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Issue 21, 2018
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Self-assembly of rare octanuclear quad(double-stranded) cluster helicates showing slow magnetic relaxation and the magnetocaloric effect

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Abstract

Four rare quad(double-strand) cluster helicates containing Ln8 polyhedron cores, namely [Ln8(HL)4L4(OH)6(H2O)2(acac)2](ClO4)4·2CH3OH·12H2O (Ln = Gd for 1, Tb for 2, Dy for 3, and Ho for 4, respectively), have been assembled by using lanthanide salts and flexible ligands of H2L obtained from a 1 : 2 condensation reaction between 1,1′-(2,6-pyridyl)bis-1,3-butanedione and 2-aminophenol. In each complex, four pairs of organic ligands (HL and L2−) wrap the Ln8 polyhedron presenting a bicapped face-sharing double cubane configuration in a propeller-like form, resulting in the formation of octanuclear quad(double-stranded) helicates by coordination interactions of Ln–O/N bonds. The dc magnetic susceptibility measurements of complex 1 suggested the existence of weak antiferromagnetic couplings between neighboring GdIII ions and the magnetocaloric effect with −ΔSmaxm = 22.9 J kg−1 K−1 at 3.5 K for ΔH = 7 T. Ac magnetic susceptibility measurements of complex 3 at zero dc field demonstrated a slow magnetic relaxation behavior below 8.0 K with an effective energy barrier of 2.14 K.

Graphical abstract: Self-assembly of rare octanuclear quad(double-stranded) cluster helicates showing slow magnetic relaxation and the magnetocaloric effect

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Publication details

The article was received on 15 Aug 2018, accepted on 27 Sep 2018 and first published on 29 Sep 2018


Article type: Paper
DOI: 10.1039/C8NJ04169E
Citation: New J. Chem., 2018,42, 17652-17658
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    Self-assembly of rare octanuclear quad(double-stranded) cluster helicates showing slow magnetic relaxation and the magnetocaloric effect

    M. Yao, L. Cai, X. Deng, W. Zhang, S. Liu and X. Cai, New J. Chem., 2018, 42, 17652
    DOI: 10.1039/C8NJ04169E

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