Journal of the Korean Chemical Society (대한화학회지)

Korean Chemical Society (대한화학회)
권호 표지

Reorientational Motion of N-Ethylacetamide in n-Alcohols

알코올 용액에서의 N-에틸아세트아미드의 재배향 운동

  • Published : 1993.01.20
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Abstract

The $^1H-NMR$ spectra of the NH-group were obtained for N-ethylacetamide (NEAA) in the series of n-alcohols over a temperature range of 310∼350K by using NMR spectroscopy. The $^1H-NMR$ lineshape coupled to $^{14}N$ nucleus were analyzed to obtain the reorientational correlation times ${\tau}_c$ of NEAA. The data indicate that the coupling of solute and solvent decreases as the chain length of n-alcohols increases. But in the n-alcohols the reorientational motion depends almost linearly on η/T of solvents over our temperature range. The results are discussed in the context of the subslip phenomenon.

핵자기공명분광법으로 일련의 n-알코올 용액에서 N-에틸아세트미드(NEAA) NH-기의 $^1H-NMR$ 스펙트럼을 310~350k 온도 영역에서 찍어내었다. $^{14}N$-핵에 짝짓기를 한 $^1H$-스펙트럼의 선모양을 분석하여 NEAA의 재배향 상관관계시간 ${\tau}_c$를 얻었다. 용질과 용매의 상호작용은 용매의 사슬 길이가 증가하면서 감소하는 것을 실험 데이타는 보여주고 있다. 그러나 알코올 용매에서 재배향 운동은 실험한 온도영역에서 용매의 η/T에 거의 선형적으로 비례하였다. 그 결과를 subslip 현상으로 고찰하였다.

Keywords

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