Abstract
Reactions of 2,4-dihydroxyacetophenone oxime with manganese salts yielded two manganese crowns, [Mn3(μ 3-O)(4-OH-Me-sao)3(HCOO)(MeOH)5]·MeOH (1) and [Mn3(μ 3-O)(4-OH-Me-sao)3(CH3COO)(MeOH)5]·MeOH (2) (4-OH-Me-saoH2=2,4-dihydroxyacetophenone oxime). Both compounds possess [MnIII 3(μ 3-O)]7+ cores which contain 9-MC-3 metallacrown (MC) rings with the repeating pattern [–Mn–N–O–]. However, the difference in the structures of both compounds is coordinated carboxylates. In 1 and 2, the MC molecules are connected with each other through intermolecular hydrogen bonds, generating similar 3-D supramolecular networks. Magnetic properties reveal that in 1 and 2 the metal ions exhibit ferromagnetic exchange coupling.
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