13C nuclear magnetic resonance studies of the binding of alkali and alkaline earth metal salts to amides

Authors:
  • CRCh. Pulla Rao
    Ch. Pulla Rao
  • PBPadmanabhan Balaram
    Padmanabhan Balaram
  • CRC. N. Ramachandra Rao
    C. N. Ramachandra Rao
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Abstract
13 C resonances of carbonyl and methyl groups in amides are shifted down-field on interaction with alkali and alkaline earth metal salts. The magnitude of the shift depends on the ionic potential of the cation. Ions like Li+ bind to the amide carbonyl group both in neat amide solutions as well as in concentrated salt solutions in water.