From the journal:

Chemical Communications

[ICl4]−: A large anisotropic planar anion group produces giant birefringence

Yi-Chen Liu,ab   Ming-Zhi Zhang,ab   Chun-Li Hua  and  Jiang-Gao Mao ORCID logo *ab  

* Corresponding authors

a State Key Laboratory of Functional Crystals and Devices, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, P. R. China

b University of Chinese Academy of Sciences, Beijing 100039, P. R. China
E-mail: mjg@fjirsm.ac.cn

Abstract

We designed the highly anisotropic planar [ICl4]− group. It enabled exceptional birefringence (Δn = 1.162 at 546 nm) and broad mid-infrared transparency (0.36–6 µm) in C5H7N2ICl4. This study provides a novel strategy for obtaining high-performance mid-IR birefringent crystals.

Graphical abstract: [ICl4]−: A large anisotropic planar anion group produces giant birefringence

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Article information

DOI
https://doi.org/10.1039/D6CC00713A
Article type
Communication
Submitted
03 Feb 2026
Accepted
12 Mar 2026
First published
13 Mar 2026

Chem. Commun., 2026, Advance Article

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[ICl4]−: A large anisotropic planar anion group produces giant birefringence

Y. Liu, M. Zhang, C. Hu and J. Mao, Chem. Commun., 2026, Advance Article , DOI: 10.1039/D6CC00713A

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