Abstract
AbstractTwo tetranuclear manganese complexes, [NaMnIIMn3III(μ4‐O2–)(HL)3(SCN)4] (1) and [NaMnIIMn3III(μ4‐O2–)(HL)3Cl4][NaMnIIMn3III(μ4‐O2–)(HL)3Cl3(H2O)]ClO4·3.5H2O (2) were obtained from the reaction of manganese perchlorate with a quadridentate Schiff base ligand, 3‐(2‐hydroxybenzylideneamino)propane‐1, 2‐diol (H3L) derived from condensation of 2‐hydroxybenzaldehyde with 3‐amino‐1, 2‐propanediol, as well as the coligand KSCN or NaCl under basic conditions. Single‐crystal X‐ray studies reveal that those two complexes all have a mixed‐valent tetrahedral core, which contains an apical MnII ion and three basal MnIII ions situated in the [Mn3(μ4‐O2–)]7+ equilateral triangle plane. Fitting of the magnetic susceptibility data to the theoretical χmT vs. T expression, revealed that the presence of only antiferromagnetic interactions between the central metal atoms in 1, while both antiferromagnetic and ferromagnetic interactions are present in 2.
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