二乙酰一肟与苯相互作用的^1H核磁共振研究

Study on the Interactions Between Diacetyl Monoxime and Benzene by 1H NMR

研究二乙酰一肟在四氯化碳和苯混合溶剂中的１ＨＮＭＲ，观察到二乙酰一肟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甲基的Δδ值较β甲基的Δδ值为大。α甲基和混合溶剂中苯的化学位移与苯的摩尔分数呈线性关系，可用方程δ＝Ａｘ＋Ｂ表示，式中ｘ是混合溶剂中苯的摩尔分数，相关系数Ｒ接近于－１。

This article deals with the 1H NMR of diacetyl monoxime 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 diacetyl monoxime and that of benzene in the mixed solvent move upfield gradually, as the mole fraction of benzene in the mixed solvent increses. And the rates of upfield shifts of the resonance absorption lines of the two methyl groups are different. Δδ of α CH 3 is larger than that of β CH 3. The chemical shifts of α CH 3 and benzene in the mixed solvent have linear relations with the mole fraction of benzene. and can be showed with a equation (δ=Ax+B),Where x is the mole fraction of benzene in the mixed solvent. The correlation coefficients R are approximately equal to -1.