Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
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Near-IR Spectroscopic Studies of the Hydrogen Bonding between Thioacetamide and N,N-Dimethylacetamide in $CCl_4$

$CCl_4$중에서 Thioacetamide와 N,N-Dimethylacetamide사이의 수소 결합에 관한 분광학적인 연구

  • Kang Bong Lee (Department of Chemistry, Korea University) ;
  • Byung-Chul Kim (Department of Chemistry, Korea University) ;
  • Chang-ju Yun (Department of Chemistry, Song-Sim College for Women) ;
  • O. D. Bonner (Department of Chemistry, University of South Carolina) ;
  • Young-Sang Choi (Department of Chemistry, Korea University)
  • 이강봉 (고려대학교 이과대학 화학과) ;
  • 김병철 (고려대학교 이과대학 화학과) ;
  • 윤창주 (성심여자대학 화학과) ;
  • ;
  • 최영상 (고려대학교 이과대학 화학과)
  • Published : 1986.12.20
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Abstract

Spectra for the $v_3$+ Amide II combination band of thioacetamide(TA) were obtained in carbon tetrachloride solutions and in very dilute solutions of TA-N,N-dimethlylacetamide (DMA) in carbon tetrachloride in the range of 5~55$^{\circ}$C. The combination band in the three component system can be resolved into components due to monomeric TA, 1 : 1 TA-DMA complex and 1 : 2 TA-DMA complex. In the dilute solutions the experimental spectrum was resolved by using the computer into its two Lorentzian-Gaussian product components which have been identified with the monomeric TA and the 1 : 1 complex. The equilibrium constants and thermodynamic parameters of 1 : 1 complex were determined by analysis of concentration and temperature dependent spectra. The ${\Delta}H^{\circ}$ and ${\Delta}S^{\circ}$ for the 1 : 1 complex were -14.4 KJ mol$^{-1}$ and -15.6 J mol$^{-1}deg^{-1}$, respectively.

Thioacetamide(TA)-CCl$_4$와 TA-N,N-dimethlylacetamide (DMA)-CCl$_4$ 용액에서 TA의 $v_3$ + Amide II 조합띠의 근적외선 스펙트럼을 5$^{\circ}$ ~55$^{\circ}$C 에서 얻었다. 삼성분계에서 이 조합띠는 단위체 TA, 1 : 1 TA-DMA complex and 1 : 2 TA-DMA 및 1 : 2 TA-DMA 성분으로 나타나지만, 묽은 용액에서는 단위체 TA와 1 : 1 복합체만이 나타나며 이를 컴퓨터를 사용해서 각 띠의 형태를 Lorentzian-Gaussian 곱의 함수로 보아 분리하였다. 농도 및 온도에 따른 스펙트럼을 분석하여 1 : 1복합체에 대한 평형상수와 열역학적 피라미터들을 구했으며, ${\Delta}H^{\circ}$는 -14.4 KJ mol$^{-1}$이었고 ${\Delta}S^{\circ}$는 -15.6 J mol$^{-1 }deg^{-1}$이었다.

Keywords

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