Dielectric Response Behavior and Displacement‐Type Metal‐Free Organic‐Inorganic Hybrid Phase Transition Material: trans‐(NH₃C₆H₁₀NH₃)[NO₃]₂

Abstract

Phase transition compounds have been attracting interest in scientific research due to their wide applications in dielectric materials. Herein, a new displacement-type metal-free organicinorganic hybrid phase transition material trans-(NH 3 C 6 H 10 NH 3 )[NO 3 ] 2 (1) with T c = 245 K has been successfully synthesized. The single-crystal X-ray diffraction elucidates that the space group of 1 turns from P1 in the high temperature phase to P2 1 /c in the low temperature phase. And the reason of phase transition is related to the displacements of trans-(NH 3 C 6 H 10 NH 3 ) 2 + cations and [NO 3 ] À anions. In addition, 1 shows a dielectric anomaly around the T c . We expect that this finding will contribute to the research of displacement-type metal-free phase transition materials.

Two In-based Hybrid Compounds with Structural Phase Transitions Caused by Displacement Motion or Dynamic Disorder

“…Furthermore, [TEACCl] 2 CuBr 4 (TEACCl = (CH 3 CH 2 ) 3 NCH 2 Cl + ), a one-dimensional (1D) perovskite with T p = 315.8 K, was successfully designed by Cai et al, whose phase transition primarily stemmed from a disorder–order transformation of the [TEACCl] + cations . Displacive-type phase transition compounds have also been studied in recent years. , (NH 3 C 6 H 10 NH 3 )­[NO 3 ] 2 , a first-order phase transition compound with T p = 245 K, was successfully reported by Xu et al The displacement between the trans-(NH 3 C 6 H 10 NH 3 ) 2+ cation and [NO 3 ] − anion is the main driving force of the phase transition . A new displacive phase transition compound, [BrCH 2 CH 2 N­(CH 3 ) 3 ] 2 [CuBr 4 ] ( T p = 356 K), has been synthesized by Sui et al; the phase transition is triggered by a piston-like displacement motion of the Cu atom .…”