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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 6
BKCSDE 27(6)
June 20, 2006 

 
Title
Spectrophotometric Study of the Interaction between Tetraethylammonium Halides and Aza-15-crown-5 with I2 and ICl in Acetonitrile Solution
Author
Abolfazl Semnani*, Hamid Reza Pouretedal, Mohammad Hossein Keshavarz
Keywords
Spectrophotometry, Aza-15-crown-5, Acetonitrile, Iodine monochloride, Iodine
Abstract
The interaction between tetraethylammonium chloride (TEACl) with ICl and tetraethylammonium iodide (TEAI) and aza-15-crown-5 (A15C5) with I2 and ICl have been examined spectrophotometrically in acetonitrile solution. The results of TEACl-ICl indicate the formation of ICl2- through equilibrium reaction. In the case of TEAI-I2 and A15C5-I2, the equilibrium formation of I3- is confirmed. The interaction of TEAI-ICl begins with the simultaneous production of I2 and ICl2- (at TEAI/ICl < 0.5) as well as continues with the simultaneous consumption of I2 and formation of I3- (at TEAI/ICl > 0.5). Similar behavior is also observed for A15C5-ICl system. However, the changes are seen at A15C5/ICl mole ratios less and more than 0.66. Several equations have been suggested for the formation of detected species. The formation constants of various reactions were evaluated from the computer fitting of the absorbance-mole ratio data. IR spectra of A15C5 and 1:1 A15C5:ICl or A15C5:I2 complexes are compared and the effect of complexation on absorption bands is discussed.
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