Enantiomeric Ferroelectric Chiral Domains DOI
Xian‐Jiang Song, Yong Ai, Xiaogang Chen

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: 147(19), P. 16568 - 16577

Published: April 29, 2025

Chiral ferroelectric crystals with inherent chirality and spontaneous polarization have recently gained considerable interest. However, the chiral topological texture, which provides a promising platform for exploring exotic functionalities, has never been found in enantiomeric crystals. Here, we report pair of molecular ferroelectrics, [RFAO][ReO4] [SFAO][ReO4] (RFAO/SFAO = (4R,5R/4S,5S)-4-fluoro-1-azabicyclo[3.2.1]octane). The enantiomers crystallize chiral-polar point group 2 at room temperature undergo two phase transitions an Aizu notation 222F2 350 K 432F2 463 K, respectively. Such enable them to show multistep switchable second-harmonic generation circular dichroism (SHG-CD) effect from high low off (inactive) SHG-CD states. More importantly, observed spiral domains enantiomers. To best our knowledge, this is first discovery Our breakthrough findings give new sights into interplay between will greatly stimulate further exploration next-generation electronic-photonic devices.

Language: Английский

Halogen Modulation and Physical Property Variation in Two Novel Mixed‐Cation Organic‐Inorganic Hybrid Perovskites† DOI Open Access
Xiaomei Fu, Zining Zhou,

Yawen Yang

et al.

Chinese Journal of Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 11, 2025

Comprehensive Summary Organic‐inorganic hybrid perovskites (OIHPs) offer precise control over material properties through the substitution of organic cations and halogens. In this study, two OIHPs, [(C 6 H 10 P)( n ‐BA)]Sb 2 X 9 ([C P] + = [Me 3 PCH CH ] , [ ‐BA] ‐butylamine cation, I ( 1 ), Br )), were synthesized by varying halogens within a mixed‐cation system. The halogen induced shift from compound which remains stable without phase transitions, to undergoes ferroelastic transition mmmF 2/ m ). Compound crystallizes in non‐centrosymmetric Pca space group demonstrates second harmonic generation (SHG) response, while displays elasticity nanoindentation tests. Halogen alters Sb—X bond lengths, inducing structural distortions inorganic framework influencing spatial configuration anions. These changes lead distinct crystallization behaviors, resulting different physical for compounds . This work contributes development multifunctional materials based on regulation OIHPs.

Language: Английский

Citations

0
Spatial Symmetry Operation Breaking Sulfur-Chiral Photoswitchable Ferroelectrics DOI
Huanhuan Chen, Hang Peng,

Zhe‐Kun Xu

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: March 12, 2025

Ferroelectrics with switchable spontaneous polarization have gained enormous attention for a century. However, the structural phase transitions of conventional ferroelectrics been mainly limited to ones crystallographic point group changes accompanied by breaking spatial symmetry elements. Moreover, although chiral and photoswitchable both great interest in recent years, heteroatomic never reported. Herein, first time, we designed pair sulfur-chiral (Rs Ss)-N-(3-bromo-5-chloro-2-hydroxybenzylidene)-2-methylpropane-2-sulfinamide (1-Rs 1-Ss). Notably, they undergo transition from polar C2 P21 space 2 at around 142 K, operation 2-fold rotation screw only P21. Such same group, while different groups operations, is significantly distinct ferroelectrics. Furthermore,1-Rs exhibits highest piezoelectric d33 value 10 pC/N among organic shows optical control ferroelectric polarization. To our knowledge, this report showing change. This work enriches family provides inspiration exploitation

Language: Английский

Citations

0
Two-photon excited spin excitonic properties in two-dimensional chiral perovskite films DOI
Junzi Li,

Xin Qiu,

Yi Chen

et al.

Applied Physics Letters, Journal Year: 2025, Volume and Issue: 126(15)

Published: April 14, 2025

Two-dimensional (2D) chiral perovskites exhibit strong circular dichroism and two-photon absorption (TPA). A comprehensive understanding of the excited spin excitonic properties in 2D is essential for development chirality related nonlinear optical (NLO) devices. In this work, we have constructed a series with TPA coefficients using an achiral organic spacer cation alloying strategy. Importantly, carrier dynamics has been investigated, which different responses to left-handed right-handed circularly polarized light. Interestingly, microscopic images luminescence (CPL) are demonstrated, confirming they possess large dissymmetry factors CPL. This work not only sheds light on mechanism but also confirms feasibility their application NLO

Language: Английский

Citations

0
Enantiomeric Ferroelectric Chiral Domains DOI
Xian‐Jiang Song, Yong Ai, Xiaogang Chen

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: 147(19), P. 16568 - 16577

Published: April 29, 2025

Chiral ferroelectric crystals with inherent chirality and spontaneous polarization have recently gained considerable interest. However, the chiral topological texture, which provides a promising platform for exploring exotic functionalities, has never been found in enantiomeric crystals. Here, we report pair of molecular ferroelectrics, [RFAO][ReO4] [SFAO][ReO4] (RFAO/SFAO = (4R,5R/4S,5S)-4-fluoro-1-azabicyclo[3.2.1]octane). The enantiomers crystallize chiral-polar point group 2 at room temperature undergo two phase transitions an Aizu notation 222F2 350 K 432F2 463 K, respectively. Such enable them to show multistep switchable second-harmonic generation circular dichroism (SHG-CD) effect from high low off (inactive) SHG-CD states. More importantly, observed spiral domains enantiomers. To best our knowledge, this is first discovery Our breakthrough findings give new sights into interplay between will greatly stimulate further exploration next-generation electronic-photonic devices.

Language: Английский

Citations

0