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Issue 14, 2017
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A Dy4 single-molecule magnet and its Gd(III), Tb(III), Ho(III), and Er(III) analogues encapsulated by an 8-hydroxyquinoline Schiff base derivative and β-diketonate coligand

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Abstract

Five new tetranuclear complexes based on an 8-hydroxyquinoline Schiff base derivative and the β-diketone coligand, [Ln4(acac)4L63-OH)2]·CH3CN·0.5CH2Cl2 (Ln = Gd (1), Tb (2), Dy (3), Ho (4) and Er (5); HL = 5-(benzylidene)amino-8-hydroxyquinoline; acac = acetylacetonate) have been synthesized, and structurally and magnetically characterized. Complexes 1–5 have similar tetranuclear structures. Each LnIII ion is eight coordinated and its coordination polyhedra can be described as being in a distorted square-antiprismatic geometry. The magnetic studies reveal that 1 features the magnetocaloric effect (MCE) with the magnetic entropy change of −ΔSm(T) = 25.08 J kg−1 K−1 at 2 K for ΔH = 7 T, and 3 displays the slow magnetic relaxation behavior of Single Molecule Magnets (SMMs) with the anisotropic barrier of 86.20 K and the pre-exponential factor τ0 = 2.99 × 10−8 s.

Graphical abstract: A Dy4 single-molecule magnet and its Gd(iii), Tb(iii), Ho(iii), and Er(iii) analogues encapsulated by an 8-hydroxyquinoline Schiff base derivative and β-diketonate coligand

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Publication details

The article was received on 12 Jan 2017, accepted on 10 Mar 2017 and first published on 10 Mar 2017


Article type: Paper
DOI: 10.1039/C7DT00118E
Citation: Dalton Trans., 2017,46, 4669-4677
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    A Dy4 single-molecule magnet and its Gd(III), Tb(III), Ho(III), and Er(III) analogues encapsulated by an 8-hydroxyquinoline Schiff base derivative and β-diketonate coligand

    H. Gao, X. Zhou, Y. Bi, H. Shen, W. Wang, N. Wang, Y. Chang, R. Zhang and J. Cui, Dalton Trans., 2017, 46, 4669
    DOI: 10.1039/C7DT00118E

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