An indium-based organic-inorganic phase transition material (C₅H₁₆N₂)InBr₅ (1) was synthesized by the reaction of In₂O₃ and 2, 2-dimethyl-1, 3-propanediamine in excess hydrobromic acid solution. Differential scanning calorimetry (DSC) measurement reveals that 1 experiences a first-order structural phase transition at Curie temperature Tc = 176 K. A step-like dielectric anomaly was recorded at around phase transition temperature. Further the variable-temperature single crystal X-ray diffraction indicates that the order-disorder transition of (C₅H₁₆N₂)²⁺ cation is the main factor drove the phase transition, changing from the non-centrosymmetric (NCS) space group of P2₁2₁2₁ to centrosymmetric (CS) space group Pnma upon heating. This finding paves the avenue to design and explore dielectric switching materials based on In-based organic-inorganic hybrid compounds.

通过In ₂ O ₃与2，2-二甲基-1，3-丙二胺在过量的氢溴酸溶液中的反应合成了铟基有机-无机相变材料（C ₅ H ₁₆ N ₂）InBr ₅（1）。差示扫描量热法（DSC）测量表明1在居里温度Tc = 176 K处经历了一级结构相变。在相变温度附近记录了阶梯状介电异常。此外，温度可变的单晶X射线衍射表明（C ₅ H ₁₆ N ₂）的有序转变。²⁺阳离子是驱动相变的主要因素，加热时从P 2 ₁ 2 ₁ 2 _{1 1}的非中心对称（NCS）空间群变为P nma的中心对称（CS）空间群。该发现为基于In-基有机-无机杂化化合物的介电开关材料的设计和探索铺平了道路。