On the conformations of poly-N-methyl-L-alanine (PNMA) in solution

High-resolution nuclear magnetic resonance spectra at 100 MHz have been obtained on poly-N-methyl-L -alanine in the chloroform–trifluoroacetic acid system under various conditions of solvent composition. Different spectra are observed for the CH₃–C_α, C_α–H, and N–CH₃ protons. On the basis of conformational analysis an interpretation of the NMR results was attempted.