This study designs the highly anisotropic planar [ICl4]- group, which enables exceptional birefringence (Δn = 0.94 at 546 nm) and broad mid-infrared transparency (0.36 -6 µm) in C5H7N2ICl4, providing a novel strategy for high-performance mid-IR birefringent crystals.
Y. Liu, M. Zhang, C. Hu and J. Mao, Chem. Commun., 2026, Accepted Manuscript , DOI: 10.1039/D6CC00713A
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