Chemical Reaction Of Typical Organic Compounds Assisted By Carbon Disulfide Under High Pressure

The structure of the material determines its function.Pressure is one of the important thermodynamic parameters,and the structure of the material can be modulated by changing the external pressure.Diamond anvil cell is a mature pressurized equipment,combined with in situ spectroscopy technology,it is convenient to study the structure and performance changesofmaterialsunderdifferentexternalpressure conditions.Organic conjugated materials have unique photoelectric properties and broad application prospects.The study of the structural stability of organic conjugated materials under high pressure has certain guiding significance for the use conditions of materials and the strategies of organic chemical synthesis.In this paper,two typical organicconjugatedmaterials,?-caroteneandcyclohexane,were investigated for their compressive chemical stability in carbon disulfide solvent.?-carotene is one of the carotenoids,which is the most common and stable natural pigment in nature.In this paper,in situ high pressure Raman spectroscopy of the binary system of?-carotene and CS₂was studied using CS₂as solvent.With the increase of pressure,the Raman spectra of the binary system of?-carotene-CS₂move towards high wavenumber,which is due to the shortening of the length of molecule folding bond under pressure.The slope of frequency shift-pressure curve of pure?-carotene,pure CS₂and?-carotene-CS₂binary system was analyzed.It was found that the slope of all Raman lines of?-carotene-CS₂binary system was higher than that of pure?-carotene,indicating that CS₂had a certain assistant solvent pressurization effect.When the pressure increases to a certain value,a part of?-carotene will precipitate due to the effect of suppressing solvent.We also found that the relative intensity of Raman spectra of?-carotene in the binary system of?-carotene-CS₂was gradually weakened.This may be due to the chemical reaction of?-carotene,which was transformed into other chemicals under the pressure of CS₂assistant solvent.The high-pressure Raman spectra of cyclohexane-CS₂binary system at10.05 Gpa pressure were studied.It was found that with the increase of pressure,the Raman band intensity of cyclohexane-CS₂binary system decreased,and the band shifted to high wavenumber,that is,a blue shift occurs.Compared withthe highpressure Ramanspectra ofpure cyclohexane,the binary system of cyclohexane-CS₂has new broad peaks with disordered polymer characteristic around 1400cm^-1.The strength ratio of characteristic peaks of cyclohexane(801cm^-1)and CS₂(656cm^-1)in cyclohexane-CS₂binary system is linear with pressure,which further proves that CS₂can cause the polymerization of cyclohexane at high pressure,and the polymerization pressure is between 5 and 6 Gpa.The study of these two systems will give us a more comprehensive understanding of the properties of?-carotene and cyclohexane.CS₂can assist the chemical reaction of organic conjugated materials under high pressure,and some organic conjugated materials can be polymerized.This phenomenon has a certain guiding significance for the study of high-pressure polymerization,provides a new idea for high-pressure polymerization,and has a certain reference significance for the synthesis of polymers.