Novel 18-membered hexanuclear manganese metalladiazamacrocycle

The novel macrocyclic hexanuclear manganese(III) 18-Metallacrowns-6, [Mn6[(amshz)6(DMA)5(H2O)]·3DMA·H2O (1), has been synthesized by a self-assembly and characterized, where amshz3− is N-acetyl-4-methyl-salicylhydrazide. The ring is formed by the succession of six structural moieties of the type [Mn(III)NN] through hydrazide NN groups bridging the ring Mn ions. The ligand enforces the metal ions to form the stereochemistry of a propeller configuration with alternate …ΔΛΔΛ…-type chiral forms. The disc molecule offers a oval cavity with an entrance diameter ∼6.7 Å, inner largest diameter ∼9.6 Å and height ∼4.6 Å. The magnetic properties of the metallacrown are characterized by a weak antiferromagnetic exchange interaction, with the value of μeff = 12.10 μB at 300 K between the Mn3+ ion spins with S = 2 in the cyclic system.