Acta Phys. -Chim. Sin. ›› 1994, Vol. 10 ›› Issue (06): 560-564.doi: 10.3866/PKU.WHXB19940615

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Study on the Complexation of N-(para-Substituted Phenyl) Nitrogen-Hetero-15-Crown-5 with Alkali Ions by Titration Calorimetry

Ma Yu-Xin, Lu Xiang-Sheng, Wang Lian-Shun, Chen Rong-Ti   

  1. Department of Chemistry, Nankai University, Tianjin 300071
  • Received:1993-02-22 Revised:1993-07-08 Published:1994-06-15
  • Contact: Chen Rong-Ti


The reactions between sodium iodide, potassium iodide and a series of N-(parasubstituted phenyl) nitrogen-hetero-15-crown-5 were studied by titration calorimetry at 25 ℃ in ethanol. It was found that the aza-crown ethers and the alkali metal ions form 1:1 complexes. The electron-donating substituent on the phenyl ring may enhance the ligation ability of the macrocyclic ligand. It was found that linear thermodynamic function relationships exist in the systems studied.

Key words: Titration calorimetry, Entropy titration, N-(psubstituted phenyl) nitrogen-hetero-15-crown-5, Linear free energy, Linear enthalpy relationships, Linear thermodynamic function relationships