A new family of interdimer [MnII2LnIII2]2 clusters: Syntheses, structures, and magnetic properties

A new family of isostructural Mn/Ln clusters: [MnII2LnIII2(hmp)6(NO3)4(CH3OH)2][MnII2LnIII2(hmp)6(NO3)4(H2O)2] ([Ln = Gd (1), Tb(2), Dy(3), hmpH = 2-(hydroxymethyl)pyridine]) have been synthesized by the reaction of Mn(NO3)2 and Ln(NO3)3·6H2O with hmpH as ligand under solvothermal conditions. Compounds 1–3 are isostructural and possess butterfly core. That the antiferromagnetic interactions within compounds 1–3 were suggested by soild-state dc magnetic susceptibility analyses. Compound 1 displays a magnetic-caloric effect (MCE) with 21.91 J Kg− 1 K− 1 of the entropy change at 5 K for ΔH = 8 T. Compounds 2 and 3 exhibit frequency-dependent ac susceptibility signals suggestive of slow magnetic relaxation.

Graphical abstractNew examples of 3d/4f interdimer clusters have been yielded using simple metal salts by solvothermal method. Compound 1 displays a magnetic-caloric effect, compounds 2 and 3 exhibit frequency-dependent ac susceptibility signals suggestive of slow magnetic relaxation.Figure optionsDownload full-size imageDownload as PowerPoint slide