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Construction of a family of Ln3 clusters using multidentate Schiff base and β-diketonate ligands: fluorescence properties, magnetocaloric effect and slow magnetic relaxation

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Abstract

A family of μ-Oacylhydrazone-bridged Ln3 clusters, [Ln3(dbm)5(HL)2x[solvent] (Ln = Nd (1), Sm (2), Gd (3), Tb (4), Dy (5), Ho (6), and Er (7), H3L = N′-(2-hydroxybenzylidene)-6-(hydroxymethyl)picolinohydrazide, and Hdbm = dibenzoylmethane), was successfully obtained by using a multidentate hydrazone ligand and lanthanide β-diketone salts via a solvothermal method. The seven Ln3 clusters were characterized by performing infrared spectroscopy (IR), elemental analysis (EA), thermogravimetric analysis (TGA), UV-Vis spectroscopy and single-crystal X-ray diffraction. Structural analyses showed clusters 1–7 to be isostructural and to mainly contain three Ln(III) ions connected through four μ-Ohydrazone bridges. The magnetism investigations indicated showed cluster 3 displaying cryogenic magnetic refrigeration with a −ΔSm of 20.60 J K−1 kg−1 (T = 2.0 K, ΔH = 7.0 T); while cluster 5 showed slow magnetic relaxation with a ΔE/kB of 20.47 K and τ0 of 1.4 × 10−8 s. Moreover, solid-state fluorescence analyses showed clusters 2, 4 and 5 displaying the characteristic lanthanum luminescence at room temperature.

Graphical abstract: Construction of a family of Ln3 clusters using multidentate Schiff base and β-diketonate ligands: fluorescence properties, magnetocaloric effect and slow magnetic relaxation

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Supplementary files

Article information


Submitted
08 Mar 2020
Accepted
11 May 2020
First published
11 May 2020

New J. Chem., 2020, Advance Article
Article type
Paper

Construction of a family of Ln3 clusters using multidentate Schiff base and β-diketonate ligands: fluorescence properties, magnetocaloric effect and slow magnetic relaxation

W. Wang, Y. Gao, R. Yue, N. Qiao, D. Wang, Y. Shi, H. Zhang and J. Cui, New J. Chem., 2020, Advance Article , DOI: 10.1039/D0NJ01172J

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