Controllable Structures Designed with Multiple-Dielectric Responses in Hybrid Perovskite-Type Molecular Crystals

Abstract

In this report, two new hybrid organic-inorganic perovskite-type compounds, (IBA)CdBr (1; IBA = isobutylammonium cation, i-CH-NH) and (IBA)CdBr (2), have been successfully synthesized by reasonable modulation of the ratio of the reactants. 1 with a one-dimensional (1D) chained structure presents sequential solid-state phase transitions, and 2 with a two-dimensional (2D) layered structure undergoes triple structural phase transitions. The phase transitions are attributable to the stepwise ordering process of the organic IBA cation of the title compounds, which also exhibit temperature-dependent dielectric transitions and dielectric anisotropies. Among the different structural environments, the dynamic motions of organic cations show distinct differences, driving the variation of physical properties.

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

“…), following a slowly increasing slope, while a reverse process appears around 393 K for the cooling run, where the dielectric constant falls from 9.5 to 8.4 (a.u.). Relative to heat response for phase transition, dielectric constant changes is slightly lagged; this dielectric constant switched mode was also reported in other early work , , , , . Besides, similar dielectric variation law also applies to other frequencies, such as 100 kHz (Figure S4).…”

“…Nevertheless, most organic‐inorganic hybrid reversible phase transition materials (OIHPTM) still suffer a few challenges, such as, i) a low phase transition temperature (usually below or in the vicinity of room temperature), however practical applications require higher temperature such as a automatic switch for a mobile phone's baterry, so exploration of switchable materials with high reversible phase transition temperature always is a goal for physicist and chemist;, ii) a single performance, they mainly focused on ferroelectric, switchable dielectric properties, etc. and the other physical properties such as conduct electricity are seldom reported , , .…”

Semi‐conductive, Switchable Dielectric and Photoluminescent Properties of Two High‐Temperature Phase Transition Hybrids

“…HOIMHs based on layered cadmium introduce important semiconductor features, making them promising semiconductor-dielectric phase transition materials. [25,26] Therefore, coupling semiconductor, photo-luminescent properties and switchable dielectric properties in high-temperature phase transitions materials provide a new way for exploring multifunctional phase transition materials.…”

Transition-Metal-Complex-Directed Synthesis of Hybrid Iodoargentates with Single-Crystal to Single-Crystal Structural Transformation and Photocatalytic Properties

“…Hence, the discovery of highly effective semiconductor photocatalysts is highly desirable. Organic–inorganic hybrid metal halides may function as semiconductors, − optical materials, − and phase transitions. − Among them, the iodoargentates are important metal halide hybrids with rich structural topologies and distinct properties of photo-/thermochromism − and photocatalysis. − In generally, the iodoargentate anions are composed of linear AgI 2 and AgI 3 triangles and AgI 4 tetrahedra, which may be condensed via Ag···Ag interactions and the sharing of corners, edges, and faces. − The variance of coordination geometries and connection approaches may generate numerous iodoargentates from discrete clusters (0D) to three-dimensional (3D) frameworks . Especially, the templated agents and structure-directing agents (SDAs) may provide an effective strategy to develop novel iodoargentates. ,− …”