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Weak exchange coupling effects leading to fast magnetic relaxations in a trinuclear dysprosium single-molecule magnet

Abstract

Investigating the magnetic anisotropy and magnetic interactions of lanthanide complexes is of vital importance for an in-depth understanding their magnetic properties. Herein, we reported the synthetic, structural and magnetic studies of a triangular type dysprosium complex (1Dy3, [{(Cp)(Tp*)Ln(μ-bta)}3·2(thf)], Cp = C5H5, Tp* = hydrotris(3,5-dimethyl-1-pyrazolyl)borate anion, btaH = 1H-1,2,3-benzotriazole). Its mononuclear fragment, 2Dy ([(Cp)Dy(Tp)2·C7H8], Tp = hydrotris(1-pyrazolyl)borate), was also investigated by single-crystal angular-resolved susceptibility measurements and computational studies to help understand the magnetic anisotropy of 1Dy3. The easy axis of three Dy3+ ions in 1Dy3 were orientated out of the triangular dysprosium plane. The exchange interactions were small (-0.85 cm-1) but caused remarkable effects on magnetic relaxations at low temperature. In the temperature range from 2 K to 4 K, the magnetic relaxation occurred via the exchange-coupled low-lying excited states, inhibiting the magnetic hysteresis. Our study showed that weak intramolecular magnetic interactions can significantly affect the dynamic properties in the low temperature regime.

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Publication details

The article was received on 28 Sep 2019, accepted on 30 Oct 2019 and first published on 31 Oct 2019


Article type: Research Article
DOI: 10.1039/C9QI01252D
Inorg. Chem. Front., 2019, Accepted Manuscript

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    Weak exchange coupling effects leading to fast magnetic relaxations in a trinuclear dysprosium single-molecule magnet

    Y. Meng, Y. Qiao, M. Yang, J. Xiong, T. Liu, Y. Zhang, S. Jiang, B. Wang and S. Gao, Inorg. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C9QI01252D

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