Synthesis, structural characterization and magnetic properties of a novel metallacrown [Fe6(amshz)6(C3H7NO)6]·6CH3OH

The novel 18-metallacrown-6 metallamacrocycle, with the formula of [Fe6(amshz)6(C3H7NO)6]·6CH3OH (1), has been synthesized by the self-assembly reaction of iron ions with N-substituted salicylhydrazide ligands. Six Fe(III) ions and six deprotonated N-acetyl-3-methylsalicylhydrazide (amshz3−) ligands construct a planar 18-membered ring based on Fe–N–N–Fe linkage. Due to the coordination, the ligand enforces the stereochemistry of the Fe3+ ions as a propeller shape with alternating …ΔΛΔΛ… configurations. There exists a strong antiferromagnetic exchange interaction with μeff = 12.54 μB at 300 K between the Fe(III) spin 5/2 centers.

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