Citation: Na Wang, Hongzhi Hu, Qiangqiang Jia, Yang Liu, Zunqi Liu, Dawei Fu. Halogen-substitution-induced magnetic-phase transition photoelectric synergy in L-valine crown ether inclusion complexes[J]. Chinese Chemical Letters, ;2026, 37(10): 111530. doi: 10.1016/j.cclet.2025.111530 shu

Halogen-substitution-induced magnetic-phase transition photoelectric synergy in L-valine crown ether inclusion complexes

Na Wang ^{a, 1} ,
Hongzhi Hu ^{a, 1} ,
Qiangqiang Jia ^b ,
Yang Liu ^{a, c, *,} ,
Zunqi Liu ^{a, c, *,} ,
Dawei Fu ^{a, b, *,}

a.
Chemistry and Chemical Engineering College Xinjiang Agricultural University, Urumqi 830052, China
b.
Institute for Science and Applications of Molecular Ferroelectrics, Key Laboratory of the Ministry of Education for Advanced Catalysis Materials, Zhejiang Normal University, Jinhua 321004, China
c.
Xinjiang Sub-Center National Engineering Research Center of Novel Equipment for Polymer Processing, Urumqi 830052, China

ly2021@xjau.edu.cn

lzq@xjau.edu.cn

dawei@seu.edu.cn

Received Date: 18 March 2025
Revised Date: 26 June 2025
Accepted Date: 2 July 2025
Available Online: 3 July 2025

Figures(6)

Molecular-based ferroelectrics have received extensive attention from materials scientists in recent years due to their light weight, high flexibility, and environmental friendliness. However, the precise design of molecular-based ferroelectrics by using crown ether supramolecular systems remains a huge challenge. In this work, L-valine (L-Val) and 18-crown-6 were selected as the guest and host molecules, respectively, for constructing crown ether complexes: [L-Val]₂⁺(18-crown-6)₃(H₂O)₂[FeX₄]₂^- (X = Cl (1), Br (2)) by halogen modulation. The results indicated that compound 1 exhibits a reversible phase transition accompanied by symmetry evolution from P1 to I2/m at room temperature. The implementation of halogen substitution strategy resulted in compound 2 crystallizes in C2/m space group, and the phase transition temperature was changed by 30 K. Meanwhile, oscillations of supramolecular groups within the framework conferred significant coupled physical properties, including reversible dielectric anomalies, reversible magnetic transfers, spin crossovers (SCOs), the band gap value decreases, paraelectric–ferroelectric phase transitions, and a second-harmonic generation (SHG) response. In short, this work provides a brand new perspective on expanding the multifunctionality of crown ether supramolecular systems.
- Ferroelectrics,
- Phase transition,
- Halogen modulation,
- Amino acids,
- Reversible dielectric properties
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