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Organocyanide coordination chemistry: Syntheses, structural characterisations and magnetic properties of copper (II) complexes with a di-imine/pyridine ligand |
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| Authors: | Beno?ˆt Le Gall Nathalie Cosquer Jean Sala-Pala Estelle Vigier Philippe Molinié |
| Institution: | a Laboratoire de Chimie, Electrochimie Moléculaires et Chimie Analytique, UMR CNRS 6521, Université de Bretagne Occidentale, 6 Avenue le Gorgeu CS 93837, 29238 Brest Cedex 3, France b Laboratoire de Synthèse et d’Electrosynthèse Organométalliques, UMR CNRS 5632, Université de Bourgogne, 21000 Dijon, France c Instituto de Ciencia Molecular (ICMol), Université de Valencia, C/Dr. Moliner 50, 46100 Burjasot (Valencia), Spain d Institut des Matériaux, UMR CNRS 6502, 2 rue de la Houssinière, BP 32229, 44322 Nantes Cedex 03, France |
| Abstract: | The reactions between the copper (II) salts CuXL]PF6 (L: 2,6-1-(2,6-diisopropylphenylimino)ethyl]pyridine) (X = Cl 1, X = Br 2) and LiTCNQ, in a DMF/water mixture, or Et3NH(TCNQ)2, in acetone, produced the new complexes CuXL(TCNQ)] (X = Cl 3, X = Br 4). For both compounds, crystallographic studies have clearly evidenced the existence of dimeric complexes {CuClL}(TCNQ)]2 owing to π-π overlap between two adjacent TCNQ − radical anions. Compound 1 reacted with Et4N(C10N7) to afford the mononuclear derivative CuClL(C10N7)] (5), while its reaction with K2C10N6 produced the dinuclear complex (CuClL)2(C10N6)] (6). The crystal structures of complexes 5 and 6 have been determined by X-ray crystallography. Magnetic studies have revealed that compound 6 displays weak antiferromagnetic interactions between the two metal centres, conversely compounds 3 and 5 exhibit purely paramagnetic behaviours. |
| Keywords: | Polynitrile ligands Copper (II) Di-imine pyridine ligand Crystal structures |
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