Design,Synthesis And The Study On Dielectric Properties Of Organic-inorganic Hybrid Crystals

Phase transition materials have broad application prospects in the fields of memory,capacitors,and sensors.Molecular organic-inorganic hybrid materials have the advantages of both organic and inorganic compounds,and are easy to control,flexible,and easy to process.They are useful supplements for inorganic phase change materials.In practical applications,organic-inorganic hybrid materials exhibit very good physical or chemical properties,making them a new research hotspot in the field of phase transition materials.In order to explore new phase transition materials,a series of novel molecular-based organic-inorganic hybrid compounds were synthesized based on 1,4-diazabicyclo（2.2.2）octane derivatives and N-oxy-quinuclidin.It performs crystal structure analysis,thermodynamic analysis,and dielectric property testing to determine if a structural phase transition occurs.1,4-Diazabicyclo（2.2.2）octane is a kind of"star"compound which is prone to conformational transformation or proton transfer due to its D_3h symmetry in the process of constructing phase transition material compounds..In this paper,based on 1,4-diazabicyclo（2.2.2）octane,the cation symmetry is reduced by the introduction of polar groups or the effective substitution of nitrogen and oxygen atoms.Compounds with phase transition behavior were obtained and its dielectric behavior is effectively measured.In this paper,11 compounds were synthesized and studied:[C₇H₁₆N₂]NH₄（BF₄）₃（1）,[C₇H₁₆N₂]NH₄（ReO₄）₃（2）,[C₇H₁₆N₂][CdCl₄]（3）,[C₇H₁₆N₂][MnBr₄]（4）,[C₆H₁₃N₂O][CdCl₄]（5）,[C₆H₁₃N₂O][CdBr₄]（6）,[C₆H₁₃N₂O][MnBr₄]（H₂O）（7）,[C₆H₁₃N₂O][BiCl₅]（8）,[C₇H₁₄NO][ClO₄]（9）,[C₆H₁₃N₂O][ClO₄]（10）,[C₆H₁₃N₂O₂][ClO₄]（11）.It was found that compounds 1,2 and 9 were subjected to dielectric and DSC tests and showed phase transition behavior under temperature stimulation.They are excellent phase transition materials.