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Dinuclear Ln(III) complexes constructed from an 8-hydroxyquinoline Schiff base derivative with different terminal groups show differing slow magnetic relaxation

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Abstract

Two series of dinuclear LnIII complexes, namely, [Ln(tfa)2(L)]2 (Ln = Gd (1), Tb (2), Dy (3), Ho (4), Er (5)) and [Ln(tfa)2(L′)]2 (Ln = Gd (6), Tb (7), Dy (8), Ho (9), Er (10)) (tfa = trifluoroacetylacetonate, HL = 2-[[(4-methylphenyl)imino]methyl]-8-hydroxyquinoline and HL′ = 2-[[(4-ethylphenyl)imino]methyl]-8-hydroxyquinoline), were synthesized, and structurally and magnetically characterized. Measurements of alternating-current (ac) susceptibility revealed that complexes 3 and 8 display significant zero-field single-molecule magnetic (SMM) behaviors with barrier energies of Ueff/kB = 9.14 K, τ0 = 4.76 × 10−6 s and Ueff/kB = 17.50 K, τ0 = 3.96 × 10−6 s, respectively. The magnetic studies also revealed that 1 and 6 feature a magnetocaloric effect with magnetic entropy change of −ΔSm values for 1 and 6 of 19.72 J kg−1 K−1 and 19.37 J kg−1 K−1 at T = 2 K and ΔH = 7 T, respectively.

Graphical abstract: Dinuclear Ln(iii) complexes constructed from an 8-hydroxyquinoline Schiff base derivative with different terminal groups show differing slow magnetic relaxation

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Publication details

The article was received on 22 Dec 2016, accepted on 04 May 2017 and first published on 14 Jun 2017


Article type: Paper
DOI: 10.1039/C6NJ04035G
Citation: New J. Chem., 2017, Advance Article
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    Dinuclear Ln(III) complexes constructed from an 8-hydroxyquinoline Schiff base derivative with different terminal groups show differing slow magnetic relaxation

    Y. Chang, W. Wang, R. Zhang, H. Shen, X. Zhou, N. Wang, J. Cui and H. Gao, New J. Chem., 2017, Advance Article , DOI: 10.1039/C6NJ04035G

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