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Preresonance Raman studies of poly( L ‐lysine), poly( L ‐glutamic acid), and deuterated N ‐methylacetamides
Author(s) -
Sugawara Yoko,
Harada Issei,
Matsuura Hiroatsu,
Shimanouchi Takehiko
Publication year - 1978
Publication title -
biopolymers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.556
H-Index - 125
eISSN - 1097-0282
pISSN - 0006-3525
DOI - 10.1002/bip.1978.360170603
Subject(s) - raman spectroscopy , chemistry , amide , deuterium , molecule , polymer , excited state , lysine , polyamide , crystallography , stereochemistry , analytical chemistry (journal) , polymer chemistry , amino acid , organic chemistry , optics , biochemistry , physics , quantum mechanics , nuclear physics
The Raman spectra of poly( L ‐lysine) with various structures, ionized poly( L ‐glutamic acid), and deuterated N ‐methylacetamides have been observed using visible and the 257.3‐nm laser lines as the light source. Most of the Raman bands with significantly enhanced intensities in the uv‐excited spectra of the polymers have been assigned to the vibrations associated with the CO and C–N stretching modes, the amide I, II, III, I′, II′, and III′, with reference to the results obtained for simple amide molecules including the deuterated N ‐methylacetamides. Several amide frequencies have been newly identified and the structures of the polymers have been discussed through the comparison of the Raman and ir amide frequencies.