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首页> 外文期刊>Zeitschrift fur Anorganische und Allgemeine Chemie >A first and homoleptic rare earth 3D-bipyrazolate MOF:~3_∞[Eu(Me_4BpZH)_3(Me_4BpZH _2)]
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A first and homoleptic rare earth 3D-bipyrazolate MOF:~3_∞[Eu(Me_4BpZH)_3(Me_4BpZH _2)]

机译:第一均质稀土3D-联吡唑酸酯MOF:〜3_∞[Eu(Me_4BpZH)_3(Me_4BpZH _2)]

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摘要

The homoleptic framework ~3_∞[Eu(Me _4BpzH)_3(Me_4BpzH_2)], Me _4BpzH~- = 3,3′,5,5′-tetramethyl-4,4′- bipyrazolate anion, C_(10)H_(13)N_4~-, Me_4BpZH_2 = 3,3′,5,5′-tetramethyl-4,4′- bipyrazole, C_(10)H_(14)N_4, is obtained by a high-temperature oxidation of the metal europium with a self consuming melt of 3,3′,5,5′-tetramethyl-4,4′-bipyrazole above 300°C. The framework structure initiates from a three-dimensional linkage of europium atoms and bridging ligands that coordinate with one nitrogen atom of each aromatic ring linking η_1:η_1 through front and backside of the bicyclic ring system. The framework has a (4,8) topology and is the first example of a rare earth bipyrazolate. Thus, for the trivalent eightfold by nitrogen atoms coordinated europium, a sterically rather crowded ligand with four methyl groups is able to yield a 3D-framework. The crystal structure was refined from systematically eightfold twinned crystals as meroedric fourfold twins with a subsequent racemic twinning of the fourfold twin individuals.
机译:均相构架〜3_∞[Eu(Me _4BpzH)_3(Me_4BpzH_2)],Me _4BpzH〜-= 3,3',5,5'-四甲基-4,4'-联吡唑酸酯,C_(10)H_(13 )N_4〜-,Me_4BpZH_2 = 3,3',5,5'-四甲基-4,4'-联吡唑,C_(10)H_(14)N_4通过金属a的高温氧化得到高于300°C的3,3',5,5'-四甲基-4,4'-联吡唑的自耗熔体。框架结构从of原子和桥接配体的三维连接开始,这些配体与通过双环系统的正面和背面连接η_1:η_1的每个芳香环的一个氮原子配位。该框架具有(4,8)拓扑,是稀土联吡唑酸盐的第一个示例。因此,对于由氮原子配成的三价三价euro原子,具有四个甲基的空间相当拥挤的配体能够产生3D框架。晶体结构从系统的八重孪生晶体(如铁四重孪晶)和随后的四重孪生个体的外消旋孪晶中精制而成。

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