Y. Koyama, T. Shimanouchi
Aug 1, 1968
Citations
1
Influential Citations
48
Citations
Journal
Biopolymers
Abstract
Infrared spectra in the region 4000–60 cm−1 have been measured for acetylglycine N‐methylamide and its deuterium homologs, CD3CONHCH2CONHCH3, CH3‐CONHCD2CONHCH3, CH2CONHCH2CONHCD3, and CH3CONDCH2CONDCH3. Normal frequencies have also been calculated for these molecules with various conformations. The spectra show that this compound has two crystalline modifications, form A and form B. The frequencies and their isotope shifts show that the molecular conformation (Ψ, ϕ) of form B is near (0, 120) and that of form A near (180, 120). The short‐range factors determining the conformation of peptide backbone having glycine residues are discussed.