HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

No abstract

The crystal structure of a new symmetrical pentadentate N 2 O 3 Schiff base: di[4-(phenylimino)pentan-2-one] ether (H 2 L) is described. In the solid state, the ligand appears as a keto-imine tautomer, while in DMSO solution, the eneamine form is observed. This ligand coordinates cobalt(II), nickel(II), copper(II) and cadmium(II). The structures of these new complexes are described using infrared and electronic spectroscopy, 1 H-n.m.r. and d.s.c. The cyclic voltammograms of the ligand and the complexes in DMF are discussed.

HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

We have prepared and characterised a new series of metal complexes obtained from 4,4¢-bis(salicylideneimino)diphenylethane (saldipH 2 ) and cobalt(II), copper(II) and cadmium(II) chlorides. In every case, the coordinating atoms are N and O. However, each compound has its own structure: [Co(saldip)] AE 2 H 2 O is monomeric and a mononuclear species, [Cu 2 (saldip) 2 (H 2 O)] is a binuclear complex and finally the cadmium complex is formulated as: [(CdCl 2 ) 2 (saldipH 2 )] AE CdCl 2 . An electrochemical study (cyclic voltammetry) indicates that the reduction, as well as the oxidation, of copper in [Cu 2 (saldip) 2 (H 2 O)] proceeds in two steps. For the reduction of the two other complexes, two steps are indicated out: the first is attributed to the reduction of the metal and the second to the reduction of the coordinated ligands.