Dielectric switching from a high temperature plastic phase transition in two organic salts with chiral features

Abstract

Organic ionic plastic crystals (OIPCs) with high-temperature reversible dielectric switching properties and single chiral characteristics and various structural phase transformations provide more possibilities for different functional properties. Here, we successfully...

Organic Single-Component Enantiomers with High Phase Transition Temperatures and Dielectric Switching Properties

“…The CD spectra of 1-R and 1-S exhibit an almost mirror-image relationship, revealing the enantiomeric features. In recent years, chiral compounds have become a hot spot in chemical research due to their important applications in chiral recognition and nonlinear optical materials, and provide some inspiration for the exploration of chirality in life sciences. − …”

Dielectric switching in correlation with the structural phase transitions in tetrapropylammonium perchlorate

“…The attempts made to solve the structure of HT phase failed, presumably due to the lack of a simple transformation between the unit cell of RT and HT phases as well as a magnifying inherent disorder. It must be noted that the poor quality and highly disordered crystals in HT phase can be regarded as characteristic features for organic-inorganic hybrid compounds with perchlorate anions, such as TeEClO 4 3 or with chloromethyl-triethylammonium cations 20 RT phase. The asymmetric unit comprises two disordered ions: TePrA + with C and H atoms disordered over a mirror plane perpendicular to the c-axis direction and ClO 4 − with disordered O atoms (Figs.…”

“…It must be noted that the poor quality and highly disordered crystals in the HT phase can be regarded as characteristic features for organic-inorganic hybrid compounds with perchlorate anions, such as TeEClO 4 3 or with chloromethyl-triethylammonium cations' RT phase. 20 The asymmetric unit comprises two disordered ions: TePrA + with C and H atoms disordered over a mirror plane perpendicular to the c-axis direction and ClO 4…”

High-Tc Quadratic Nonlinear Optical and Dielectric Switchings in Fe-Based Plastic Crystalline Ferroelectric

“…Plastic crystals are composed of molecules with spherical structures, such as spherical-like adamantane molecules and tetrahedral-shaped tetrabromomethane molecules, which are easily rotated and lead to plastic crystals with high symmetry. 9,10 (ii) They are malleable. Compared with directional ordered molecules, plastic crystals have more directional disordered molecules, which have weaker intermolecular interactions and stronger isotropy.…”

“…Plastic crystals have attracted great interest because they exhibit a variety of interesting properties and functions. , Its various functional properties are caused by the rapid rotational motion of molecules, which are commonly detected using nuclear magnetic resonance (NMR) and dielectric spectroscopy. , The orientation disorder created by the rotational motion provides the following physical properties for the plastic crystalline materials: − (i) They have high symmetry. Plastic crystals are composed of molecules with spherical structures, such as spherical-like adamantane molecules and tetrahedral-shaped tetrabromomethane molecules, which are easily rotated and lead to plastic crystals with high symmetry. , (ii) They are malleable. Compared with directional ordered molecules, plastic crystals have more directional disordered molecules, which have weaker intermolecular interactions and stronger isotropy. , These characteristics and structures with high symmetry enable plastic crystals to have more low-energy dislocation slip surfaces .…”