Synthesis And Liquid Properties Of Azobenzene Compounds Containing Dihydropyrazole

Dihydropyrazole compounds are a class of valuable heterocyclic compounds,which have been found in a wide variety of natural products and used in a variety of functional materials.Azo compounds have a large II electronic system and good liquid crystal properties.In this paper,we use aminoacetophenone and 1-(4-(4-hydroxyphenyl)diazenyl)phenyl)as a raw materials.After four synthetic steps,A series of dihydropyrazole compounds containing liquid crystallinity was obtained.the target products were characterized by IR(IR),nuclear magnetic resonance spectroscopy(13CNMR and 1HNMR),high resolution mass spectrometry(HRMS),ultra violet spectroscopy(UV),cyclic voltammetry(CV)and fluorescence spectroscopy.The liquid crystallinity of the films was studied by orthogonal polarizing microscope(POM)and differential scanning calorimetry(DSC).The results show that the compound having three aromatic ring without liquid crystal properties.However,the compound having four aromatic ring with liquid crystal properties.