Syntheses, structures and magnetic properties of tetra- and heptanuclear iron(III) clusters incorporating phosphonate ligands

A tetranuclear cluster [Fe4O(O2CMe)3(O3PC6H9)3(py)5(Cl)] (1) and a heptanuclear cluster compound [Fe7O2(O2CPh)9(O3PC6H11)4(py)6] (2) have been reported. Dominant antiferromagnetic interactions are found in both cases.