丙氨酸离子液体[C4mim][Ala]的热化学性质  

Studies on the Thermo-Chemical Properties of Ionic Liquid Based on Alanine[C_4mim][Ala]

作　　者：佟静[1] 孙迎春[2] 房大维[1] 杨家振[1] 

机构地区：[1]绿色合成与先进材料制备化学辽宁省高校重点实验室,辽宁大学化学学院,沈阳110036 [2]沈阳工业大学石油化工学院,辽阳111003

出　　处：《高等学校化学学报》2009年第6期1210-1213,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:20773056);辽宁省教育厅基金(批准号:20063059,20063060)资助

摘　　要：在298.15 K下利用恒温环境溶解热量计测定了一系列含有已知微量水的1-丁基-3-甲基咪唑丙氨酸盐([C4mim][Ala])离子液体(IL)不同浓度样品的摩尔溶解焓.借助Debye-Hückel极限项,用外推法确定了不同含水量的[C4mim][Ala]样品的标准摩尔溶解焓[ΔsH m—0(wc)].随着样品中水含量的增加,ΔsH m—0(wc)的绝对值下降,将ΔsH m—0(wc)对含水量作图得到很好的直线,其截距ΔsH m—0(pure IL)=-60.74 kJ/mol,可看作是不含水的[C4mim][Ala]标准摩尔溶解焓的估算值.利用精密氧弹热量计测定了[C4mim][Ala]的燃烧热,计算得到其标准摩尔生成焓ΔfHm—0=(-675±11)kJ/mol.The enthalpies of solution of the ionic liquid （IL） based on alanine 1-butyl-3-methylimidazoliam alanine （ [ C4mim] [Ala] ）, with various amount of water, △solHm（wc） （wc） was measured over a molality range of about 0. 01-0. 06 mol/kg by the solution-reaction isoperibol calorimeter at 298.15 K. According to Archer＇s method, the standard molar enthalpies of solution of [ Cgmim] [ Ala ] with a known amounts of water, △sHm^θ（wc） were obtained. Plotting △sHm^θ（wc） against water content （w2）, was carried out, a good straight line was obtained and the intercept was the standard molar enthalpy of solution of [ C4mim] [ Ala] without water,△sHm^θ（wc） （ pure IL） = △sHm^θ（wc） （ pure IL） = - 60. 74 kJ/mol. Using an oxygen-bomb combustion calorimeter, the molar combustion enthalpy of [ C4mim] [ Ala] was determined at 298. 15 K and the standard molar formation enthalpy of [ C4 mim ] [ Ala ], △sHm^θ（wc） = （ - 675 ± 11 ） kJ/mol, was obtained.

关 键 词：丙氨酸 离子液体 溶解焓 生成焓 

分 类 号：O642[理学—物理化学]