水溶液中乙酰胺与甲基吡啶异构体的焓相互作用  

The study of the Enthalpic Interactions between Acetamide and Picoline Isomer in Aqueous Solutions

作　　者：郑晓雯[1] 

机构地区：[1]济宁学院化学系,山东曲阜273155

出　　处：《济宁学院学报》2008年第6期44-47,共4页Journal of Jining University

摘　　要：利用2277热活性检测仪的流动测量系统测定了298.15K时,乙酰胺与三种甲基吡啶异构体在水溶液中混合过程焓变以及各自的稀释焓,根据M cM illan-M ayer理论关联得到了各级焓作用系数。三种异构体分子亲水和疏水基团的数目是相等的,只是位置不同,但溶质-溶质相互作用理论及基团贡献法理论都无法解释空间异构所造成的热效应的差异。而通过理论计算分别得到其最稳定的氢键络合物和结合能,通过对络合物空间构型及键角、键长的分析很好地解释了热效应的不同。The enthalpies of mixing of acetamide and three kinds of Picoline isomers have been determined at 298.15K by flow microcalorimetric system of 2277 Thermal Activity Monitor when mixing or diluting in aque- ous solution. Although these three isomers have the same number of hydrophilic and hydrophobic groups and only the different position, both solute -solute interactions theory and SWAG theory can not explain the heat effect difference of acetamide and Picoline isomers. But the theoretical calculation can do this, the analysis of the structure, bond angle and bond length of the hydrogen bond complexes can well explain the difference of heat effect.

关 键 词：酰胺 甲基吡啶 焓对作用系数 结合能 

分 类 号：O642.3[理学—物理化学]