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Varying the metal/metal ratio in related Cu–Ca complexes |
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| Authors: | Fatima Zohra Chiboub Fellah Jean-Pierre Costes Françoise Dahan Carine Duhayon Jean-Pierre Tuchagues |
| Institution: | 1. Laboratoire de Chimie de Coordination du CNRS, UPR 8241, liée par conventions à l’Université Paul Sabatier et à l’Institut National Polytechnique de Toulouse, 205 route de Narbonne, 31077 Toulouse Cedex, France;2. Université Abou baker Belkaid, Faculté des Sciences, Département de Chimie, BP 119, 13000 Tlemcen, Algeria |
| Abstract: | We demonstrate with the help of structural determinations and spectroscopic data that the nuclearity of Cu–Ca complexes derived from compartmental Schiff base ligands does not depend on the ionic radius of calcium. The main factors governing these reactions are the different affinities of the calcium ions for the anionic species present in solution: the tetradentate O2O2 coordination site of the ligand and the nitrato ions. Because these affinities do vary upon going from calcium to lanthanide ions, it is not possible to use the template effect of the trinuclear Cu–Ca–Cu complexes in order to prepare the corresponding Cu–Ln–Cu complexes. |
| Keywords: | Compartmental Schiff base ligands 3d-Alkaline-earth heterometallic complexes Dinuclear Cu&ndash Ca complexes Trinuclear Cu&ndash Ca&ndash Cu complexes Single-crystal X-ray structures Magnetic properties |
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