Syntheses And Physicochemical Properties Of Ether Functional Glycine Ionic Liquid

Ionic liquid as the new green solvent of 21 th century,rely on the advantages of have no pollution to the environment,so it be widely used in the chemical catalytic production.On account of the strong point favourable thermostability,degradability,and the synthetic method is very simpleness.Many of scientists have pay attention to the ionic liquid.Firstly,One imidazole intermediate [MOEMIM]Br?MOEMIM= 1-methoxy ethyl-3-methy limidazolium bromide?were synthesized.secondly,according to the ionic exchange method product the [MOEMIM]OH.Finally,the ether functional ionic liquid [MOEMIM][Gly]?[MOEMIM]=1-methoxyethyl-3-methylimidazolium glycine?were synthesized by the method of neutralization.And characterized by 1H NMR and DSC,it can be proved that is target material.It is difficult to remove trace water in ionic liquid.For the sake of eliminate the interference of small amount of waterin the ether functional ionic liquid[MOEMIM][Gly],we adopt the standard addition method?SAM?.The values of their conductivity and viscosity physical and chemical propertieswere getted within the specified range of?298.15 to 338.15 ± 0.01?K,each interval 5 K is a temperature measuring point,the theoretical value of five physical and chemical properties of the ether functionalized ionic liquid [MOEMIM][Gly] with zero water was obtained by extrapolation method at the same time of 298.15 K.Room temperature lattice energy and standard entropy can be obtained according to Krossing and Glasser's theory.The enthalpy of vaporization of[MOEMIM][Gly]??35?lgHm0?at room temperature was calculated by Kabo and Rebelo method in?298.15 K?.using the measured refractive index value,we can calculate the[MOEMIM][Gly] polarizability and molar polarization of ionic liquid.On the basis of the gap theory model model,the thermal expansion coefficient a of ether functionalized ionic liquid?[MOEMIM][Gly]?,were calculated and in comparison with experimental values,their magnitude orders are in good agreement.The Arrhenius and VFT equations were used to analyze the temperature of[MOEMIM][Gly] and conductivity and viscosity,the conductance activation energy and molar conductivity of [MOEMIM][Gly] were obtained.The diffusion coefficient of [MOEMIM][Gly] is calculated by the Nernst equation.[MOEMIM][Gly] viscous flow activation Gibbs free energy ?G? and Eyring according to the formula,using the?G? to estimate the viscous flow activation energy of [MOEMIM][Gly],and the Arrhenius equation to calculate the values compared with each other and have a good agreement.A solution-reaction isoperibol calorimeter?SRC-100?was used to determine the molar enthalpies of solution for different molalities of the[MOEMIM][Gly] within the specified range of?288.15 to 308.15 ± 0.05?K,each interval 5 K is a temperature measuring point.According to the theory of Archer and Debye-Hückel theoretical limit formula,Y extrapolation function calculated value and the concentration of linear fitting by different concentration and dissolution enthalpy value,the intercept of a certain temperature of the substance of infinite dilution standard molar enthalpy of ?_solH_m^?,while the relative apparent molar enthalpy of ^?L_B was also calculated in the temperatures.According to the lattice energy of ionic liquid[MOEMIM][Gly] and the standard molar enthalpy of dissolution of infinite dilution,the hydration enthalpy of ionic liquid??H₊+?H_–?was calculated.According to the values of standard molar enthalpies of solution,?solHm?,in infinite dilution aqueous and lattice energy,UPOT.Plotting the experimental values of ?solHm? for IL against?T-298.15?K,a good stright line was obtained.The intercept is the standard molar heat capacity of ionic liquids.According to Paulechka et al,molar heat capacity,Cp,of IL can be estimated with the molar volume?V?.