| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1312528 | Inorganica Chimica Acta | 2011 | 6 Pages |
A series of carboxylate-bridged manganese(III) complexes derived from Schiff bases obtained by the condensation of salicylaldehyde or 5-bromo-salicylaldehyde and different types of diamine have been synthesized and characterized and, in the case of [Mn2(L1)2(μ-ClCH2COO)](ClO4) (1), the structure has been obtained by X-ray crystallography. The structure of 1 consists of two manganese atoms separated by 5.487(3) Å and bridged by a carboxylate anion. This dinuclear structural unit is linked by bridging phenoxy oxygens to adjacent dinuclear units to produce a one-dimensional chain. Cyclic voltammograms of all the compounds exhibit grossly similar features consisting of a reversible or quasi-reversible MnIII/MnII reduction and a MnIII/MnIV oxidation. It has been observed that bromo-substitution stabilizes the lower oxidation state in the MnIII/MnII couple and destabilizes the higher oxidation state in the MnIII/MnIV couple. Variable temperature magnetic susceptibility measurements of 1 show a weak antiferromagnetic interaction. The magnetic behavior is satisfactorily modeled by inclusion of zero-field splitting and an intermolecular interaction component.
Graphical abstractA series of carboxylate-bridged manganese(III) complexes derived from Schiff bases obtained by the condensation of salicylaldehyde or 5-bromo-salicylaldehyde and different types of diamine have been synthesized and characterized and, in the case of [Mn2(L1)2(μ-ClCH2COO)](ClO4) (1), the structure and the variable temperature magnetic susceptibility measurements has been obtained.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Carboxylate-bridged Mn2(III) complexes by condensation of aldehydes and diamines. ► Structure of one complex has been obtained by X-ray crystallography. ► Dinuclear structural unit is linked by bridging phenoxy oxygens to adjacent units. ► Cyclic voltammograms exhibit MnIII/MnII reduction and a MnIII/MnIV oxidation. ► Magnetic susceptibility measurements show a weak antiferromagnetic interaction.
