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Effect of diphenyl fullerene on UV absorptio
Time:2021-04-28 Size:[BigMediumSmall]
The quantitative relationship between structure and properties of organic compounds is of great theoretical significance and practical value. The electronic absorption spectra of organic conjugated systems are not only closely related to the molecular structure, but also affected by the chemical environment. As far as the UV absorption energy of dibenzo fullerene compounds is concerned, it is mainly affected by two factors: one is the internal structure of the molecule, that is, the properties of substituents; The second is the external environment of molecules, that is, the media around molecules, such as solvents. A large number of studies have been done on the influence of solvent effect on the UV absorption of organic compounds. The results show that in different solvents, some absorption wavelengths have a red shift, while others have a blue shift. The direction of the shift is related to the dipole moment states of the ground and excited states of the solute molecules, However, the size and direction of its movement can not be accurately predicted from the theoretical chemical book. At the same time, there are many parameters that can express the polarity of solvents. However, whether these parameters can be used to quantitatively study the variation of UV absorption energy of dibenzo fullerenes in different solvents. In fact, there are solute solvent interactions among dibenzofurane molecules in different solvents. The experimental results show that the UV absorption energy of the same solute molecule changes in different solvents. For example, the absorption wavelength of p-dpfome in THF and chlorobenzene is more than 17nm, which shows that the solvent effect is very obvious. Therefore, the solvent effect must be considered if we want to investigate the common law of the change of UV absorption energy of dibenzofurane molecules in various solvents.
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