Spectrophotometric study of the complexation of iodine with 1,7-diaza-15-crown-5 in chloroform solution

  • Abolfazl Semnani
  • Mojtaba Shamsipur


The complex formation reaction between iodine and 1,7-diaza-15-crown-5 (DA15C5) has been studied spectrophotometrically in chloroform at 25°C. The resulting 1:2 (DA15C5:I2) molecular complex was formulated as (DA15C5...;I+)I 3 . The spectrophotometric results, as well as the conductivity measurements, revealed that the gradual release of triiodide ion from its contact ion paired form in the molecular complex into the solution is the rate determining step of the reaction. The rate constant was calculated ask=(8.8±0.2)×10−3 min−1. The formation constant of the molecular complex was evaluated from the computer fitting of the absorbance-mole ratio data as logKf=6.89±0.09.

Key words

DA15C5-iodine complex stoichiometry stability rate constant spectrophotometry 


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Copyright information

© Kluwer Academic Publishers 1995

Authors and Affiliations

  • Abolfazl Semnani
    • 1
  • Mojtaba Shamsipur
    • 2
  1. 1.Department of ChemistryShiraz UnivesityShirazIran
  2. 2.Department of ChemistryRazt UniversityKermanshahIran

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