| Since the 21st century,with the development of 5G and the Internet of Things,higher requirements have been placed on physical materials,especially smart materials.Functional phase transition materials,as an important part of smart materials,are used in sensors,actuators,shock absorbers,and visualized temperatures sensors and other device fields show potential application prospects.Through the targeted screening and accurate design of small organic molecules,many research groups have achieved major breakthroughs in properties.The proposed theoretical models of directional molecular design such as the"TOF effect"and"quasi-spherical theory"also provide researchers with a theoretical basis.Based on the current status of molecular phase transition research,we screened relatively less researched sulfur-containing organic salts and planar small molecules dimetridazole as organic ligands,and synthesized a series of potential functional phases through crystal engineering design.Through the study of crystal structure and dielectric properties,the inherent relationship between the crystal microstructure and macroscopic properties is explored.The paper research body is divided into three parts.The first part is the synthesis of[(CH3)3S]3·[Bi2Cl9](1),[(CH3)3S]3·[Bi2Br9](2)two non-ferroelectric piezoelectric compounds with good piezoelectric properties.The second part is based on trimethylsulfide and metal bromide as the matrix.[(CH3)3S]2·[Cd Br4](3),[(CH3)3S]2·[Mn Br4](4),[(CH3)3S]2·[Zn Br4](5)Three organic-inorganic hybrid dielectric and nonlinear optical bifunctional bistable phase switch materials.In the third part,a hybrid compound of planar small molecule dimetridazole and metal chloride was synthesized[C5H7N3O2]·[Zn Cl3](6),[C5H7N3O2]·[Cd4Cl9](7),[C5H7N3O2]·[Sn Cl6](8),and the crystal structures and dielectric properties of these three compounds were characterized,and studied whether the structural phase transition exists. |
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