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首页> 外文期刊>Crystal growth & design >Divalent manganese linked tungsten-molybdenum polyoxometalates: Synthesis, structure, and magnetic characteristics
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Divalent manganese linked tungsten-molybdenum polyoxometalates: Synthesis, structure, and magnetic characteristics

机译:二价锰连接的钨钼多金属氧酸盐:合成,结构与磁性

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摘要

Three novel tungsten-molybdenum polyoxometalate compounds, namely H2.5K2[Mn-1.,5W5.65Mo1.35O24(H2O)4]Cl-1.5 degrees 6H(2)O (1), H5K2Na[Mn-2(H2O)(6)(H2W9.52Mo2.48O42)]Cl-2 center dot 20H(2)O (2), and Na-2[Mn-4(H2O)(14)(H2W12O42)]center dot 16H(2)O (3), were prepared and characterized by elemental analysis and IR spectroscopy. Single-crystal X-ray diffraction analyses reveal their three-dimensional network composed of a framework Of M7O246- or H2M12O4210- (M = W or W/Mo) linked via divalent manganese cations Mn(H2 O)(n)(2+) (n = 2-4), with the help of potassium for 1 and 2. Magnetic measurements reveal that all the three compounds 1-3 show paramagnetic properties with a magnetic moment about the single Mn2+ cation, indicating very weak anti ferromagnetic coupling between the neighboring Mn2+ cations in these three-dimensional architectures.
机译:三种新颖的钨钼多金属氧酸盐化合物,即H2.5K2 [Mn-1。,5W5.65Mo1.35O24(H2O)4] Cl-1.5度6H(2)O(1),H5K2Na [Mn-2(H2O)( 6)(H2W9.52Mo2.48O42)] Cl-2中心点20H(2)O(2)和Na-2 [Mn-4(H2O)(14)(H2W12O42)]中心点16H(2)O( 3),通过元素分析和红外光谱进行制备和表征。单晶X射线衍射分析揭示了它们的三维网络,该网络由通过二价锰阳离子Mn(H2 O)(n)(2+)连接的M7O246-或H2M12O4210-(M = W或W / Mo)框架组成(n = 2-4),在钾的帮助下为1和2。磁性测量表明,所有三种化合物1-3均表现出顺磁性,并且具有围绕单个Mn2 +阳离子的磁矩,这表明金属间存在非常弱的反铁磁耦合。这些三维结构中的相邻Mn2 +阳离子。

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