Normal modes of poly(l-valine) in relation to spectra of oligovalines

Abstract

Poly(L-valine) (PLV) belongs to the class of polyamino acids having a bulky side chain. It preferably adopts β-sheet conformation, although high molecular weight PLV may form an α helix as well. In the present communication we report a detailed study of the phonons and their dispersion for β-PLV and the spectra of oligovalines in relation to its polymeric form. The N-deuterated analog of β-PLV has also been studied to confirm the correctness of assignments and force-field. Density-of-states and heat capacity have been obtained. The heat capacity is in very good agreement with the experimental measurements of Roles et al. © 1995, The Society of Polymer Science, Japan. All rights reserved.