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2017 Vol.36, Issue 6 Preview Page
Ultrasonic relaxation associated with the complex formation of benzoic acid derivative and β-cyclodextrin

벤조산 유도체와 베타 사이클로덱스트린의 복합체 형성반응에 의한 초음파 완화

Shin Park1
,
Jongrim Bae2*
박 신1
,
배 종림2*
2Department of Physics, Daegu University
1대구대학교 생명환경학부
2대구대학교 물리학과
*교신저자. *Corresponding Author. 
30 November 2017. pp. 387-393
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Abstract

The dynamic interactions between benzoic acid derivative (pH ≈ 7.0)(guest) and β-cyclodextrin(β-CD)(host) were investigated in an aqueous solutions in terms of ultrasonic absorption in the frequency range 0.2 MHz ~ 50 MHz with emphasis on the low-frequency range below 1 MHz at 25 °C. We show that the interaction of β-CD and benzoic acid derivative complies with a typical spectrum of a single relaxation process around a few MHz. The ultrasonic relaxation observed in these solutions was due to a perturbation of a chemical equilibrium related to a reaction of an inclusion complex formed by the host and guest. The rate constant () and equilibrium constant () were determined from the concentration dependences of benzoic acid on the relaxation frequency. The standard volume change () of the reaction was also computed from the maximum absorption per wavelength. It was found that the hydrophobicity of guest molecules played an important role in the formation of the inclusion complex.

Keywords
β-CD (β-cyclodextrin)
Benzoic acid derivative
Inclusion complex
Ultrasonic relaxation
Hydrophobicity

베타 사이클로덱스트린(β-Cyclodextrin, β-CD)(호스트)과 벤조산 유도체(게스트)의 수용액에 대하여 25 °C,광대역 주파수영역(0.2 MHz ~ 50 MHz)에서 초음파 흡수계수를 측정하여 호스트와 게스트의 복합체 형성반응의 속도론적 연구를 행하였다. 특히 본 연구에서는 1 MHz 이하의 초음파 흡수측정이 중요하다. β-CD와 벤조산 유도체의 상호작용에 의한 초음파 완화는 수 MHz영역에서 단일 완화현상의 전형적인 스펙트럼을 보였다. 단일완화현상의 원인은 β-CD와 벤조산 유도체의 복합체 형성반응에 의한 화학평행의 혼란상태에 의한 것으로 해석하였다. 게스트 농도에 따른 완화주파수의 의존성으로부터 붕괴 속도상수(), 평형상수()를 결정하였다. 그리고 파장당 최대흡수치의 의존성으로부터 반응에 의한 표준체적변화 ()를 구하였다. 또한 게스트 분자의 소수성 그룹이 복합체의 안정성에 중요한 역할을 하는 것을 알았다.

키워드
베타 사이클로덱스트린(β-Cyclodextrin, β-CD)
벤조산 유도체
복합체 형성반응
초음파 완화
소수성
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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 : 36
  • No :6
  • Pages :387-393
  • Received Date : 2017-09-15
  • Revised Date : 2017-10-13
  • Accepted Date : 2017-11-29
  • DOI :https://doi.org/10.7776/ASK.2017.36.6.387
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