物理化学学报 >> 1991, Vol. 7 >> Issue (01): 49-56.doi: 10.3866/PKU.WHXB19910108

研究论文 上一篇    下一篇

某些Lewis碱与CCl4和CHCl3在298.15K的过量体积

龚桦; 姜永基; 王贻; 陈铭之; 郑国康   

  1. 兰州大学化学系
  • 收稿日期:1989-09-23 修回日期:1990-04-05 发布日期:1991-02-15
  • 通讯作者: 龚桦

Excess Volumes for (Tetrachlorloromethane+Lewis Bases) and for (Trichloromethane+Lewis Bases)

Gong Hua; Jiang Yong-Ji; Wang Yi; Chen Ming-Zhi; Zheng Guo-Kang   

  1. Department of Chemistry, Lanzhou University, Lanzhou
  • Received:1989-09-23 Revised:1990-04-05 Published:1991-02-15
  • Contact: Gong Hua

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摘要： 在298.15 K下用连续稀释膨胀计或振动管密度计测量了二甲基甲酰胺(DMF)、二甲基乙酰胺(DMA)、N-甲基吡咯烷酮(NMP)、γ-丁内酯(γ-BL)、二甲基亚砜(DMSO)分别与四氯化碳和三氯甲烷构成的二元系的过量体积。除DMSO+CHCl_2二元系的V~(E-x)曲线为S形外, 其余二元系的V~E值均为负值。在所研究的两个系列中, |V_(min)~E|的大小顺序均为:
NMP>γ-BL>DMF≈DMA>DMSO

关键词: 路易斯碱, 四氯化碳, 三氯甲烷, 过量体积, 连续稀释膨胀计

Abstract: Excess volumes have been measured by means of a continuous dilution dilatometer or a vibrational tube densimeter for both tetrachloromethane and trichloromethane+N,N-dimethylformamide (DMF), +N,N-dimethylacetamide (DMA), +N-methylpyrrolidone(NMP), +γ-butyroIactone(γ-BL) , +dimethysulfoxide(DMSO), at 298.15 K V~E values are negative over the entire range of composition for all systems except (trichloromethane + dimethylsulfoxide) which exhibits a sigmoid curve with negative values in the trichloromethane rich region. |V_(min)~E| values of the two series decrease in the order NMP>γ-BL>DMF≈DMA?DMSO. The results are interpreted in terms of forming charge-transfer complexes between tetrachloromethane and Lewis bases, and forming hydrogen-bonding associations between trichloromethane and Lewis bases respectively.

Key words: Lewis bases, Tetrachloromethane, Trichloromethane, Excess volumes, Continuous dilution dilatometer