Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (12): 3672.doi: 10.7503/cjcu20210540

• Physical Chemistry • Previous Articles     Next Articles

Group Contribution Method for Infinite Dilution Molar Conductivity of Unconventional Ions in Water

WAN Ren, SONG Fan, PENG Changjun(), LIU Honglai   

  1. School of Chemistry and Molecular Engineering,East China University of Science and Technology,Shanghai 200237,China
  • Received:2021-07-30 Online:2021-12-10 Published:2021-09-13
  • Contact: PENG Changjun E-mail:cjpeng@ecust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22078086)

Abstract:

Unconventional ions refer to ions that have been appear with the continuous creation of ionic liquids(ILs), and their most attractive feature is that they can be designed. When ILs are in an infinite dilution state, the most important transfer property is the infinite dilution molar conductivity(λB)of a single ion, which reflects the solvation of the ion and is an important link between different transfer properties. The group contribution method(GCM)was established to predict the infinite dilution molar conductivity model(λB-GCM) of imidazole cations and quaternary ammonium cations, and obtain the contributions of the imidazole central ion[Im], alkylammonium[N], methyl[—CH3], methyl[—CH2—], ring hydrogen[ring-H], ether group [—O—], hydroxyl group[—OH] and other groups to the infinite dilution molar conductivity. The established λB-GCM can not only reflect the influence of different groups on the infinite dilution molar conductivity, but also reveal the relationship between the temperature and the infinite dilution molar conductivity. The results showed that more than 70% of data points predicted lnλB by GCM produced an absolute relative deviation of less than 2%, less than 1% of data points with an absolute relative deviation of more than 5% and the total average absolute relative deviation was 1.57%. Overall, λB-GCM is a simple and reliable method to predict the infinite dilution molar conductivity of unconventional cations.

Key words: Infinite dilution molar conductivity, Group contribution method, Unconventional ion, Ionic liquid

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