Showing papers by "Catherine Belle published in 1997"
TL;DR: In this article, the site-directed complexation with the same dinucleating ligand H3L has been demonstrated and the crystal structure reveals that the copper and iron atoms are bridged by the central phenoxo moiety and by an exogenous ethoxo group.
Abstract: Mononuclear copper(II) [Cu(H3L)(O2CMe)]BPh41 and heterodinuclear copper(II)–iron(III) [FeCuL(µOEt)]ClO42 complexes from the same dinucleating ligand H3L have been prepared and isolated {H3L = 2-[bis(2-hydroxybenzyl)aminomethyl]-4-methyl-6-[bis(2-pyridylmethyl)aminomethyl]phenol}. The crystal structure of the mononuclear complex 1 demonstrated the site-directed complexation with H3L. For the heterodinuclear complex 2 the crystal structure reveals that the copper and iron atoms are bridged by the central phenoxo moiety and by an exogenous ethoxo group. In addition this structure showed that the iron atom is five-co-ordinated. Temperature-dependent magnetic susceptibility measurements revealed an antiferromagnetic interaction (ca.J = –58.1 cm–1) between the copper and iron atoms in 2. Cyclic voltammograms in dichloromethane vs. Ag–AgNO3 revealed a quasi-reversible redox behaviour for CuII–CuI in 1 and 2 (E½ = –0.77 and –0.74 V respectively). The reduction of FeIII in 2 is irreversible with Epc = –1.69 V. The CuIFeIII complex is thermodynamically stable towards comproportionation.
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