A new family of isostructural Mn–Ln heterometallic clusters, [MnII2MnIII2LnIII2(Piv)8(thme)2(H2tea)2] (H3thme = 1,1,1-tris(hydroxymethyl)ethane, Hpiv = pivalic acid, H3tea = triethanolamine, and Ln = Pr, Nd, Sm, Eu, Gd, Tb, and Dy) have been prepared by reaction of the hexanuclear manganese precursor, [Mn6O2(Piv)10(4-Me-Py)2.5(Hpiv)1.5], with H3thme, H3tea, and Ln(NO3)3·6H2O under the solvothermal conditions. Complexes 1Pr–7Dy were characterized by single-crystal X-ray diffraction and their core [Mn2IIIMn2IILn2III(μ3-OR)4(μ2-OR)6]6+ composed of four face-sharing defected cubane units. Antiferromagnetic (AF) exchange interactions were suggested for all of the complexes by solid-state dc magnetic susceptibility measurements. Complexes 6Tb and 7Dy, show frequency-dependent ac susceptibility signals suggestive of slow magnetic relaxation.
Dalton Transactions
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