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Cyclic Water Hexamers and Decamers in a Porous Lanthanide-Organic Framework: Correlation between Some Physical Properties and Crysal Structure

机译:多孔镧系元素-有机骨架中的循环水六聚体和除垢剂:一些物理性质与晶体结构之间的相关性

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摘要

Erbium fumarate [Er_2(fum)_3(H_2O)_4]·8H_2O, 1, (fum = fumarate dianion) crystallizes at room temperature in a silica gel column. The structure is three-dimensional and consists of layers of erbium fumarate pillared by fumarate dianions acting in the bis-chelating mode. The layers contain arrays of erbium cations bridged by fumarate dianions acting in the bis-bidentate bridging mode. The relatively large channels formed in the direction of the a and c axes are filled by water molecules that form a hydrogen bonded layer, comprising cyclic hexamers with both boat and chair conformations and cyclic decamers with boat-chair-boat conformation. The water molecules are reversibly removed at 90 ℃. The evacuated metal-organic framework, 2, is stable up to 400 ℃. Both compounds 1 and 2 exhibit weak antiferromagnetic interactions.
机译:富马酸[[Er_2(fum)_3(H_2O)_4]·8H_2O,1(fum =富马酸二价阴离子)在硅胶柱中于室温结晶。该结构是三维结构,由富马酸二layers层组成,富马酸二by层由富马酸二价阴离子以双螯合模式作用。这些层包含由双双键桥接模式作用的富马酸二价阴离子桥接的array阳离子阵列。沿a轴和c轴方向形成的相对较大的通道被形成氢键层的水分子填充,该氢键层包括具有船和椅结构的环状六聚体和具有船-椅-船结构的环状十聚体。在90℃时可逆地除去水分子。排空的金属有机框架2在高达400℃的温度下稳定。化合物1和2均显示弱的反铁磁相互作用。

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