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A normal mode calculation has been done for Pro‐Leu‐Gly‐NH 2 in its crystalline type II β‐turn structure, and assignments have been made to infrared and Raman bands of this molecule and its N ‐deuterated derivative. Observed and calculated frequencies below 1700 cm ‐1 agree to within about 6 cm ‐1 . This analysis provides a sound basis for studying the conformation dependence of the vibrational spectrum.
Naik et al. (Sun,) studied this question.