Dinuclear triple helical Mn(III), Fe(III) and Co(III) complexes

Synthesis, characterization and physical properties of the dinuclear triple helical complexes [Mn2(μ-L)3] (1), [Fe2(μ-L)3] (2) and [Co2(μ-L)3] (3) with the tetradentate Schiff base (H2L) derived from 1 mol equiv. of hydrazine and 2 mole equiv. of 2-hydroxy-1-naphthaldehyde are described. Triple helical molecular structures of 2 and 3 have been confirmed by X-ray crystallography. Magnetic susceptibility measurements reveal complex 3 is diamagnetic while a weak antiferromagnetic interaction is operative between the metal centres in both 1 and 2.

Graphical abstractSynthesis and characterization of dinuclear triple helical complexes of general formula [M2(μ-L)3] (M = Mn, Fe and Co) with a diazine ligand (L2−) are described. X-ray structures of the diiron(III) and the dicobalt(III) complexes are determined. Cryomagnetic data reveal a weak antiferromagnetic interaction between the metal centres in both dimanganese(III) and diiron(III) complexes.Figure optionsDownload full-size imageDownload as PowerPoint slide