Dispersion curves for the polyglycine I chain are calculated for both the in-plane and out-of-plane modes of vibration, and the force constants are fitted by comparison with observed infrared frequencies. Frequency distributions for polyglycine I and polyglycine II are calculated from inelastic neutron scattering. The intensity difference of the C–N torsional band between polyglycine I and polyglycine II suggests the presence of additional C–H···O-type hydrogen bonding between chains in the helical (II) form. An estimate of the sum of conformational and lattice energy difference in the two forms is made.
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Gupta et al. (1968) studied this question.
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