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Structures and magnetic properties of novel Ln(III)-based pentanuclear clusters: magnetic refrigeration and single-molecule magnet behavior

Abstract

Six new and novel polynuclear LnIII5 clusters, formulated as [Ln5(L)4(acac)7]·solvents (Ln(III) = Sm (1), Eu (2), Gd (3), Tb (4), Dy (5) and Ho (6), Hacac = acetylacetone, and H2L = 2-[(2-(hydroxyimino)propanehydrazide)methyl]-5-hydroxymethyl-2-furancarboxylic acid) have been successfully obtained through the reaction of a polydentate Schiff base ligand (H2L) and Ln(acac)3·2H2O. Single crystal X-ray diffraction indicate that clusters 1-6 are isostructural and the central Ln(III) ions of them are Ln(III)5 chain arrangement. Magnetic properties investigations show that the Gd(III)-based cluster (3) exhibit significant and larger MCE with the maximum −ΔSm value of 34.02 J kg−1 K−1 (ΔH = 7.0 T and T = 2.0 K). Alternating current (ac) susceptibility measurements of the Dy(III)-based cluster (5) displays remarkable slow magnetic relaxation behaviors at zero applied direct current (dc) magnetic field (ΔE/kB = 17.47 K and τ0 = 1.52 ×10-6 s). Furthermore, the solid-state fluorescent properties studies show that clusters 2, 4, and 5 display the characteristic lanthanum luminescence at room temperature.

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Supplementary files

Article information


Submitted
06 Sep 2020
Accepted
12 Oct 2020
First published
13 Oct 2020

New J. Chem., 2020, Accepted Manuscript
Article type
Paper

Structures and magnetic properties of novel Ln(III)-based pentanuclear clusters: magnetic refrigeration and single-molecule magnet behavior

W. Wang, T. Zhang, D. Wang and J. Cui, New J. Chem., 2020, Accepted Manuscript , DOI: 10.1039/D0NJ04469E

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