The reaction of MnCl·4HO with HL ((1-methyl-1H-imidazol-2-yl)methanol) and pdH (1, 3 propanediol) in a basic MeCN solution results in the formation of a mixed-valence [Mn] cationic cluster and two [MnCl] counter anions. The metallic skeleton of the cluster describes two geometrically equivalent mixed-valent, linked [Mn Mn ] supertetrahedra in which nearest-neighbor metal ions have a different oxidation state. Magnetic susceptibility, magnetization data and heat capacity measurements support evidence of predominant ferromagnetic correlations, leading to a = 22 spin ground state for the [Mn Mn ] supertetrahedra, which are pair-linked by a weak antiferromagnetic coupling. The properties are discussed in the context of the magnetocaloric effect and the potential application of this compound in cryogenic refrigeration.
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The reaction of MnCl·4HO with HL ((1-methyl-1H-imidazol-2-yl)methanol) and pdH (1, 3 propanediol) in a basic MeCN solution results in the formation of a mixed-valence [Mn] cationic cluster and two [MnCl] counter anions. The metallic skeleton of the cluster describes two geometrically equivalent mixed-valent, linked [Mn Mn ] supertetrahedra in which nearest-neighbor metal ions have a different oxidation state. Magnetic susceptibility, magnetization data and heat capacity measurements support evidence of predominant ferromagnetic correlations, leading to a = 22 spin ground state for the [Mn Mn ] supertetrahedra, which are pair-linked by a weak antiferromagnetic coupling.
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