Ferromagnetic exchange in a dinuclear copper(II) complex mediated by a methanolate bridging ligand |
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Authors: | Fondo Matilde García-Deibe Ana M Corbella Montserrat Ribas Joan Llamas-Saiz Antonio Bermejo Manuel R Sanmartin Jesús |
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Institution: | Departamento de Química Inorgánica, Facultade de Ciencias, Universidade de Santiago de Compostela, E-27002, Lugo, Spain. |
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Abstract: | The copper(II) complex Cu(2)L(OMe)(H(2)O)(3), middle dot]3H(2)O H(3)L = 2-(2-hydroxyphenyl)-1,3-bis4-(2-hydroxyphenyl)-3-azabut-3-enyl]-1,3-imidazolidine] was obtained and recrystallised in methanol to yield crystals of Cu(2)L(OMe)]](2).2.5MeOH.4H(2)O, 1.2.5MeOH.4H(2)O. Its single X-ray study shows that it contains two crystallographically different but chemically equivalent dinuclear Cu(2)L(OMe)] 1 molecules in the asymmetric unit cell. The copper atoms of each dinuclear moiety are in distorted square-pyramidal environments, with both pyramids sharing an apical phenolate and a basal methanolate oxygen atom. Magnetic characterisation of 1.3H(2)O shows a quite strong intramolecular ferromagnetic coupling between both metal atoms. Extended Huckel calculations reveal that the intradinuclear magnetic interaction seems to be mediated by the exogenous methanolate bridging ligand. |
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