Organic–inorganic hybrid perovskites, with the formula ABX₃ (A=organic cation, B=metal cation, and X=halide; for example, CH₃NH₃PbI₃), have diverse and intriguing physical properties, such as semiconduction, phase transitions, and optical properties. Herein, a new ABX₃‐type semiconducting perovskite‐like hybrid, (hexamethyleneimine)PbBr₃ (1), consisting of one‐dimensional inorganic frameworks and cyclic organic cations, is reported. Notably, the inorganic moiety of 1 adopts a perovskite‐like architecture and forms infinite columns composed of face‐sharing PbBr₆ octahedra. Strikingly, the organic cation exhibits a highly flexible molecular configuration, which triggers an above‐room‐temperature phase transition, at T_c=338.8 K; this is confirmed by differential scanning calorimetry (DSC), specific heat capacity (C_p), and dielectric measurements. Further structural analysis reveals that the phase transition originates from the molecular configurational distortion of the organic cations coupled with small‐angle reorientation of the PbBr₆ octahedra inside the inorganic components. Moreover, temperature‐dependent conductivity and UV/Vis absorption measurements reveal that 1 also displays semiconducting behavior below T_c. It is believed that this work will pave a potential way to design multifeatured perovskite hybrids by utilizing cyclic organic amines.

中文翻译：

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[C6H14N] PbBr3：具有室温以上相变的ABX3型半导体钙钛矿杂化体

分子式为ABX _3的有机-无机杂化钙钛矿（A =有机阳离子，B =金属阳离子，X =卤化物；例如CH ₃ NH ₃ PbI ₃），具有多种多样且有趣的物理性质，例如半导体，相跃迁和光学特性。本文报道了一种由一维无机骨架和环状有机阳离子组成的新型ABX ₃型半导体钙钛矿样杂化体（六亚甲基亚胺）PbBr ₃（1）。值得注意的是，的无机部分1采用的钙钛矿等构成的结构和形式的无限列面共享PbBr ₆八面体。令人惊讶的是，有机阳离子在T _c = 338.8 K时表现出高度灵活的分子构型，从而触发了高于室温的相变；这可以通过差示扫描量热法（DSC），比热容（C _p）和介电常数测量得到证实。进一步的结构分析表明，相变源自有机阳离子的分子构型变形以及无机组分内部的PbBr ₆八面体的小角度重新取向。此外，温度相关的电导率和UV / Vis吸收测量结果表明，1还在T _c以下也表现出半导体行为。相信这项工作将为利用环状有机胺设计多功能钙钛矿杂化料铺平道路。