Metal鈥揙rganic Frameworks Assembled From Erbium Tetramers and 2,5-Pyridinedicarboxylic Acid
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- 作者：Patr铆cia Silva ; Lu铆s Cunha-Silva ; Nuno J. O. Silva ; Jo茫o Rocha ; Filipe A. Almeida Paz
- 刊名：Crystal Growth & Design
- 出版年：2013
- 出版时间：June 5, 2013
- 年：2013
- 卷：13
- 期：6
- 页码：2607-2617
- 全文大小：980K
- 年卷期：v.13,no.6(June 5, 2013)
- ISSN：1528-7505
文摘
Two novel three-dimensional lanthanide-organic frameworks, [Er6(OH)8(pydc)5(H2O)3]路2.5H2O (1) and [Er3(OH)6(pydc)Cl] (2) (pydc2鈥?/sup> is the deprotonated residue of 2,5-pyridinedicarboxylic acid - 2,5-H2pydc), were prepared by hydrothermal synthesis. Compound 1 consists of an unique one-dimensional (1D) cationic [Er6(OH)8(H2O)3]n10n+ inorganic chain embedded into an organic matrix formed by the linker. Individual chains are disposed in the ab plane of the unit cell in a brick-wall fashion and result from the coalescence of cubane-type clusters of Er3+. Compound 2 comprises densely packed cationic [Er3(OH)6Cl]n2n+ inorganic layers, constructed by the lateral coalescence of 1D chains identical to those found in 1. These layers are pillared by the organic linkers along the [001] direction of the unit cell yielding the crystal structure of 2. Considering the metallic tetramers and the ligands as framework nodes, compounds 1 and 2 are 7- and 2-nodal networks, respectively. While the former is unprecedented among metal鈥搊rganic framework (MOF) structures, the latter is reminiscent of the known tcj/hc topological type. The crystal structures and properties of the two compounds have been investigated by (single-crystal and powder) X-ray diffraction, electron microscopy (SEM and EDX), vibrational spectroscopy, CHN elemental analyses, and thermogravimetry. The magnetic properties of 1 also have been investigated.
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