Plastic crystals, as a molecular material with multiple functions, have become a research hotspot in the exploration of new ferroelectric crystal compounds, especially due to their unique solid−solid phase transition properties. Based on this, we synthesized a new 0D organic−inorganic hybrid Fe-based plastic ferroelectric [(CH 3 ) 3 NCH 2 CHCH 2 ]FeCl 4 (1), which has a hightemperature phase transition point of 393 K, obvious ferroelectric domains, and spontaneous polarization and has been tested by dielectric and piezoelectric power microscopy (PFM) and ultraviolet absorption (UV−vis). At room temperature, it crystallizes in the space group Cmc2 1 and has an obvious SHG switch. In addition, compound 1 also has an optical narrow band gap of 2.45 eV, indicating that compound 1 is a high-quality semiconductor material. This work advances the development of plastic ferroelectrics and provides an avenue for exploring the frequency-doubling response and optoelectronic properties of high-temperature plastic ferroelectrics.

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...

Cyclic organic amines are emerging as excellent building blocks to assemble organic–inorganic hybrid phase transition materials due to their flexible cyclic structure. Here, we have assembled a 1D organic‐inorganic hybrid dielectric material C5H6NOPbBr3 (1) by alloying the cyclic organic amine 3‐hydroxypyridine. 1 displays a remarkable switchable dielectric response induced by an order‐disorder transformation of the organic moiety, this transformation behaviour is confirmed by DSC and Hirshfeld surface measurements. More interestingly, 1 has a narrowband emission (FWHM=4.64 nm) at 590 nm; FWHM is a major quality figure for narrowband photodetectors. In addition, 1 exhibits semiconducting properties with an indirect bandgap of 2.78 eV by the analysis of the UV‐Vis absorption results.

The combination of chirality and phase transition materials has broad application prospects. Therefore, based on the quasi‐spherical theory and the thought strategy of introducing chirality, we have successfully synthesized a pair of chiral enantiomeric ligand R/S‐triethyl (2‐hydroxy‐propyl) ammonium iodide, which can be combined with tin hexachloride anion to obtain a pair of new organic‐inorganic hybrid enantiomeric high‐temperature plastic phase transition materials: R/S‐[CH3CH(OH)CH2N(CH2CH3)3]2SnCl6 (1‐R/1‐S), which has a high temperature phase transition of Tc=384 K, crystallized in P21 chiral space group at room temperature, and has obvious CD signal. In addition, compound 1‐R and 1‐S also has good low‐loss dielectric switch and broadband gap. This work is conducive to the research of chiral high‐temperature reversible plastic phase transition materials, and promotes the development of multi‐functional phase transition materials.