Crystal Sponge Behavior in a Two-Dimensional Rare-Earth Hybrid Coordinate Polymer

Abstract

Stimuli-responsive multifunctional materials (SRMMs) have attracted tremendous attention due to their dynamic responses to external stimuli. However, it remains challenging to simultaneously achieve solvent-induced single-crystal to single-crystal (SCSC) transformation and structural phase transition after desolvation. Here, we report a two-dimensional (2D) rare-earth organic-inorganic hybrid coordinate polymer [(CH3)3NCH2Cl]2[Eu·H2O]2[CH2(SO3)2]4·2H2O (1) that exhibits a reversible SCSC transformation by changing to 2 ([(CH3)3NCH2Cl][Eu·H2O][CH2(SO3)2]2). Impressively, the SCSC transformation process couples with large changes in quantum efficiency dropped from 33.68% of 1 to 20.07% that of 2. Furthermore, polymer 2 shows an isomorphic structural phase transition associated with switching dielectric. Notably, the distance of the 2D layers shows reversible change during the two successive transition processes displaying a crystal sponge behavior. This work reveals the potential of rare-earth 2D hybrid coordination polymers in the design of multifunctional responsive materials and opens a new prospect to explore the construction of novel SRMMs.

Halogen-Regulated Tc and X-ray Radiation Detection in 2D Hybrid Perovskite Ferroelastic Semiconductor

“…Organic–inorganic hybrid perovskite (OIHPs) materials have wide potential applications in intelligent device fields such as information storage, shape memory, actuators, and X-ray radiation detection, etc. − On account of they behave the features of an easy synthesis process, tunable structure, and excellent performance. − To date, OIHPs have become a good platform to develop a large family of functional materials, such as ferroelectrics, piezoelectrics, ferroelastics, and photoelectric detectors, etc. − Similar to ferroelectricity and ferromagnetism, the nonlinear force hysteresis loop characteristic of the inherent spontaneous strain by mechanical force is defined as ferroelasticity. , The response of spontaneous strain orientation to force, light, and thermal stimuli provides potential applications of ferroelastics in mechanical switches, optical domain wall memories, pressure sensors, etc. − Notably, recent studies have shown that the ferroelastic domain walls of OIHPs contributing to microscopic carrier transport. ,, Therefore, the introduction of ferroelasticity into semiconductor materials may help to enhance the photoelectric detection property. However, 2D OIHPs ferroelastic crystals with an X-ray radiation current response have hardly been reported.…”

Multiaxial Multiferroicity with Large Spontaneous Polarization in a Hydroxyl-Modified Quinuclidinium Gallium(III) Chloride

“…Organic–inorganic hybrid materials (OIHMs) have attracted broad attention to exploring multiferroic materials due to their easy structural diversity and tunability, mild preparation conditions, and easy film-forming. − In particular, the inherent characteristic of OIHMs is the targeted design and performance optimization at the molecular level . As is well known, molecular ferroelectrics require a polar structure and symmetry breaking.…”