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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Steric hindrance-dependent rational design and synthesis of three newKeggin-based supramolecular networks
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Steric hindrance-dependent rational design and synthesis of three newKeggin-based supramolecular networks

机译:依赖于立体势垒的三个新的基于Keggin的超分子网络的合理设计和合成

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摘要

Three supramolecular architectures based on a-Keggin-type polyoxometalates have been synthesizedhydrothermally, and their structures have been characterized by elemental analyses, infrared (IR)spectroscopy, X-ray photoelectron spectroscopy (XPS) and single crystal X-ray diffraction structureanalyses. [Ni(enMe)_2(H_20)_2]_2[Ni(enMe)_2PW~vI_9W~v_30_40].H_20 (1) (enMe = 1,2'-propanediamine) exhibitsa novel 2-D supramolecular sinusoidal layer through the interactions between transition metalcomplexes and 1-D covalent chains which are constructed from a-Keggin units bridged by transitionmetal complexes. [Ni(enMe)_2]_4{[Ni(enMe)_2][Ni(enMe)_2(H_20)AsW~vI_6W~v_4V_40_42]_26H 0 (2),6V4 IV4 - 42,2 j.- -2 -representing a 3-D supramolecular framework with 1-D channels, contains the first example of atungstate dimer with inorganic-organic composite surfaces built up from [Ni(enMe)_2]~2+cation bridgesand bi-capped a-Keggin polyoxometalate building blocks supporting the transition metal complex.[Ni(enMe)_2]_4{[Ni(enMe)_2][Ni(enMe)_2(H_20)AsMo~vl_4mo~v_4v~iv_80_44]_2,]_28H_20 (3), showing a 3-Dsupramolecular framework with 1-D channels, contains the first example of a molybdoarsenate dimerformed by [Ni(enMe)_2]~2+cations bridging two neighboring tetra-capped a-Keggin-based molybdatesthat support the transition metal complex [Ni(enMe)_2H_20]. The topological networks of thesupramolecular frameworks of 2 and 3 are analogous. Crystal structural analysis reveals that thedimensionality and the organization of polyoxometalate building units in the solid state can be tuned bythe steric hindrances of the polyanions. Both 2 and 3 exhibit intensive photoluminescence.
机译:合成了三种基于α-Keggin型多金属氧酸盐的超分子结构,其结构已通过元素分析,红外(IR)光谱,X射线光电子能谱(XPS)和单晶X射线衍射结构分析来表征。 [Ni(enMe)_2(H_20)_2] _2 [Ni(enMe)_2PW〜vI_9W〜v_30_40] .H_20(1)(enMe = 1,2'-丙二胺)通过两个分子之间的相互作用表现出新颖的二维超分子正弦层过渡金属配合物和一维共价链,它们是由过渡金属配合物桥接的a-Keggin单元构成的。 [Ni(enMe)_2] _4 {[Ni(enMe)_2] [Ni(enMe)_2(H_20)AsW〜vI_6W〜v_4V_40_42] _26H 0(2),6V4 IV4-42,2 j。--2-表示具有1-D通道的3-D超分子框架,包含具有由[Ni(enMe)_2]〜2 +阳离子桥和双封端a-Keggin多金属氧酸盐结构单元构建的无机-有机复合表面的钨酸盐二聚体的第一个示例[Ni(enMe)_2] _4 {[Ni(enMe)_2] [Ni(enMe)_2(H_20)AsMo〜vl_4mo〜v_4v〜iv_80_44] _2,] _ 28H_20(3),显示了3-具有一维通道的超分子框架包含第一个由[Ni(enMe)_2]〜2 +阳离子形成的钼酸砷二聚体的第一个例子,该桥将支持过渡金属配合物[Ni(enMe)的两个相邻的四封端的基于a-Keggin的钼酸盐桥接_2H_20]。 2和3的超分子框架的拓扑网络是相似的。晶体结构分析表明,固态的多金属氧酸盐结构单元的尺寸和组织可以通过聚阴离子的空间位阻进行调节。 2和3均显示出强烈的光致发光。

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