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螺环季铵盐类有机-无机杂化化合物的介电性质研究
Studies on Dielectric Properties of Spirocyclic Quaternary Ammonium Organic-inorganic Hybrid Compounds
【作者】 王佳；
【作者基本信息】 东南大学 ， 环境化工（专业学位）， 2021， 硕士
【摘要】 近年来,可切换相变材料作为一种新型功能材料引起了人们的广泛关注。有机-无机分子基杂化化合物因其具有合成简单、结构可调、环保、轻柔等优良特性,成为了制备相变材料的最佳选择,在数据存储、信号处理、压电传感等方面具有非常广泛的应用。然而,设计具有高相变温度的介电开关材料仍然是一个较大的挑战。在本论文中,我们通过调节分子结构与堆积模式,设计并合成了一系列以螺环季铵盐为阳离子,金属卤化物为阴离子的有机-无机杂化化合物。通过多种表征方法进一步探究物质的结构、介电相变特性是否发生以及相变的温度。本论文主要从以下三个部分进行阐述:第一部分,以螺环哌啶季铵盐为阳离子的杂化化合物,分别是[C10H20N]2[Cd Cl4]（化合物1）、[C10H20N]2[Mn Cl4]（化合物2）、[C10H20N]2[Zn Br4]（化合物3）、[C10H20N]2[Mn Br4]（化合物4）。第二部分,以螺环吗啉季铵盐为阳离子的杂化化合物,分别是[C8H16NO]2[Cd Br4]（化合物5）、[C8H16NO]2[Mn Br4]（化合物6）、[C8H16NO]3[Bi2Cl9]2（化合物7）。第三部分,以螺环吗啉衍生物季铵盐为阳离子的杂化化合物,分别是[C10H20NO]2[Cd Br4]（化合物8）、[C10H20NO]2[Zn Br4]（化合物9）、[C10H20NO]2[Mn Br4]（化合物10）。研究表明,以螺环哌啶季铵盐为阳离子的杂化化合物1-4均发生了高温相变,表现出非常优异的双稳态介电开关特性。此外,通过调节金属与卤素原子的阴离子组合,可以调控化合物的相变温度。这一发现为寻找高性能的相变材料提供了有效途径。
【Abstract】 In recent years,switchable phase transition materials have aroused widespread attention as new functional materials.Organic-inorganic molecular-based hybrid compounds are the most suitable choices for preparing phase transition materials on account of their simple synthesis,adjustable structure,environmental protection,and flexibility,which makes them widely applied in data storage,signal processing,piezoelectric sensing,etc.However,designing switchable dielectric materials with high phase transition temperature is still a huge challenge.In this thesis,we designed and synthesized a series of organic-inorganic hybrid compounds with spirocyclic quaternary ammonium salts as cations and metal halides as anions by adjusting their molecular structures and molecular packing modes.A series of characterization methods were conducted to furture explore the structure of these compounds,whether the dielectric phase transitions occurred and the temperature of the phase transitions.This thesis is elaborated mainly from the following three sections:The first part expounds the hybrid compounds with spirocyclic piperidine quaternary ammonium salt as the cations,including[C10H20N]2[Cd Cl4]（compound 1）,[C10H20N]2[Mn Cl4]（compound 2）,[C10H20N]2[Zn Br4]（compound 3）,and[C10H20N]2[Mn Br4]（compound 4）.The second part states the hybrid compounds with spirocyclic morpholine quaternary ammonium salt as the cations,containing[C8H16NO]2[Cd Br4]（compound 5）,[C8H16NO]2[Mn Br4]（compound 6）,and[C8H16NO]3[Bi2Cl9]2（compound 7）.The third part describes the hybrid compounds with spirocyclic morpholine derivative quaternary ammonium salt as the cations,including[C10H20NO]2[Cd Br4]（compound 8）,[C10H20NO]2[Zn Br4]（compound 9）,and[C10H20NO]2[Mn Br4]（compound 10）.Results show that hybrid compounds 1-4 with spirocyclic piperidine quaternary ammonium salts as cations have undergone high-temperature phase transitions,exhibiting excellent bistable dielectric switching characteristics.In addition,by modulating the anion combinations of the metal and halogen atoms,the phase transition temperature of the compounds can be adjusted.This discovery provides a new trail to discover high-performance phase transition materials.
【Key words】 spirocyclic quaternary ammonium salt； organic-inorganic hybrid； phase transition material； single crystal structure；