As a mechanical analog of ferroelectricity and ferromagnetism, ferroelasticity has made outstanding contributions in the fields of energy conversion, information processing, and mechanical switching. However, the research on 2D ferroelasticity...

Organic–inorganic hybrid perovskites (OIHPs) with switchable properties are believed to be important as stimuli-responsive materials. Herein, we report two ABX2-type OIHPs: [(CH3)3NCH2R]2[Eu(H2O)]2­[CH2(SO3)2]4·2H2O (R = H, 1; F, 2) by using [CH2(SO3)2]2– bridged rare-earth (RE) ions. Meanwhile, these self-assembled host–guest compounds display structural phase transition with a dielectric switch and fluorescent response. Notably, H/F substitution enhanced the intermolecular interactions between the anionic host and the cationic guest. This results in skeleton deformation and changes in the spatial arrangement and symmetry of Eu3+. As a result, the phase transition temperature (T tr) moved up, and the fluorescence quantum yield (FQY) increased by 4.73%. The molecular assembly strategy proposed in this work will benefit the construction of new multifunctional stimuli-responsive materials.

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Molecular-based switchable dielectrics with distinct changes of dielectric constant, which enable conversion of electronic properties between different states under external stimuli, are technologically important. The crown-ether clathrate system is a...

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