Lanthanide(III) Hexanuclear Circular Helicates: Slow Magnetic Relaxation, Toroidal Arrangement of Magnetic Moments, and Magnetocaloric Effects

Abstract : Four hexanuclear circular helicates, {[DyL(DMF)]·6CFSO·12DMF} (1Dy), {[GdL(DMF)]·6CFSO·12DMF} (1Gd), [DyL(DMF)(HO)]·6ClO·4HO·10DMF (2Dy), and [GdL(DMF)]·6ClO·2HO·10DMF (2Gd), where DMF = N, N-dimethylformamide, were synthesized by employing a glutaratedihydrazide-bridged bis(3-methoxysalicylaldehyde) ligand (HL) and characterized structurally and magnetically. Direct-current magnetic susceptibility studies indicated predominant weak antiferromagnetic exchange interactions among gadolinium analogues, which were quantified using the PHI software, giving J = -0.003 cm with g = 2.00 for 1Gd and J = -0.001 cm with g = 2.02 for 2Gd. Alternating-current magnetic susceptibility measurements indicated that complexes 1Dy and 2Dy show slow relaxation of magnetization behavior, further supported by theoretical calculations that also highlighted the toroidal arrangement of the magnetic moments.
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Jingjing Lu, Vincent Montigaud, Olivier Cador, Jianfeng Wu, Lang Zhao, et al.. Lanthanide(III) Hexanuclear Circular Helicates: Slow Magnetic Relaxation, Toroidal Arrangement of Magnetic Moments, and Magnetocaloric Effects. Inorganic Chemistry, American Chemical Society, 2019, ⟨10.1021/acs.inorgchem.9b01068⟩. ⟨hal-02179644⟩

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