Tetranuclear Hetro-Metal [MnIII2NiII2] Complexes Involving Defective Double-Cubane Structure: Synthesis, Crystal Structures, and Magnetic Properties

Tetranuclear hetero-metal Mn III 2Ni II 2 complexes, [Mn 2Ni 2(L) 4(OAc) 2] ( 1) and [Mn 2Ni 2(L) 4(NO 3) 2] ( 2) [H 2L = N-(2-hydroxymethylphenyl)-5,6-benzosalicylideneimine], have been synthesized and characterized by X-ray crystal structure analyses, infrared spectra, and elemental analyses. The structure analyses revealed that the complexes have a defective double-cubane metal core connected by μ 3-alkoxo bridges. Complexes consist of two bis-μ-alkoxo bridged Mn IIINi II heteronuclear units making a dimer-of-dimers structure. The double-cubane cores are significantly distorted due to an effect of syn–syn mode acetato or nitrato bridges. Magnetic measurements indicate that weak antiferromagnetic interactions (Mn-Ni = ？0.66 ~ ？4.19 cm –1) are dominant in the hetero-metal core. View Full-Tex