Physicochemical Properties Of Acetyl Amino Acid Ionic Liquids In Water Solution At Dilute Region

In recent years,with the in-depth research on ionic liquids,the development of ionic liquids has shown a trend of diversification.Its many advantages and designability make ionic liquids widely used in various fields.Since triazole and its derivatives are widely used in medicine and industry,triazole cations are introduced into the design of ionic liquids.Amino acids exist more in nature,and have better biocompatibility,degradability,and environmental friendliness,so acetyl amino acids are selected as anions.The introduction of water can make up for the shortcomings of pure ionic liquids to a certain extent,so as to increase the scope of their potential applications.This paper starts with the physical and chemical properties of two ionic liquids and dilute water solutions,and studies the derivative properties of the mixed system.While exploring the interaction between molecules and ions,it can also provide data and reference value for specific application scenarios.To this end,two kinds of ionic liquids:[Taz（2,4）][Acgly]and[Taz（2,4）][Acala]were prepared in this paper and formed dilute solution systems with water respectively.The possible interactions in the mixed system were explored and analyzed through the measurement of their physical and chemical properties and related calculations.The specific work is as follows:1.Two kinds of ionic liquids 1-ethyl-4-butyl-1,2,4-triazole acetylglycine（[Taz（2,4）][Acgly]）and 1-ethyl-4-Butyl-1,2,4-triazole acetylalanine（[Taz（2,4）][Acala]）with different anions were synthesized.Structural analysis was performed using hydrogen nuclear magnetic resonance spectrum（¹H NMR）and carbon nuclear magnetic resona nce spectrum(¹³C NMR).The results showed that the structure of the synthesized pro duct was consistent with that of the target ionic liquid.2.Dilute solutions of two ionic liquids with a molar concentration in the range of0.1000-1.0000 mol·kg^-1 were prepared using an electronic analytical balance and a 50m L wide-mouth plastic bottle.The density,viscosity,conductivity,surface tension and refraction were measured in the temperature range of 293.15 K～318.15 K.3.Based on the density data obtained from the above measurements,the volume properties of the mixed system were calculated:thermal expansion coefficient,average molar volume,excess molar volume;According to the viscosity and conductivity data obtained by the experiment,the transport properties of the mixed system were calculated:viscosity deviation,viscosity B coefficient,molar conductivity,Walden product;According to the surface tension obtained by the experiment,the surface properties of the mixed system were calculated:surface tension deviation,molar surface Gibbs free energy,molar surface entropy,molar surface enthalpy;according to the experimentally measured refractive index data,Based on the experimentally determined refractive index data,the refractive index properties of the mixed system were calculated:refractive index deviation and molar refractive index.