Novel 24-membered octanuclear manganese(III) metallacrown

Abstract

A novel octanuclear manganese metalladiazamacrocycle (1) was synthesized employing a new pentadentate ligand N-methacryl-5-methylsalicylhydrazide (H₃mamshz) by supramolecular self assembly. The backbone of this metal-organic assembly is a repeating unit of Mn–N–N–Mn linkage that extends to complete a 24-membered cyclic structure involving 8 manganese(III) centers. Successive manganese centers are in an octanuclear cyclic structure. The temperature-dependent magnetic properties show a typical weakly coupled antiferromagnetic behaviour.

KEY WORDS: Manganese, Octanuclear, Metalladiazamacrocycle, Pentadentate ligand, Antiferromagnetic behavior

Bull. Chem. Soc. Ethiop. 2014, 28(3), 403-408.

DOI: http://dx.doi.org/10.4314/bcse.v28i3.9