苯对N,N-二甲基甲酰胺化合物1H NMR的影响研究

本文研究了N,N-二甲基甲酰胺(DMF)在四氯化碳和苯混合溶剂中的¹H NMR。观察到N,N-二甲基甲酰胺(DMF)分子中两个甲基和混合溶剂中苯的共振吸收峰的化学位移随苯的摩尔分数增加而逐渐移向高场,而且两个甲基共振吸收峰向高场移动的程度不同,α甲基较β甲基为甚。DMF分子中两个甲基和混合溶剂中苯的化学位移可以用线性方程表示(δ=A+Bx),这里x是混合溶剂中苯的摩尔分数。相关系数R接近于-1。

SOLVENT EFFECTS OF BENZENE ON THE 1H NMR OF N,N-DIMETHYL FORMAMIDE

This article deals with the ¹H NMR of N, N-dimethyl formamide (DMF) in a mixed solvent of benzene and carbon tetrachloride. It has been found that the chemical shifts of the resonance absorption lines of the two methyl groups in N, N-dimethyl formamide (DMF) and that of benzene in the mixed solvent move upficld gradually, as the mole fraction of benzene in the mixed solvent increases. And the rates of upficld shifts of the resonance absorption lines of the two methyl groups are different. △δ of α-CH₃ is larger than that of β-CH₃.The chemical shifts of the two methyl groups in DMF and benzene in the mixed solvent can be schemed with a linear equation (δ=A + BX), where X is the mole fraction of benzene in the mixed solvent. The correlation coefficients R are approximately equal to-1.