Volume 60, Issue 52 pp. 27282-27287
Communication

Magnetization Dynamics on Isotope-Isomorphic Holmium Single-Molecule Magnets

Dr. Yang Liu

Dr. Yang Liu

Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

These authors contributed equally to this work.

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Dr. Le Tuan Anh Ho

Dr. Le Tuan Anh Ho

Department of Chemistry, National University of Singapore, Singapore, 117543 Singapore

These authors contributed equally to this work.

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Guo-Zhang Huang

Guo-Zhang Huang

Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

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Dr. Yan-Cong Chen

Dr. Yan-Cong Chen

Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

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Dr. Liviu Ungur

Corresponding Author

Dr. Liviu Ungur

Department of Chemistry, National University of Singapore, Singapore, 117543 Singapore

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Dr. Jun-Liang Liu

Corresponding Author

Dr. Jun-Liang Liu

Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

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Prof. Dr. Ming-Liang Tong

Prof. Dr. Ming-Liang Tong

Key Lab of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

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First published: 20 October 2021
Citations: 12

Graphical Abstract

We reported the nuclear-spin driven magnetization dynamics involving both metal ion and the ligand, for first time, in two HoIII isomorphic single-molecule magnets, where the behavior is originated from the super-hyperfine interaction related to the difference in nuclear spin number of protium (I=1/2) and deuterium (I=1).

Abstract

Here we reported the deuteration of the metal-binding equatorial water molecules in a reported HoIII single-molecule magnet (SMM) with pentagonal-bipyramidal geometry, from [Ho(CyPh2PO)2(H2O)5]3+ to [Ho(CyPh2PO)2(D2O)5]3+. The hyperfine structures originating from the nuclear spin of 165HoIII can be clearly observed. Moreover, the resulting magnetization dynamics revealed the switch of the relative relaxation rates for the two isotope-isomorphic complexes—respectively faster/slower at low/high temperature. The noticeable isotope effect arises from not only the paramagnetic metal center but also the diamagnetic ligands, which can be explained by the ab initio calculated tunnel splitting and the involvement of the super-hyperfine interaction related to the difference in the nuclear spin number of protium (1H, I=1/2) and deuterium (2H, I=1).

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