红外光谱法研究胺与几种溶质的缔合性质

室温下在3800—3000 cm~(-1)内测定了苯脓、N-甲基苯胺与正庚烷、四氯化碳、苯和甲苯二元混合稀溶液的红外光谱, 考察了溶剂对溶质特征红外光谱的影响。测定了苯胺、N-甲基苯胺与吡啶在四氯化碳中作用的红外光谱, 以及苯胺、N-甲基苯胺、三乙胺、三丁胺和吡啶与乙醇在四氯化碳中作用的红外光谱, 计算了相应的交叉缔合常数, 对不同种分子间的相互作用进行了探讨。几种含氮分子与乙醇缔合时, 给予电子的能力按以下次序递增: 苯胺～N-甲基苯胺<三丁胺<吡啶<三乙胺。此外, 还对乙醇+吡啶+氯仿三元体系的特征红外光谱随溶剂比例的变化进行了分析讨论。

A STUDY ON ASSOCIATION OF AMINE WITH SEVERAL SOLUTES BY INFRARED SPECTROMETRY

Infrared spectra of binary mixtures of aniline or N-methylaniline with n-heptane, carbon tetrachloride, benzene or toluene have been measured at room temperatures with an IR spectrometer. The solvent effect on the NH group stretching vibration frequencies were discussed. Infrared spectra of several mixtures containing a nitro-genous Lewis base in CCl_4. were also determined and the involved cross-association contants were calculated. The results indicate that aniline is a stronger proton donor than N-methylaniline when they associate with pyridine in CCl_4, and the protonaccepting ability of several bases increase in the order: aniline ～N-methylaniline