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Structural, MALDI-TOF-MS, magnetic and spectroscopic studies of new dinuclear copper(II), cobalt(II) and zinc(II) complexes containing a biomimicking μ-OH bridge.
MedLine Citation:
PMID:  21052599     Owner:  NLM     Status:  In-Process    
Abstract/OtherAbstract:
The Py(2)N(4)S(2) octadentate coordinating ligand afforded dinuclear cobalt, copper and zinc complexes and the corresponding mixed metal compounds. The overall geometry and bonding modes have been deduced on the basis of elemental analysis data, MALDI-TOF-MS, IR, UV-vis and EPR spectroscopies, single-crystal X-Ray diffraction, conductivity and magnetic susceptibility measurements. In the copper and zinc complexes, a μ-hydroxo bridge links the two metal ions. In both cases, the coordination geometry is distorted octahedral. Magnetic and EPR data reveal weakly antiferromagnetic high spin Co(II) ions, compatible with a dinuclear structure. The magnetic characterization of the dinuclear Cu(II) compound indicates a ferromagnetically coupled dimer with weak antiferromagnetic intermolecular interactions. The intra-dimer ferromagnetic behaviour was unexpected for a Cu(II) dimer with such μ-hydroxo bridging topology. We discuss the influence on the magnetic properties of non-covalent interactions between the bridging moiety and the lattice free water molecules.
Authors:
Cristina Núñez; Rufina Bastida; Alejandro Macías; Laura Valencia; Nicolás I Neuman; Alberto C Rizzi; Carlos D Brondino; Pablo J González; José Luis Capelo; Carlos Lodeiro
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2010-11-04
Journal Detail:
Title:  Dalton transactions (Cambridge, England : 2003)     Volume:  39     ISSN:  1477-9234     ISO Abbreviation:  Dalton Trans     Publication Date:  2010 Dec 
Date Detail:
Created Date:  2010-11-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101176026     Medline TA:  Dalton Trans     Country:  England    
Other Details:
Languages:  eng     Pagination:  11654-63     Citation Subset:  IM    
Affiliation:
Departamento de Química Inorgánica, Facultade de Química, Universidade de Santiago de Compostela, 15782, Santiago de Compostela, España.
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