| Organic-inorganic hybrid optoelectronic materials,especially dielectric/ ferroelectric luminescent materials,combine dielectricity/ ferroelectricity with optical properties,which makes them have broader application prospects.In the current organic-inorganic hybrid materials,materials with dielectric/ ferroelectric and luminescent properties are relatively scarce.Based on this problem,we conducted cutting-edge exploration and achieved a series of research results.These achievements have taken a major step toward solving the problem of scarcity of raw materials for photovoltaic devices.Organic-inorganic hybrid dielectric and ferroelectric phase transition materials have drawn more and more interest due to their advantages of easy processability,environmental friendliness and simple synthesis.The traditional inorganic ferroelectric and dielectric materials have high hardness,poor mechanical strength and are difficult to be processed.In search of a new type of dielectric and ferroelectric materials,we have designed and synthesized a series of novel crystal materials,and studied their crystal structure,dielectric and fluorescent properties one by one.In this paper,wu used imidazole derivatives,amines containing phenyl and saturated diamines as raw materials.Then mixed up them with metal salts one by one to obtain fifteen new compounds: [C4H7N2]·[MnCl3?H2O?]?1?? [C4H7N2]6·[?Cd Cl3?H2O]6?2??[C4H7N2]2·[Zn Cl4]?3?? [C4H7N2]2·[?CdCl3?H2O]2?4?? [C4H7N2]·[SbCl4]?5??[C12H18N]2·[CdBr4]·2H2O?6?? [C7H10N]2·[ZnCl4]?7?? [C8H12NO]2·[ZnCl4]?8??[C8H12NO]3·[SbCl6]?9?? [C12H18N]·[CdCl3]?10?? [C6H18N2]·[CdI4]?11??[C8H22N2]·[Cd3Br8]?12?? [C4H14N2]·[SbCl5]?13?? [C8H18N]3·[Bi2Cl9]?14?? [C4H14N2]·[BiCl5]?15?.The crystal structure,dielectric and fluorescence properties of the fifteen compounds were tested.Compound 1 has a structural phase transition at low temperature and emits red fluorescence upon irradiation with a UV lamp.Its dielectric constant displayed bistability at low temperatures and has a high anisotropy.Variable temperature fluorescence measurements showed that the fluorescence intensity of compound 1 increased with decreasing temperature and also exhibited bistability near the transition point.Compound 8 is a rare blue-dielectric bistable multifunctional material.Its uniaxial film was prepared,and its dielectric constant and fluorescence intensity showed a stepwise change at low temperature.Both DSC and structural results further demonstrated that it undergone a structural phase transition at low temperature.The properties of other compounds had been tested separately,and they did not exhibit structural phase transitions. |
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