24-Membered octanuclear manganese metalladiazamacrocycle

The novel macrocyclic octanuclear manganese(III) 24-metallacrown-8 [Mn8(C96N16O24H104)6(DMF)7(H2O)·3DMF·4.5H2O (1), has been self-assembly synthesized and characterized. The pentadentate ligand is N-isobutyryl-5-methylsalicylhydrazide (H3ibumshz). The supramolecular complex assumes a nearly planar cyclic structure with succession of eight structural moieties of the type [Mn(III)–N–N8 and measure ∼22.74 Å in outer diameters. The chiralities of the manganese centers on the metalladiazamacrocycle occur in alternating ···ΔΛΔΛ··· configurations. The title 24-metallacrown-8 has no crystallographic centrosymmetry. The magnetic property of the title 24-metallacrown-8 exhibits a weak antiferromagnetic exchange interaction.