Probing the structural features and magnetic behaviors in dinuclear cobalt (II) and trinuclear iron(III) complexes

The coordination chemistry of the tetradentate N2O2-type ligand 2-[Bis(2-hydroxybenzyl)aminomethyl]pyridine (H2L) has been investigated with cobalt(II) and iron (III) ions. Synthesis, structure and detailed magnetic study of dinuclear Co(II) and trinuclear iron(III) complexes were reported. The complexes: [Co-2(L)(2)] (1), [Fe-3(mu(3)- O)(mu(2)-OH)(L)(3)].2.5CH(3)CN (2) and [Fe-3(mu(3)-O)(mu(2)-OH)(L)(3)].2DMA. Et2O (3) have been structurally analyzed by single-crystal X-ray diffraction. In Co(II) complex two Co(II) centres are bridged by a phenoxo group whereas in Fe(III) complexes, three metal centres are connected through mu(2)-phenoxo, mu(2)-hydroxo and mu(3)-oxo bridges. Analysis of the temperature dependent magnetic susceptibility of compound 1 indicates that the phenoxo, hydroxo and oxo bridge mediate weak antiferromagnetic interactions with a coupling constant J(Co-Co) = -0.89 cm(-1). The magnetic study of trinuclear Fe(III) complex (compound 2) displays intra-metallic ferro-and antiferromagnetic exchange interactions through oxo, phenoxo and hydroxo bridges. Fitting to the curve revealed the parameters, J(1) = 2.45 cm(-1), J(2) = -0.65 cm(-1) and g = 1.95.

Automated summary

The coordination chemistry of a tetradentate N2O2-type ligand with cobalt(II) and iron(III) ions was investigated. Dinuclear cobalt(II) and trinuclear iron(III) complexes were synthesized, and their structures and magnetic properties were studied. The results showed that the complexes exhibited different magnetic interactions mediated by different bridging groups.