Di- and Triheteronuclear Cu−Gd and Cu−Gd−Cu Complexes with Dissymmetric Double Bridge

Citations Over TimeTop 14% of 2008 papers

Abstract

The study of the Cu-Gd interaction is simplified by the use of heteronuclear Cu-Gd complexes of low nuclearity, such as dinuclear Cu-Gd or trinuclear Cu-Gd-Cu complexes. In the large majority of cases published until now, this interaction presents the advantage of being ferromagnetic. Among the known examples, the complexes with the largest J values have been prepared with use of symmetric Schiff base compartmental ligands, so that the active cores of the molecules involve two phenoxo bridges between the copper and gadolinium ions. Keeping this remark in mind, we decided to synthesize simple complexes in which two different bridges link the copper and gadolinium ions. The structural determinations of a heterodinuclear Cu-Gd and a trinuclear Cu-Gd-Cu complex confirm the asymmetry of the central cores, involving phenoxo and hydroxo bridges. The magnetic studies evidence again the presence of ferromagnetic interactions. These results corroborate preponderance of the planarity of the Cu-O2-Gd core over the dissymmetry of the bridges.

Related Papers

• → Qualitative and quantitative exploitation of heteronuclear coupling constants(2002)28 cited
• → [5] Heteronuclear nuclear magnetic resonance experiments for studies of protein conformation(1989)24 cited
• → Determination of heteronuclear three-bond J-coupling constants in peptides by a simple heteronuclear relayed E.COSY experiment(1995)18 cited
• → Homonuclear and Heteronuclear Cluster Compounds of Gold(1999)13 cited