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Closed Access item The construction of open GdIII metal–organic frameworks based on methanetriacetic acid: New objects with an old ligand

Authors:Cañadillas-Delgado, Laura
Martín, Tomás
Fabelo, Oscar
Ruiz-Pérez, Catalina
Keywords:Gadolinium, Magnetic properties, Metal–organic frameworks, Topology, X-ray diffraction
Issue Date:Apr-2010
Citation:Chemistry - A European Journal 16(13): 4037-4047 (2010)
Abstract:The preparation, X-ray crystallography and magnetic investigation of the first examples of methanetriacetate (mta)-containing lanthanide(III) complexes of formulae [Gd(mta)(H2O)3]n⋅4 n H2O (1) [Gd(mta)(H2O)3]n⋅2 n H2O (2) and [Gd2(mta)2(H2O)2]n⋅2 n H2O (3) are described herein. This tripodal ligand promotes the formation of 63 networks; thus 1 consists of a honeycomb structure, whereas in 2 two of these layers are condensed to form a rare five-connected two-dimensional (4862) network. Compound 3 can be seen as an aggregation of 63 layers leading to a three-dimensional (6,6)-connected binodal (41263)(4966)-nia net, in which the gadolinium(III) ions and the mta ligands act as octahedral and as trigonal prismatic nodes, respectively. The magnetic properties of 1–3 were investigated in the temperature range 1.9–300 K. A close fit to the Curie law (1) and weak either antiferro- [J=−0.0063(1) cm−1 (2)] or ferromagnetic [J=+0.0264(6) cm−1 (3)] interactions between the GdIII ions are observed; the different exchange pathways involved [extended tris-bidentate mta (1) and μ-O(1);κ2O(1),O(2) (2 and 3) plus single syn–syn carboxylate-mta (3)] accounting for these magnetic features. The nature and magnitude of the magnetic interactions, between the GdIII ions in 1–3, agree with the small amount of data existing in the literature for these kind of bridges.
Description:11 páginas, 11 figuras, 2 esquemas.-- et al.
Publisher version (URL):http://dx.doi.org/10.1002/chem.200903053
E-ISSNmetadata.dc.identifier.doi = DOI:1521-3765
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