Chem. J. Chinese Universities ›› 2013, Vol. 34 ›› Issue (4): 853.doi: 10.7503/cjcu20120897

• Organic Chemistry • Previous Articles     Next Articles

Binding Thermodynamics of p-Sulfonatocalix[4]arene with Quaternary Ammonium Dications

LI Zhen-Quan1, HU Chun-Xiu2, CHENG Yu-Qiao1, XU Hui1, CAO Xu-Long1, SONG Xin-Wang1, ZHANG Heng-Yi2, LIU Yu2   

  1. 1. Geological Scientific Research Institute of Shengli Oilfield Company, SINOPEC, Dongying 257015, China;
    2. State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China
  • Received:2012-09-28 Online:2013-04-10 Published:2013-03-15

Abstract:

The stoichiometric ratio, binding modes, complex stability constants and thermodynamic parameters of p-sulfonatocalix[4]arene with three quaternary ammonium dication salts were studied in aqueous buffer solution(pH=7.20) by means of 1H NMR spectroscopy and microcalorimetrical titration. The results obtained from NMR experiments suggest the 1: 1 stoichiometric ratio with different binding modes between host and guest. The results of the microcalorimetrical titration show that the complex stability constants of p-sulfonatocalix[4]arene with three quaternary ammonium dication salts are more than 105 L/mol. Thermodynamically, the host-guest binding behavior are mainly driven by the favorable enthalpic changes, accompanied by the unfavorable entropic changes.

Key words: Quaternary ammonium dication, p-Sulfonatocalix[4]arene, Thermodynamics

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