Ferromagnetic exchange in a dinuclear copper(II) complex mediated by a methanolate bridging ligand.
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-bis[4-(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.
Fondo
Matilde
M
Departamento de Química Inorgánica, Facultade de Ciencias, Universidade de Santiago de Compostela, E-27002, Lugo, Spain.
García-Deibe
Ana M
AM
Corbella
Montserrat
M
Ribas
Joan
J
Llamas-Saiz
Antonio
A
Bermejo
Manuel R
MR
Sanmartin
Jesús
J