A Chiral Thermochromic Ferroelastic with Seven Physical Channel Switches

Abstract

Switchable materials play an invaluable role in signal processing and encryption of smart devices. The development of multifunctional materials that exhibit switching characteristics in multiple physical channels has attracted widespread attention. Now, two chiral thermochromic ferroelastic crystals (S‐CTA)2CuCl4 and (R‐CTA)2CuCl4 (CTA=3‐chloro‐2‐hydroxypropyltrimethylammonium) have been prepared with switchable properties in dielectricity, conductivity, second harmonic generation (SHG), piezoelectricity, ferroelasticity, chiral, and thermochromic properties. Compared with traditional phase‐transition materials with switching features, thermochromism brings additional spectral encryption possibilities for future information processing. To the best of our knowledge, this is the first chiral thermochromic ferroelastic that exhibits switching properties in seven physical channels. This work is expected to promote further exploration of multifunctional molecular switchable materials.

Giant Optical Activity and Second Harmonic Generation in 2D Hybrid Copper Halides

“…Sargent and co‐workers demonstrated a 3 % spin‐polarized photoluminescence of reduced‐dimensional chiral perovskites even in the absence of an applied external magnetic field [10a] . Due to their non‐centrosymmetric structure, chiral hybrid metal halides can also been applied for second harmonic generation (SHG) [11] . For example, Xu and co‐workers determined second‐order nonlinear optical (NLO) coefficient of (R‐/S‐MPEA) 1.5 PbBr 3.5 (DMSO) 0.5 (MPEA=β‐methylphenethylamine) as approximately 0.68 pm V −1 at 850 nm [12] .…”

Giant Optical Activity and Second Harmonic Generation in 2D Hybrid Copper Halides

“…[10a] Due to their non-centrosymmetric structure, chiral hybrid metal halides can also been applied for second harmonic generation (SHG). [11] For example, Xu and co-workers determined second-order nonlinear optical (NLO) coefficient of (R-/S-MPEA) 1.5 PbBr 3.5 (DMSO) 0.5 (MPEA = b-methylphenethylamine) as approximately 0.68 pm V À1 at 850 nm. [12] Very recently, a series of chiral metal halides were manufactured by Heine and co-workers, [13] and the SHG signals were 5-45 times smaller than the quartz reference.…”

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

“…[14] Generally,f erroelastic phase transitions are accompanied by the evolution of ferroelastic domains. [15] We used polarized light microscopy to detect the ferroelastic domains in the crystal sample of AB-1. As shown in Figure 3, the as-grown crystal of AB-1 shows clear stripe ferroelastic domains at 253 K, which is very stable in the ferroelastic phase before the phase transition temperature.U pon heating, the domain structure disappears completely above the phase transition temperature,entering into the paraelastic phase.Upon cooling down, the fine stripe domain patterns reappear immediately below the phase transition temperature.T he evolution process of domain structure in AB-1 is perfectly reversible (Movie S1).…”