Synthesis,Fluorescence Properties And Establishment Of Spectral Analysis Method Of Hydrogen Sulfate N-octylpyridine Ionic Liquid

Ionic liquid is a unique compound,which has been extensively studied because of its excellent physical,chemical,and especially optical properties.The use of IR,UV and fluorescence spectroscopy can effectively analyze the properties of ionic liquids,help everyone better understand ionic liquids,and lay the foundation for their development in other fields.In this paper,intermediates[OP]Br and ionic liquid[OP]HSO₄were synthesized,their structures were characterized by IR,and their characteristic peaks were analyzed to confirm that the target product had been synthesized.Compare the IR spectra of[OP]HSO₄in three different solvents:acetonitrile,ethanol,and n-butanol.Use the least square method to draw the slope of each wave number,the square of the slope,and the square of the correlation coefficient to find the best quantitative analysis peak,Draw a standard working curve,and measure the recovery rate of standard addition of[OP]HSO₄.Compare the UV spectra of[OP]HSO₄in three different solvents:acetonitrile,n-butanol,and water,determine the location of its maximum absorption wavelength,and plot the concentration at the maximum absorption wavelength in the range of4mg/L～400mg/L[OP]HSO₄absorbance linear range curve,find the concentration interval with good linear range for quantitative analysis,draw a standard working curve,and measure the recovery rate of[OP]HSO₄.Finally,this article analyzes the influence of single solvent,mixed solvent,concentration,and temperature on the fluorescence intensity of[OP]HSO₄,and measures the degree of light fading resistance and fluorescence quantum yield of[OP]HSO₄.It is found that the position of the maximum emission wavelength and the fluorescence intensity of[OP]HSO₄in four single solvents of water,methanol,ethanol,and acetonitrile are all related to the polarity of the solvent.And in the water-acetonitrile,water-ethanol,water-methanol mixed system,the fluorescence intensity of[OP]HSO₄is within a certain range,and increases with the increase in the volume fraction of organic solvents acetonitrile,ethanol,and methanol.After exceeding a certain range,The fluorescence intensity of[OP]HSO₄decreases with the increase of the organic solvent volume fraction.When the concentration of[OP]HSO₄in water and acetonitrile is small,the fluorescence intensity is proportional to the concentration.When the concentration is large,it is not linear,and if you continue to increase the concentration,the fluorescence intensity will decrease.At the same time,it is found that temperature also has an effect on the fluorescence intensity of[OP]HSO₄in water and acetonitrile.Increasing the temperature will also reduce the fluorescence intensity.Finally,after scanning the[OP]HSO₄aqueous solution for 40times under the maximum excitation state,it is found that the fluorescence intensity is slightly damaged,and the light fading phenomenon is not obvious,indicating that[OP]HSO₄has good light fading resistance,and it is calculated that[OP]HSO₄is in The fluorescence quantum yield in ethanol is about 0.46.