NON-PLANAR DISTORTIONS IN A PEPTIDE UNIT AS STUDIED BY NMR IN LIQUID CRYSTAL SOLVENTS

C L KHETRAPAL, S RAMAPRASAD

Abstract


A brief account of the results on non-planar distortions around the nitrogen atom in a peptide unit as studied by NMR in liquid crystal solvents is given. The studies are confined to simple model compounds namely, formamide, N-methyl formamide and its and '5N isotopically enriched analogues and N-methyl acetamide. Under the assumption of reasonable geometry and the neglect of the influences of molecular vibrations, it is observed that the non-planar distortions around the nitrogen atom are nearly 10" ± 50.

Keywords


Peptide unit; chemical shift; indirect spin-spin coupling constants; direct dipolar couplings; order parameter; nematic phase; lyotropic phase.

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