Citation: Qian-Cheng Luo, Ning Ge, Yuan-Qi Zhai, Tengbo Wang, Lin Sun, Qi Sun, Fanni Li, Zhendong Fu, Yan-Zhen Zheng. Switching the coordination geometry to enhance erbium(Ⅲ) single-molecule magnets[J]. Chinese Chemical Letters, ;2023, 34(5): 107547. doi: 10.1016/j.cclet.2022.05.061 shu

Switching the coordination geometry to enhance erbium(Ⅲ) single-molecule magnets

Qian-Cheng Luo ^a ,
Ning Ge ^a ,
Yuan-Qi Zhai ^a ,
Tengbo Wang ^b ,
Lin Sun ^c ,
Qi Sun ^d ,
Fanni Li ^e ,
Zhendong Fu ^{f, *,} ,
Yan-Zhen Zheng ^{a, *,}

a.
Frontier Institute of Science and Technology, School of Chemistry and School of Physics, Xi'an Jiaotong University, Xi'an 710054, China
b.
The School of Automation Science and Technology, Xi'an Jiaotong University, Xi'an 712000, China
c.
Institute of Molecular and Crystal Engineering, College of Chemistry and Chemical Engineering, Henan University, Kaifeng 475004, China
d.
Department of General Surgery, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
e.
Department of Talent Highland, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an 710061, China
f.
Neutron Platform, Songshan Lake Materials Laboratory, Dongguan 523808, China

zdfu@pku.edu.cn

yanzhen@nankai.edu.cn

Received Date: 24 April 2022
Revised Date: 6 May 2022
Accepted Date: 18 May 2022
Available Online: 23 May 2022

Figures(2)

Two erbium(Ⅲ) complexes [ErCl(OAr^Ad)₃][Na(THF)₆] (1) and Er(OAr^Ad)₃ (2) are successfully prepared by using one variety of "hard" base ligand with large steric hindrance. The coordination geometry around the Er(Ⅲ) site changes from distorted tetrahedral to flat trigonal pyramid geometry in different solvent environment due to the removal of the coordinated chloride. Such an alternation significantly enhances the single-molecule magnet (SMM) behavior and makes the field-induced effective energy barrier (U_eff) arrive at 43(1) cm⁻¹ for the latter. Together with theoretical calculations, this study shows that strong equatorial ligand field and high local symmetry are critical to suppress the quantum tunneling of the magnetization (QTM) and achieve high-performance erbium(Ⅲ) based SMMs.
- Single-molecule magnets,
- Erbium,
- Lanthanide complexes,
- Magnetic anisotropy,
- Slow magnetic relaxation
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