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|Title:||Metal-Organic Frameworks Assembled From Erbium Tetramers and 2,5-Pyridinedicarboxylic Acid|
Silva, Nuno J. O.
Almeida Paz, Filipe A.
|Keywords:||LANTHANIDE COORDINATION POLYMERS|
CAMBRIDGE STRUCTURAL DATABASE
HIGH PROTON CONDUCTIVITY
|Publisher:||AMER CHEMICAL SOC|
|Abstract:||Two novel three-dimensional lanthanide-organic frameworks, [Er-6(OH)(8)(pydc)(5)(H2O)(3)]center dot 2.5H(2)O (1) and [Er-3(OH)(6)(pydc)Cl] (2) (pydc(2-) is the deprotonated residue of 2,5-pyridinedicarboxylic acid - 2,5-H(2)pydc), were prepared by hydrothermal synthesis 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 results from the coalescence if cubane-type clusters of Er3+. Compound 2 comprises densely packed cationic [Er-3(OH)(6)Cl](n)(2n+) 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  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-organic 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.|
|Appears in Collections:||CICECO - Artigos|
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|Metal–Organic Frameworks Assembled From Erbium Tetramers and 25-Pyridinedicarboxylic Acid_10.1021cg400369a.pdf||3.02 MB||Adobe PDF|
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