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Phonons and their dispersion in poly(S-benzyl-L-cysteine)

✍ Scribed by Deepti Kapoor; Navnit K. Misra; Poonam Tandon; V. D. Gupta

Publisher: John Wiley and Sons
Year: 1999
Tongue: English
Weight: 329 KB
Volume: 37
Category: Article
ISSN: 0887-6266
DOI: 10.1002/(sici)1099-0488(19991201)37:23<3269::aid-polb2>3.0.co;2-t

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✦ Synopsis

Poly(S-benzyl-L-cysteine) (PBLC) is a S-benzyl derivative of the natural amino acid poly(L-cysteine). Its normal modes and their dispersion in antiparallel ␤-sheet conformation have been obtained within the first Brillouin zone using Wilson's G.F. matrix method, as modified by Higgs for an infinite polymeric chain. The zone center frequencies and the Urey Bradley force field have been obtained by "best fitting" the observed Fourier transform IR (FTIR) absorption bands. The characteristic features of dispersion curves such as crossing, repulsion, and exchange of character are discussed. Predictive values of heat capacity in the temperature range of 50 -500 K are reported.

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