10.1021/acs.jpclett.9b03556.s005 Lu-Lu Chu Lu-Lu Chu Tie Zhang Tie Zhang Wan-Ying Zhang Wan-Ying Zhang Ping-Ping Shi Ping-Ping Shi Ji-Xing Gao Ji-Xing Gao Qiong Ye Qiong Ye Da-Wei Fu Da-Wei Fu Three-Dimensional Metal-Free Molecular Perovskite with a Thermally Induced Switchable Dielectric Response American Chemical Society 2020 dielectric response behaviors report temperature-dielectric-responsive metal-free perovskite BF Three-Dimensional Metal-Free Molecular Perovskite application representative switchable dielectric materials H 2 dabco switchable dielectric perovskite materials show formula ABX 3 dielectric response Thermally Induced Switchable Dielectric Response Temperature-responsive materials 2020-02-14 15:08:43 Dataset https://acs.figshare.com/articles/dataset/Three-Dimensional_Metal-Free_Molecular_Perovskite_with_a_Thermally_Induced_Switchable_Dielectric_Response/11855613 Temperature-responsive materials with switching physical properties have been widely researched. Among them, the switchable dielectric perovskite materials show potential applications in the electrical and electronic industries and even the intelligence industries. However, perovskite oxides and hybrid organic–inorganic perovskites, as the most representative switchable dielectric materials, are limited by bad biocompatibility. Herein, we report temperature-dielectric-responsive metal-free perovskite (H<sub>2</sub>dabco)­(NH<sub>4</sub>)­[BF<sub>4</sub>]<sub>3</sub> constructed by the strategy of substituting the B site in the general formula ABX<sub>3</sub> (doubly protonated 1,4-diazabicyclo[2.2.2]­octane = H<sub>2</sub>dabco). Meanwhile, structurally similar hybrid material (H<sub>2</sub>dabco)­Rb­[BF<sub>4</sub>]<sub>3</sub> was designed as a control. They exhibit similar phase-transition characteristics and dielectric response behaviors around 333 K. More interestingly, the ordered–disordered transformation of their organic “spherical” cations (H<sub>2</sub>dabco) was deemed to produce their phase transitions and dielectric response switching. Given its ability to generate a dielectric response, (H<sub>2</sub>dabco)­(NH<sub>4</sub>)­[BF<sub>4</sub>]<sub>3</sub> will show the potential application of metal-free perovskite in a future thermal sensing device.