| In recent decades,phase-change materials have attracted intense attention due to their rich properties in applications such as artificial intelligence,information storage,and sensing.Under stimuli such as light,temperature,and electric field,dielectric-responsive materials have bistable switches between high and low dielectric states,which can be used for intelligent control,communication,and optoelectronic switching.Current research mainly focuses on organic molecules or organic-inorganic hybrid materials.Organic-inorganic hybrid materials combine the properties of organic and inorganic components and have some outstanding features,such as structural diversity,simple synthetic strategies,tunable structures,and environmental friendliness.In this context,the development and design of multi-functional and multi-channel responsive materials is of great significance to the theoretical research and application of dielectric materials.In this paper,nine organic-inorganic hybrid compounds were successfully designed and synthesized,and their single crystal structures and dielectric properties were characterized by various measurement methods.Molecular structure design is one of the effective ways to find new high-performance phase change materials.The experimental research content of this paper is mainly divided into three parts.The first part is organic-inorganic hybrid compounds based on 3-bromopropyltrimethylammonium cation.By adjusting halogen anions or metal cations,four compounds were designed and synthesized,including[C6H15NBr]2[Cd Br4]（compound 1）,[C6H15NBr]2[Cd Cl4]（compound 2）,[C6H15NBr]2[Mn Br4]（compound 3）,[C6H15NBr]2[Mn Cl4]（compound 4）,which regulated the phase transition temperature and produced photoluminescence.The second part is based on the host-guest inclusion complex formed by difluoroethylamine cation and 18-crown-6.Two compounds were synthesized in different solvents,including[（F2CHCH2NH3）-（18-crown-6）][PF6]·CH3CN（compound 5）,[（F2CHCH2NH3）-（18-crown-6）][PF6]（compound 6）,and through the solvent-induced effect,the dielectric switch was triggered.The third part is organic-inorganic hybrid materials based on Dabco derivatives.By modifying Dabco and coordinating with different anions and cations,three compounds were synthesized,including[C11H22N2][Mn Br4]（compound 7）,[C11H22N2][Cu Cl4]（compound 8）,[C11H22N2][Zn Br4]（compound 9）.As mentioned above,nine compounds were synthesized in this paper,and the structure and properties of these nine compounds were studied and analyzed by various characterization methods such as dielectric testing,differential scanning calorimetry,temperature-variable single crystal X-ray diffraction.Studies have shown that compounds 1,2,3,4,and 5 all have clear dielectric phase transitions,and compounds 3,4,and 7 have photoluminescence.Among them,compounds 1,2,3,and 4are dual-phase transition materials with two consecutive dielectric responses,with bistable dielectric switches.Adjusting the halogen anion or metal cation changes the phase transition temperature and produces the photoluminescence phenomenon.In addition,the solvent-induced effect is also one of the ways to explore high-performance phase change materials.Therefore,the nine compounds provide reference value for the synthesis and characteristic research of high-performance dielectric materials. |
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