A notable reversible thermochromic (3,3-difluoropyrrolidinium)2[CuCl4] with ferroelectricity and ferroelasticity

Crystal Structure and Optical Properties Characterization in Quasi-0D Lead-Free Bromide Crystals (C6H14N)3Bi2Br9·H2O and (C6H14N)3Sb3Br12

“…To explore the optical properties of the crystals 1 and 2 , we tested the ultraviolet–visible absorption spectrum from 200 to 600 nm. From the Figures a,d, both of the crystals 1 and 2 have strong light absorption below 400 nm, which is consistent with the yellow nature of the crystal . The absorption spectra of crystals mainly show two characteristic absorption peaks at around 260 and 370 nm, which is ascribed to interband absorption of organic electrons C and the orbital transition absorption peak of metal atom, respectively …”

“…From the Figures 4a,d, both of the crystals 1 and 2 have strong light absorption below 400 nm, which is consistent with the yellow nature of the crystal. 30 The absorption spectra of crystals mainly show two characteristic absorption peaks at around 260 and 370 nm, which is ascribed to interband absorption of organic electrons C 26 and the orbital transition absorption peak of metal atom, respectively. 31 The absorption coefficient rapidly increases over the wavelength of 400 nm, which corresponds to the intrinsic absorption region of the crystal, and the absorption edge reflects the characteristics of the optical band gap.…”

Reversible phase transition and thermochromic response in hybrid copper-based perovskites

“…42,57 According to the correlation between the position of the absorption maximum for the d–d transition and the coordinate geometry of the central Cu 2+ ion, the deformation of a Cu II halide polyhedron causes a shift in the electronic absorption band, resulting in a color change in organic–inorganic Cu II halides. 58–61…”

Advances in the modulation engineering of ferroelectrics and multiferroics with non-chemical agents and factors: a review

“…88 Thus, inorganic–organic hybrid multiferroic materials can simultaneously exhibit two or more properties such as ferroelectricity, ferromagnetism, and ferroelasticity. 27,89 In 2022, Xiong et al reported the preparation of a 2D hybrid perovskite based on Cr 2+ called [DFCBA] 2 CrCl 4 ([3,3-difluorocyclobutylammonium] 2 CrCl 4 ) (Fig. 6a).…”