In situ observation of ferroelastic domain and phase transition in a three-dimensional molecular crystal

Chemistry. 2021 Oct 18. doi: 10.1002/chem.202103229. Online ahead of print.ABSTRACTMassive efforts have been devoted to designing molecular ferroic materials by molecular modification. For molecular ferroelastic, previous work is focused on the temperature-dependent ferroelastic domains, however, few are related to controlling the ferroelastic domain by the stress. Inspired by the "quasi-spherical theory" and fluorination effect, we designed a more flexible (MedabcoF) 2+ (MedabcoF= 1-fluoro-4-methyl-1,4-diazoniabicyclo[2.2.2]octane) cation by introducing a methyl group and a fluorine atom at the two symmetrical ends of the Dabco (1,4-diazoniabicyclo[2.2.2]octane) and synthesized a hybrid 3D perovskite (MedabcoF)Rb(BF 4 ) 3 (1) which displays three reversible phase transitions accompanying dual ferroelastic behavior. Besides, it not only exhibits ferroelastic domains switching by the thermal stimulation, and the sensitive reaction of in situ domains under the stress of it is also realized. This work not only achieves a force-controlled ferroelastic domain but develops a more profound comprehension of the relationship between the thermal motion behavior of guest cations and the intriguing properties of materials.PMID:34661945 | DOI:10.1002/chem.202103229

Source: Chemistry - October 18, 2021 Category: Chemistry Authors: Sai-Nan Cheng Kun Ding Tie Zhang Zhi-Xu Zhang Chang-Yuan Su Jia-Zhen Ge Yi Zhang Da-Wei Fu Source Type: research