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2012 Vol.31, Issue 2 Preview Page
Ultrasonic Relaxation for Complexation Reaction Between β-Cyclodextrin and Butanoic Acid in Aqueous Solution
Jong-Rim Bae1*
1Department of Physics, Daegu University, Gyeongsan 712-714
*Corresponding Author
28 February 2012. pp. 100-106
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Abstract

The aim of this work was to reveal the effect of butanoic acid in its dissociated form and undissociated form as a guest molecule on the kinetic parameters in an inclusion reaction with β-cyclodextrin (β-CD). Ultrasonic absorption measurements in the frequency range from 0.2 to 45 MHz were carried out for β-CD solutions with butanoic acid at 25℃ by ultrasonic relaxation method. The rate and the equilibrium constants were obtained from the guest concentration dependence of the relaxation frequency, and the standard volume change of the complexation reaction were obtained from the maximum absorption per wavelength. A single relaxational absorption was observed, and the cause of the relaxation was attributed to a perturbation of the chemical equilibrium associated with a complexation reaction between β-CD and butanoic acid. These results were compared with those in solutions containing both β-CD and different guest molecules. It was found that the hydrophobicity of guest molecules played an important role in the formation of the inclusion complex and also that the charge on the carboxylic group had a considerable effect on the kinetic characteristics of the complexation reaction.

Keywords
Cyclodextrin
Butanoic acid
Inclusion complex
Hydrophobicity
Single relaxational absorption
Maximum absorption per wavelength
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 31
  • No :2
  • Pages :100-106
  • Received Date : 2011-11-21
  • Revised Date : 2012-01-16
  • Accepted Date : 2012-01-27
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