Varying the metal/metal ratio in related Cu–Ca complexes

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• 作者：Fatima Zohra Chiboub Fellah ; Jean-Pierre Costes ; Franç ; oise Dahan ; Carine Duhayon ; Jean-Pierre Tuchagues
• 关键词：Compartmental Schiff base ligands ; 3d-Alkaline-earth heterometallic complexes ; Dinuclear Cu– ; Ca complexes ; Trinuclear Cu– ; Ca– ; Cu complexes ; Single-crystal X-ray structures ; Magnetic properties
• 刊名：Polyhedron
• 出版年：2007
• 期刊代码：87_02775387
• 类别：ch
• 出版时间：20 September 2007
• 卷：26
• 期：15
• 页码：4209-4215
• 文件大小：465 K

摘要

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.