A magnetostructural and electrochemical study of Cu-II and Fe-III complexes containing a tetradentate aminebis(phenolate) ligand with a pendent tetrahydrofuran group

作者：Safaei Elham; Weyhermueller Thomas; Bothe Eberhard; Wieghardt Karl; Chaudhuri Phalguni^*

来源：European Journal of Inorganic Chemistry, 2007, 2007(16): 2334-2344.

DOI：10.1002/ejic.200700095

• iron
• copper
• aminebis(phenol)
• electrochemistry
• magnetism

Ligating properties of a tetradentate ligand 2-{bis[(3,5-ditert-butyl-2-hydroxybenzyl)amino]methyl}tetrahydrofuran, H2L, with [O,O,N,O]-donor atoms towards Cu-II and Fe-III are described. The ligand H2L yields both mononuclear LFeIII- (acac) (1) and dinuclear [L2Fe2III(mu-OCH3)-(mu-OH)] (2), [L2Fe2III(mu-C2O4)] (3) and [L2CuII2] (4) complexes, which were characterized by various physical techniques, including Xray diffraction, Mossbauer, electrochemical and magnetic susceptibility (2-290 K) measurements. That the electrochemical oxidations are ligand-centered, i.e. formation of phenoxyl radicals from the coordinated phenolates, have been shown by voltammetric methods. Complexes 2-4 display antiferromagnetic exchange coupling of the neighbouring metal centers. Comparison of the evaluated weak exchange coupling constants (J) with the literature values leads to the conclusion that the angle Cu-O-Cu' is not the only determinant for the nature of the exchange coupling and the capability of the bridging ligands as mediators for spin coupling in case of Fe-III follows the order phenoxide approximate to methoxide > hydroxide.

• 出版日期2007-6