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- W2017135060 abstract "Least-squares adjustment of the force constants of N -methylacetamide belonging to the A ′ symmetry block was carried out starting from the force constant values obtained by an ab initio SCF MO calculation with the 4–31G basis set. Fourteen diagonal force constants were adjusted by the use of 122 vibrational frequencies of 9 isotope derivatives in the liquid state observed in the region 2000-100 cm −1 . Here, all the off-diagonal elements were fixed at the initial values calculated with the 4–31G basis set. The greatest difference between the observed and calculated frequencies was 30 cm −1 , and the differences for 94 modes were less than 10 cm −1 . Most of the force constatns of bond stretching modes were reduced by 5–10%, and those of angle deformation modes by 20–30% in the course of the least-squares adjustment. The CO stretching force constant was lowered by 30% in the adjustment, and this is understandable because the adjustment involves the effect of bringing the peptide group from a free to a hydrogen-bonded state." @default.
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- W2017135060 date "1984-12-01" @default.
- W2017135060 modified "2023-09-30" @default.
- W2017135060 title "In-plane force constants of the peptide group: Least-squares adjustment starting from ab initio values of N-methylacetamide" @default.
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- W2017135060 doi "https://doi.org/10.1016/0022-2852(84)90179-6" @default.
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