Preparative and Magnetic Studies of Several Binuclear Copper(II) Alkanoate Complexes with Salicylideneamines

Compounds with the stoichiometry of Cu(5-R″-sal·N–R)R′COO (5-R″-sal·N–=·\overset2O·C6H3(\overset5R″)·\overset1CH=N–; R= methyl, phenyl, o-tolyl and p-tolyl; R′=ethyl, monochloromethyl and dichloromethyl; R″=H, CH3 and Cl) have been prepared, and their magnetic and spectral properties have been studied. The magnetic and IR spectral data of the compounds where R=methyl and o-tolyl, R′=dichloromethyl, and R″=H indicate that they have phenolic oxygen-bridged dimer units in their crystals. On the other hand, a carboxylate-bridged binuclear structure is postulated for the other complexes on the basis of magnetic and IR spectral data. It has been observed that, in the latter group of complexes, both the −2J(singlet-triplet separation) and νmax (ligand-field transition energy) values decrease in the order of Cu(Sal·N–R)C2H5COO>Cu(Sal·N–R)ClCH2COO>Cu(Sal·N–R)Cl2CHCOO, where Sal·N–=·\overset2O·C6H4·\overset1CH=N–. The preparation and characterization of the Cu(Sal·N–R)HCOO·DMF compounds (R=p-tolyl and p-chloropheny...

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