Microporous Rare Earth Coordination Polymers: Effect of Lanthanide Contraction on Crystal Architecture and Porosity
Source abstract
Abstract
A series of microporous coordination polymers of adipic (H 2 ad) and pimelic acids (H 2 pim) with rare earth metals have been synthesized and structurally characterized. In the case of adipic acid, two distinct structure types were isolated: structure type I with formula [Ln 2 (ad) 3 (H 2 O) 4 ]6H 2 O, Ln = Ce 3+, Pr 3+, Nd 3+, and strucure type II with formula [Ln 2 (ad) 3 (H 2 O) 4 ] x H 2 O, Ln = Nd 3+, Sm 3+, Gd 3+, Er 3+, Yb 3+ . Type I compounds are isostructural to lanthanum adipate ( Inorg. Chem . 1998, 37, 3407) and contain interconnected channels filled with hydrogen-bonded water molecules. The structure of type II polymers consists of interpenetrated (4,4) metal−organic networks. Channels along one crystallographic direction are created by the interpenetration. The minimum width of the channels depends on the nature of the metal incorporated in the framework. The passage from type I to type II structure is ascribed to the well-known effect of lanthanide contraction. In the case of H 2 pim, one compound of formula [La(pim)(Hpim)(H 2 O)]H 2 O was isolated. Channels, filled with water molecules, are formed along one crystallographic direction. In all compounds, the water molecules can be reversibly removed.
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Research context
OpenAlex topics: Metal-Organic Frameworks: Synthesis and Applications · Lanthanide and Transition Metal Complexes · Covalent Organic Framework Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece, Laboratoire de Chimie du Solide Inorganique et Moleculaire UMR 6511, Institut de Chimie de Rennes, Universite de Rennes I, Campus de Beaulieu, 35042 Rennes Cedex, France, and Laboratoire de Cristallographie et Modelisation des Materiaux Mineraux et Biologiques (LCM3B), Universite Henri Poincare Nancy I, ESA 7036, BP 239, 54506 Vandoeuvre les Nancy Cedex, France
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