO2)2(MePO3)] (5) are reported,revealing these to be {V_(16)~(III)V_2~(IV)} (1),{V_9~(III)V_3~(IV)V~v} (3 and 4) and {V_3~(III)V_8~(IV)} (5) clusters,while 2 consists of isolated {V_8~(III)V_8~(IV)} clusters bridged into polymeric chains by {Na_2-(OEt)_2} fragments.Solvothermal conditions are essential to the formation of these species,and the level of oxidation of the isolated clusters is in part controlled by the crystallisation time,with the lowest mean-oxidation-state species being isolated by direct crystallisation on controlled cooling of the reaction solutions.
机译:据报道,在溶剂热条件下,由简单的二酮钒酸乙酯前体在醇中合成了一系列高核氧(烷氧基)钒簇,其氧化态处于前所未有的低态。[V18(O)12(OH)_2-(H2O)的晶体结构4(EtO)22(O2CPh)6(acac)2](1),[V16Na2(O)18(EtO)16(EtOH)2(O2CPh)_6-(HO2CPh)2] _(无穷大)(2), [V13(O)13(EtO)_(15)-(EtOH)(RCO2)3],其中R =金刚烷基(3)或Ph3C(4),和[V11(O)12-(EtO)13(EtOH) )(Ph3CCO2)2(MePO3)](5)的报道,显示为{V_(16)〜(III)V_2〜(IV)}(1),{V_9〜(III)V_3〜(IV)V 〜v}(3和4)和{V_3〜(III)V_8〜(IV)}(5)簇,而2由孤立的{V_8〜(III)V_8〜(IV)}簇组成,这些簇通过{ Na_2-(OEt)_2}片段。溶剂热条件对于这些物种的形成是必不可少的,并且分离的簇的氧化水平部分受结晶时间的控制,最低的平均氧化态物种通过在控制冷却过程中直接结晶反应溶液。

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