Citation: Chuan-Xin Bao, Yu-Xia Li, Kai-Ge Gao, Cheng-Dong Liu, Jie-Sheng Hu, Hui Ai, Jun Tao, Zi-Shuo Yao. Tuning chiral-inversion temperature of protonated cystamine in perovskite compounds through halogen substitution[J]. Chinese Chemical Letters, ;2026, 37(6): 111386. doi: 10.1016/j.cclet.2025.111386 shu

Tuning chiral-inversion temperature of protonated cystamine in perovskite compounds through halogen substitution

Chuan-Xin Bao ^a ,
Yu-Xia Li ^{a, *,} ,
Kai-Ge Gao ^b ,
Cheng-Dong Liu ^a ,
Jie-Sheng Hu ^a ,
Hui Ai ^c ,
Jun Tao ^a ,
Zi-Shuo Yao ^{a, *,}

a.
Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, China
b.
College of Physical Science and Technology, Yangzhou University, Yangzhou 225009, China
c.
Analysis & Testing Center, School of Chemistry and Chemical Engineering, Liangxiang Campus, Beijing Institute of Technology, Beijing 102488, China

yuxiali1848@163.com

zishuoyao@bit.edu.cn

Received Date: 27 March 2025
Revised Date: 20 May 2025
Accepted Date: 28 May 2025
Available Online: 28 May 2025

Figures(7)

Tuning molecular chirality through external stimuli stands at the forefront of chemical science. Here, we systematically examine the stereodynamic properties of a series of Cu(Ⅱ)-based perovskite single crystals, CystaH₂[CuCl_(4-_x₎Br_x] (CystaH₂ = protonated cystamine cation, x = 0.74, 0.80, 1.05, 1.11, 1.18), which undergo a polar-to-nonpolar ferroelectric phase transition. In these compounds, the symmetry breaking structural change is governed by an unusually thermally driven P ↔ M helical inversion of the helical CystaH₂²⁺ organic cations. The conformational inversion can be substantially modulated by bromide doping. As the bromide content increases, the phase-transition temperature progressively shifts closer to room temperature, decreasing by up to 49 K. Detailed structural analyses reveal that the chiral inversion of CystaH₂²⁺ is highly sensitive to local chemical environments, and this doping strategy offers an effective route for precisely governing temperature-mediated chiral transformations, thereby expanding the design space for advanced chiral materials.
- Molecular ferroelectric,
- Dielectric,
- Chirality inversion,
- Halogen doping,
- Phase transition
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