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

DOIFull Paper Access

67

Citations

88

References

2019

Year

Jingjing Lü, Vincent Montigaud, Olivier Cador, Jianfeng Wu, Lang Zhao, Xiaolei Li, Mei Guo, Boris Le Guennic, Jinkui Tang
Inorganic Chemistry

Abstract

Four hexanuclear circular helicates, {[Dy<sub>6</sub>L<sub>6</sub>(DMF)<sub>12</sub>]·6CF<sub>3</sub>SO<sub>3</sub>·12DMF}<sub>2</sub> (<b>1Dy</b>), {[Gd<sub>6</sub>L<sub>6</sub>(DMF)<sub>12</sub>]·6CF<sub>3</sub>SO<sub>3</sub>·12DMF}<sub>2</sub> (<b>1Gd</b>), [Dy<sub>6</sub>L<sub>6</sub>(DMF)<sub>10</sub>(H<sub>2</sub>O)<sub>2</sub>]·6ClO<sub>4</sub>·4H<sub>2</sub>O·10DMF (<b>2Dy</b>), and [Gd<sub>6</sub>L<sub>6</sub>(DMF)<sub>12</sub>]·6ClO<sub>4</sub>·2H<sub>2</sub>O·10DMF (<b>2Gd</b>), where DMF = <i>N</i>,<i>N</i>-dimethylformamide, were synthesized by employing a glutaratedihydrazide-bridged bis(3-methoxysalicylaldehyde) ligand (H<sub>2</sub>L) and characterized structurally and magnetically. Direct-current magnetic susceptibility studies indicated predominant weak antiferromagnetic exchange interactions among gadolinium analogues, which were quantified using the <i>PHI</i> software, giving <i>J</i> = -0.003 cm<sup>-1</sup> with <i>g</i> = 2.00 for <b>1Gd</b> and <i>J</i> = -0.001 cm<sup>-1</sup> with <i>g</i> = 2.02 for <b>2Gd</b>. Alternating-current magnetic susceptibility measurements indicated that complexes <b>1Dy</b> and <b>2Dy</b> show slow relaxation of magnetization behavior, further supported by theoretical calculations that also highlighted the toroidal arrangement of the magnetic moments.

References

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