Domino Phase Transition and Luminescence Switching

Domino Phase Transition and Luminescence Switching

Author: Angewandte Chemie International Edition

Molecular recognition could have applications in fields like sensing, information storage, or anti-counterfeiting. The recognition between two solid-state crystalline materials, however, had not been reported thus far.

Zeping Wang, Xiaoying Huang, Fujian Institute of Research on the Structure of Matter, The Chinese Academy of Sciences, Fuzhou, Kezhao Du, Fujian Normal University, Fuzhou, China, and colleagues have synthesized two isomers of an antimony-based ionic liquid hybrid metal halide (ILMH), namely, α-[Bmmim]2SbCl5 (1, Bmmim = 1-butyl-2,3-dimethylimidazolium) and β-[Bmmim]2SbCl5 (2). Crystals of chiral 2 can transform into crystals of achiral 1 when they are in contact under ambient conditions (pictured), demonstrating an unusual phenomenon called crystalline phase recognition (CPR).

The distinct photoluminescent colors of 1 and 2 allowed the team to observe the CPR in situ. The transition first occurs at the initial contact area and then spreads spontaneously throughout the entire crystal. The process is called a domino phase transition. The results could have implications, e.g., for the field of time-resolved information encryption.



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