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首页> 外文期刊>Inorganic Chemistry Communications >Synthesis, structure and magnetism of a 2-D organic-inorganic hybrid tetra-Co~(II)-substituted sandwich-type Keggin germanotungstate: {[Co(dap)2(H2O)]2 [Co(dap)2]2[Co4(Hdap)2(B-α-HGeW9O_(34))2]}·7H2O
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Synthesis, structure and magnetism of a 2-D organic-inorganic hybrid tetra-Co~(II)-substituted sandwich-type Keggin germanotungstate: {[Co(dap)2(H2O)]2 [Co(dap)2]2[Co4(Hdap)2(B-α-HGeW9O_(34))2]}·7H2O

机译：二维有机-无机杂化四-Co​​〜（II）-取代的夹心型Keggin锗钨酸盐的合成，结构和磁性：{[Co（dap）2（H2O）] 2 [Co（dap）2] 2 [ Co4（Hdap）2（B-α-HGeW9O_（34））2]}·7H2O

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摘要

A novel 2-D organic-inorganic hybrid tetra-Co~(II)-substituted sandwich-type Keggin germanotungstate {[Co (dap)2(H2O)]2[Co(dap)2]2[Co4(Hdap)2(B-α-HGeW9O_(34))2]}·7H2O (1) (dap = 1,2-diaminopropane) has been hydrothermally synthesized and structurally characterized by elemental analyses, IR spectrum, UV spectrum, powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA) and single-crystal X-ray diffraction. Structural analysis shows that 1 displays a rare 2-D (4,4)-topological network constructed by tetra-Co~(II)-substituted sandwich-type Keggin germanotungstate units and [Co(dap)2]~(2+) bridges. To our knowledge, 1 represents the first 2-D organic-inorganic hybrid cobalt-substituted sandwich-type polyoxotungstate. Magnetic preperties of 1 have been investigated. The decrease of the product of the molar magnetic susceptibility at higher temperatures results from the spin-orbit coupling of the Co~(II) ion and/or the antiferromagnetic interactions whereas the maximum at the lower temperatures is indicative of the ferromagnetic interactions within the tetranuclear Co~(II) spin cluster in the sandwich belt.
机译：新型的2-D有机-无机杂化四-Co​​〜（II）取代的三明治型Keggin锗钨酸盐{[Co（dap）2（H2O）] 2 [Co（dap）2] 2 [Co4（Hdap）2（ B-α-HGeW9O_（34）2]}·7H2O（1）（dap = 1,2-二氨基丙烷）已水热合成，并通过元素分析，红外光谱，紫外光谱，粉末X射线衍射（PXRD）对其结构进行了表征），热重分析（TGA）和单晶X射线衍射。结构分析表明1显示了一个稀有的2-D（4,4）-拓扑网络，该网络由四-Co〜（II）-取代的三明治型Keggin锗钨酸盐单元和[Co（dap）2]〜（2+）桥构成。据我们所知，1代表第一个2-D有机-无机杂化钴取代的三明治型多氧钨酸盐。已经研究了1的磁性。较高温度下摩尔磁化率乘积的降低是由Co〜（II）离子的自旋轨道耦合和/或反铁磁相互作用引起的，而在较低温度下的最大值表明了四核内的铁磁相互作用夹心带中的Co〜（II）自旋簇。

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