Vibrational spectra of N-acetylglycine oligomers Part 2.—Raman scattering study of selectively C-deuteriated oligomers with polyglycine I- and II-type structures

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Hideki Etori, Keijiro Taga, Hirofumi Okabayashi and Kunihiro Ohshima


Abstract

Selectively C-deuteriated N-acetylglycine trimer and tetramer acid types have been synthesized, and their two crystalline modifications, solid-A and solid-B [which correspond in structure to polyglycine (PG) II and I, respectively] have been prepared. Raman scattering spectra have been measured for a series of these glycine oligomers, and the CH2- and CD2-characteristic modes have been investigated in detail. Assignment of the CH2-characteristic bands to each CH2 group in the oligomers has been carried out successfully. In particular, the results obtained from the CD2 stretch region show that N- and C-terminal glycine residues for the PGI- and PGII-type trimers and tetramers are all in very similar environments and that the glycine residues which are sandwiched between the two terminal residues are also in a similar environment for both the trimers and the tetramers.


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