| The organic-inorganic hybrid materials show excellent performance in multiple aspects such as light,electricity,heat,force and magnetism due to the combination of properties of organic and inorganic components.They provide a new platform for exploring new physics and applications.The crystalline organic-inorganic hybrid material is a special type of hybrid material,and its structure can be characterized using X-ray or neutron diffraction techniques.It allows the researchers to understand the relationship between their microstructure and performance deeply,which enables the possibility of accurate design of functional materials.In this paper,a series of crystalline organic-inorganic hybrid compounds were designed and synthesized via the strategy of precise molecular modification,and their crystal structure,thermodynamic properties,dielectric properties and other physical properties were characterized.This work is divided into three parts:In the first part:based on N,N-dimethylethylamine,using N,N-dimethylethylamine as a templated organic amine cation,through the introduction of halogen（F,Cl）and amino（-NH2）.The organic cation is hybridized with the inorganic framework constructed by CdCl2,and 4 crystalline organic-inorganic hybrid perovskite compounds were designed and synthesized:[（CH3）2NHCH2CH3][CdCl3]（1）,[（CH3）2NHCH2CH2F][CdCl3]（2）,[（CH3）2NHCH2CH2Cl]2[Cd2Cl6]（3）,[（CH3）2NHCH2CH2-NH3]2[Cd3Cl10]（4）.In the second part:The analogs of N,N-dimethylethylamine as organic amine cations,hybridizing with the inorganic framework constructed by CdCl2or CdBr2,4 crystalline organic-inorganic hybrid perovskite compounds were designed and synthesised:[（CH3）2NHCH（CH3）2][CdBr3]（5）,[（CH3）2NHC（CH3）3][CdCl3]（6）,[（CH3）3NC（CH3）3][CdCl3]（7）,[CH3NH2CH（CH3）2]2[Cd2Cl6]（8）.In the third part,we use demethyltropinone（8-azabicyclo[3,2,1]oct-3-one）as an organic cation hybridize with an inorganic framework constructed with different metal halides（CdCl2,Mn Cl2,Bi Cl3,Pb Br2）to design and synthesize 4 organic-inorganic hybrid:[C7H12NO][CdCl3]（9）,[C7H12NO]2[Mn Cl4]（10）,[C7H12NO]4[Bi2Cl10]（11）,[C7H12NO]4[Pb3Br10]（12）.Systematic characterizations reveal that compounds 1,7,and 12 have undergone structural phase transition within the measured temperature range.Among them,compound 1showed obvious dielectric relaxation at 210 K to 350 K,and compounds 7 and 12 showed obvious"step-like"anomalies near 350 K and 400 K,respectively.In addition,compound 12exhibits light-emitting and semiconductor properties,which may have application prospects in the field of multifunctional materials. |
PDF Full Text Request