引用本文:
王可玉, 郑国康, 陈铭之. 某些萃取剂与C6—C9芳烃相互作用的1H NMR研究[J]. 物理化学学报,
1986, 2(05): 432-436.
doi:
10.3866/PKU.WHXB19860507
Citation: Wang Keyu, Zheng Guokang, Cheng Mingzhi. THE 1H NMR STUDY OF MOLECULAR INTERACTIONS BETWEEN SOME EXTRACTING SOLVENTS AND C6—C9 AROMATIC HYDROCARBONS[J]. Acta Physico-Chimica Sinica, 1986, 2(05): 432-436. doi: 10.3866/PKU.WHXB19860507
Citation: Wang Keyu, Zheng Guokang, Cheng Mingzhi. THE 1H NMR STUDY OF MOLECULAR INTERACTIONS BETWEEN SOME EXTRACTING SOLVENTS AND C6—C9 AROMATIC HYDROCARBONS[J]. Acta Physico-Chimica Sinica, 1986, 2(05): 432-436. doi: 10.3866/PKU.WHXB19860507
某些萃取剂与C6—C9芳烃相互作用的1H NMR研究
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。
English
THE 1H NMR STUDY OF MOLECULAR INTERACTIONS BETWEEN SOME EXTRACTING SOLVENTS AND C6—C9 AROMATIC HYDROCARBONS
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.
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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