Santa Cruz de Tenerife, Spain
Santa Cruz de Tenerife, Spain

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Aguirrechu-Comeron A.,University of La Laguna | Pasan J.,Laboratorio Of Rayos X Y Materiales Moleculares | Gonzalez-Platas J.,University of La Laguna | Ferrando-Soria J.,Texas A&M University | And 2 more authors.
Journal of Structural Chemistry | Year: 2015

The preparation of four new copper(II) complexes with different N-donor ligands [CuBr2(2-benzylpyridine)2] (1), [CuBr2(2-benzylpyridine)(2,2′-bipyridine)]·H2O (2), [CuBr2(3-methyl-2-phenylpiridine)2] (3), [Cu(picolinate)2]·KI (4) from copper(I) halides as starting material is described. During the preparation of compound 4 a ligand oxidation reaction took place to give the picolinate ligand starting from 2-(2-methylaminoethyl)pyridine. The complexes were characterized by elemental analyses, IR spectroscopy and crystallographic studies. Single crystal X-ray diffraction analysis of the complexes reveals their monomeric penta- and tetracoordinated nature. For all compounds, the copper(II) present a common square planar coordination except for compound 2 which is five coordinated in a quasi-square pyramidal configuration with τ of 0.29. The Cu-N distances for these compounds are in the range of 1.959(4)-2.041(3) Å, Cu-O distance was 1.961(3) Å and Cu-Br distances were in the range of 2.4052(4)-2.4381(6) Å for the square base configuration while for apical distance it was 2.6745(7) Å. Magnetic properties have been investigated for all compounds in the temperature range 2-300 K. Compound 1 shows weak antiferromagnetic intermolecular interaction. © 2015 Pleiades Publishing, Ltd.

Canadillas-Delgado L.,Centro Universitario Of La Defensa Of Zaragoza | Canadillas-Delgado L.,University of Zaragoza | Fabelo O.,University of Zaragoza | Fabelo O.,Laue Langevin Institute | And 6 more authors.
Acta Crystallographica Section B: Structural Science, Crystal Engineering and Materials | Year: 2014

Three new metal-organic framework structures containing EuIII and the little explored methanetriacetate (C7H7O6 3-, mta 3-) ligand have been synthesized. Gel synthesis yields a two-dimensional framework with the formula [Eu(mta)(H2O)3] n ·2nH2O, (I), while two polymorphs of the three-dimensional framework material [Eu(mta)(H2O)] n ·nH2O, (II) and (III), are obtained through hydrothermal synthesis at either 423 or 443 K. Compounds (I) and (II) are isomorphous with previously reported GdIII compounds, but compound (III) constitutes a new phase. Compound (I) can be described in terms of dinuclear [Eu2(H2O)4]6+ units bonded through mta3- ligands to form a two-dimensional framework with topology corresponding to a (6,3)-connected binodal (4 3)(466683)-kgd net, where the dinuclear [Eu2(H2O)4]6+ units are considered as a single node. Compounds (II) and (III) have distinct three-dimensional topologies, namely a (41263)(4966)-nia net for (II) and a (41065)(41164)-K2O2; 36641 net for (III). The crystal density of (III) is greater than that of (II), consistent with the increase of temperature, and thereby autogeneous pressure, in the hydrothermal synthesis. © 2014 International Union of Crystallography.

Canadillas-Delgado L.,Laboratorio Of Rayos X Y Materiales Moleculares | Fabelo O.,Laboratorio Of Rayos X Y Materiales Moleculares | Pasan J.,Laboratorio Of Rayos X Y Materiales Moleculares | Julve M.,University of Valencia | And 2 more authors.
Polyhedron | Year: 2010

The first gadolinium(III) complexes with the trideprotonated form of the 1,2,3,4,5,6-cyclohexanehexacarboxylic acid (H3clhex3-) of formulae [Gd(H3clhex)(H2O)4]n·3nH2O (1) and [Gd(H3clhex)(H2O)4]n·6nH2O (2) have been prepared through the gel technique and their structures determined by single crystal X-ray diffraction. The structure of 1 is made up of 63 honey-comb layers which are generated by [Gd(H2O)4]3+ cations and H3clhex3- anions acting as three-fold nodes and three-fold connectors, respectively. The structure of 2 consists of a [44,62] two-dimensional network extended in the ac plane where the H3clhex-3 groups act as four-fold connectors and the [Gd(H2O)4]3+ units as four-fold nodes. Compound 1 crystallises in a non-centrosymmetric space group P21. Its absolute structure could be determined reliably, indicating the spontaneous resolution of a homochiral crystal and the freezing of one of the conformations of the all-cis H3clhex-3 ligand. Compound 2 crystallises in the P21/n space group, the presence of an inversion centre making both conformations to occur. 1 and 2 are different solvates of the same system, the latter one synthesised under a higher pH value of the gel than the former. The investigation of the magnetic properties of 1 and 2 in the temperature range 1.9-300 K reveals a Curie law behaviour for the two compounds. © 2009 Elsevier Ltd. All rights reserved.

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