| As the photoelectric sensing technology is moving towards more and more intelligent and sensitive,the traditional phase transition materials with single nature can no longer meet the needs of the public.The switchable phase transition property should be combined with other properties(such as photoluminescence or second-order nonlinearity)in order to have a wider application prospect.From the current research status,such materials with multiple superior properties are relatively rare,and it is a major problem to design and construct such crystal structures.Based on this status,a series of compounds with organic cyclic quaternary ammonium salt,host-guest structure consisting of protonated ammonium and crown ether as the ligands have been successfully synthesized by us.In addition,the structures and properties of these compounds were thoroughly explored through various characterization methods.The thesis is mainly described from the following three parts:In the first part,with spiro ring structure as a ligand,the compounds are[(CH2)4N(CH2)5]2[Co Br4](compound 1),[(CH2)4N(CH2)5]2[Cd Br4](compound 2),[(CH2)4N(CH2)5]2[Zn Br4](compound 3).In the second part,with a host-guest structure composed of 2,2-dimethyl-1-propylamine and 18-crown-6 as a ligand,compounds are[(C5H14N)-(18-crown-6)][NO3][HNO3](compound 4),[(C5H14N)-(18-crown-6)][BF4](compound 5),[(C5H14N)-(18-crown-6)][Cl O4](compound 6).In the third part,with a host-guest structure composed of 2-chloroethylamine and 18-crown-6as a ligand,compounds are[(C2H7NCl)-(18-crown-6)][BF4](compound 7),[(C2H7NCl)-(18-crown-6)][Cl O4](compound 8),[(C2H7NCl)-(18-crown-6)][PF6](compound 9).In summary,a total of 9 compounds were studied in the thesis.These compounds were measured by various methods such as dielectric,DSC and single crystal structure measurement,etc.Among them,compound 2,3,5,6,8,9 have phase transition behavior and excellent performance,which make them suitable for manufacturing multi-functional switchable molecular materials. |
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