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以四氯化碳作为惰性参考溶剂,研究了N-甲基-2-吡咯烷酮(NMP)、环丁砜、N,N-二甲基甲酰胺(DMF)、N,N-二甲基乙酰胺(DMA)和γ-丁内酯(γ-BL)等五种萃取剂在几种芳烃溶剂中的~1H NMR谱。观察到萃取剂分子的化学位移在芳烃溶剂中均大幅度移向高场,且NMP、γ-BL的共振谱线在芳烃中发生分裂或重叠。在不同的芳烃溶剂中,以在苯乙烯中NMP、DMF、DMA、环丁砜共振谱线的移动幅度为最大。各萃取剂谱线位移的幅度随着苯环上甲基数目的增多而递减。结合溶液热力学的结果,推断出NMP等萃取剂和芳烃分子之间存在着弱化学作用。
The effects of N, N-dimethylformamide (DMF), N, N-dimethylacetamide (DMA) ) And γ-butyrolactone (γ-BL) and other five extractants in several aromatic hydrocarbon solvents ~ 1H NMR spectrum. It is observed that the chemical shifts of the extractant molecules shift to high fields in aromatic solvents, and the resonance lines of NMP and γ-BL split or overlap in aromatic hydrocarbons. In different aromatic solvents, the shift range of NMP, DMF, DMA and sulfolane in styrene is the largest. The amplitude of displacement of each extractant line decreases as the number of methyl groups on the benzene ring increases. Combined with the results of solution thermodynamics, it is concluded that there is a weak chemical interaction between extractants such as NMP and aromatic hydrocarbon molecules.