物理化学学报 >> 1986, Vol. 2 >> Issue (05): 432-436.doi: 10.3866/PKU.WHXB19860507

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某些萃取剂与C6—C9芳烃相互作用的1H NMR研究

王可玉; 郑国康; 陈铭之   

  1. 兰州大学化学系
  • 收稿日期:1985-05-13 修回日期:1986-01-23 发布日期:1986-10-15

THE 1H NMR STUDY OF MOLECULAR INTERACTIONS BETWEEN SOME EXTRACTING SOLVENTS AND C6—C9 AROMATIC HYDROCARBONS

Wang Keyu; Zheng Guokang; Cheng Mingzhi   

  1. Department of Chemistry; Lanzhou University; Lanzhou
  • Received:1985-05-13 Revised:1986-01-23 Published:1986-10-15

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摘要： 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。

Abstract: Using tetramethyl silicane (TMS) as an external reference, solvent effect on chemical shifts of five extracting solvents, N-methyl-2-pyrrolidone (NMP), sulfolane, N,N-dimethylformamide (DMF), N,N-dimethyl-acetamide (DMA), and γ-butyrolactone (γ-BL), has been investigated in C_6—C_9 aromatics relative to carbon tetrachloride at 60.0 MHz and 36 ℃.
In the aromatic solvents, it has been observed that signals of the extracting molecules shifted significantly to high field and the resonance lines of NMP and γ-BL were splited or overlapped. The upfield shifts of the molecules decrease as the number of methyl group on aromatic ring increases. The extent of upfield shift in styrene is the largest among C_6—C_9 aromatics for NMP, DMF, DMA, and sulfolane. Considering the thermodynamic results obtained previously, it can be deduced that weak chemical interactions between molecules of the extracting solvents and the aromatic hydrocarbons may be existent.

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