Observation of Transition from Ferroelasticity to Ferroelectricity by Solvent Selective Effect in Anilinium Bromide.

Observation of Transition from Ferroelasticity to Ferroelectricity by Solvent Selective Effect in Anilinium Bromide.
Angew Chem Int Ed Engl. 2021 Jan 21;:
Authors: Fu DW, Gao JX, Huang PZ, Ren RY, Shao T, Han LJ, Liu J, Gong JM
Abstract
Organic ferroelectrics are highly desirable for their lightweight, mechanical flexibility and biocompatibility. However, the rational design of organic ferroelectrics has always been faced with great challenges. Anilinium bromide (AB) has two structures reported in the Cambridge Crystallographic Data Centre, which might be an mmm F2/ m type ferroelastic (AB-1). When we studied its ferroelasticity, we were surprised to discover that there was another crystal (AB-2) in H 2 O besides this one, and they were very difficult to separate. By changing the solvent, we found that AB-1 crystals could be formed in ethanol, where ferroelastic domains were visualized by polarized light microscopy, and AB-2 crystals could be obtained from various crystallisation solvents of methanol, isopropanol, N -butanol, acetonitrile, dimethyl sulphoxide, and N , N -dimethylformamide, which undergo a ferroelectric phase transition with mm 2F m , showing clear ferroelectricity in two phases. To our knowledge, the regulation of ferroelasticity to ferroelectricity by solvent selective effect is unprecedented in the field of ferroelectrics. This work offers an efficient exploratory path to enriching the family of organic ferroelectr...

Source: Angewandte Chemie - January 21, 2021 Category: Chemistry Authors: Fu DW, Gao JX, Huang PZ, Ren RY, Shao T, Han LJ, Liu J, Gong JM Tags: Angew Chem Int Ed Engl Source Type: research