Bulletin of the Korean Chemical Society

  • 제7권1호
  • /
  • Pages.1-5
  • /
  • 1986
  • /
  • 0253-2964(pISSN)
  • /
  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Effects of Li$^+$ and Ag$^+$ Ions on the Rotational Barrier in Acetamide and propionamide System

  • Kwon, Dae-Keun (Department of Chemistry, Korea University) ;
  • Choi, Young-Sang (Department of Chemistry, Korea University) ;
  • Yoon, Chang-Ju (Department of Chemistry, Song Sim College for Women)
  • 발행 : 1986.02.20
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초록

The influences of $LiNO_3\;and\;AgNO_3$ on the N-C(O) rotational barrier of N,N-dimethylacetamide and N,N-dimethylpropionamide have been investigated. The rotational activation free energy $({\Delta}G^{\neq})\;for\;Li^{+}$-amide complexes is found to increase with increasing salt concentration. On the other hand, that for $Ag^+$-amide complexes increases in the presence of $Ag^+$ ion up to 0.25 M ion concentration and then decreases as the concentration of $Ag^+$ ion is further increased. Such an unusual behavior of $Ag^+$-amide complexes has been interpreted in terms of ion-pairing and diluent effect on the amides. However, $^{13}C$ nmr chemical shift data for the amides have shown that both of these ions interact primarily with the carbonyl group in amides.

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