High‐Temperature Reversible Phase Transition and Switchable Dielectric and Semiconductor Properties in a 2D Hybrid [(C₃H₁₂N₂O)CdCl₄]_n

Abstract

Solid reversible phase transitions in organic‐inorganic hybrids exhibiting both high temperatures and multifunction are comparatively rare. Here we present a novel “ABX4” type two dimensional organic‐inorganic hybrid [(C3H12N2O)CdCl4]n (1) (A = C3H12N2O = deprotonated 1,3‐Diamino‐2‐propanol, B = Cd and X = Cl), which showing ultra‐high solid reversible phase transition temperature of 393 K. The experiment results show that this reversible phase transition is due to the combined actions of order‐disorder and the pendulum of d1,3‐diamino‐2‐propanol guest molecules as well as the twist of Cd–Cl–Cd anions framework. In addition, both UV/Vis diffuses reflectance spectrometry and DFT calculation confirms that 1 has a direct band gap with value close to 4.40 eV. These results indicate that 1 has dielectric switchable property and potential applications in semiconductors.

Organic–inorganic interactions revealed by Raman spectroscopy during reversible phase transitions in semiconducting [(C2H5)4N]FeCl4

“…So, it is therefore crucial to better explore the physical properties of switchable materials and investigate, with accuracy, their reversible phase transitions at high temperatures ( T > 273 K). 22 …”

High-Temperature Phase Transition with Switchable Dielectric Behavior and Significant Photoluminescence Changes in a Zero-Dimensional Hybrid SbBr6 Perovskite

“…Through a deep understanding of phase change and crystal structure, it has been found that halogenated antimonite(III) and halogenated bismuth(III) not only have special performance structures but also can effectively achieve the application of PCMs in the field of multifunctional materials. 12 These crystal structures are mostly composed of twisted MX 6 octahedra, which are either isolated or share angles, faces, or edges. 16 The types of inorganic anions and electronegativity of organic cations play important roles in the hybrid metal halide structure.…”

“…This type of material has sparked new interest in incorporating other metal halide materials into multifunctional material applications. Through a deep understanding of phase change and crystal structure, it has been found that halogenated antimonite­(III) and halogenated bismuth­(III) not only have special performance structures but also can effectively achieve the application of PCMs in the field of multifunctional materials . These crystal structures are mostly composed of twisted MX 6 octahedra, which are either isolated or share angles, faces, or edges .…”

A multifunctional molecular ferroelectric with chiral features, a high Curie temperature, large spontaneous polarization and photoluminescence: (C9H14N)2CdBr4

“…At the same time, these materials show a wealth of photoelectric properties, including the ability to detect X-ray, luminescence and tunable band gap. [6][7] On the one hand, organic-inorganic hybrid metal halide not only inherits the advantages of organic part but also inherits the advantages of inorganic part, which makes it have the properties of switching dielectric switch and photoluminescence in a compound; On the other hand, the stable luminescent properties can be obtained by introducing metal ions into inorganic components. [8][9][10] Although great progress has been made in the research of ferroelectrics in recent ten years, the combination of ferroelectric materials and practical applications makes high temperature phase transition materials more ideal, 11 such as DIPAX(DIPA = diisopropylaminium; X = Cl, Br, ClO 4 -)(T c = 426 K); 12 hexane-1,6diammonium pentaiodobismuth (HDA-BiI 5 )(T c = 380 K) has the highest phase transition temperature and the narrowest band gap (E g = 1.89 eV); 13 [(R)-N-(1-phenylethyl)ethane-1,2diaminium]PbI 4 (T c = 378 K); 14 (4,4-Difluoropiperidinium) 4 AgBiI 8 (T c = 422 K).…”