Vibrational spectra and normal vibrations of N-methyl acetamide
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The variation in the vibrational frequencies of N-methyl acetamide in solutions compared to the frequencies of the pure amide, obtained from infra-red and Raman spectra are discussed. By splitting the molecule into two groups so that C-N is a common bond for both the groups, the normal co-ordinate treatment of N-methyl acetamide is carried out and the fundamental frequencies are calculated. On the basis of these calculations, the band at 990 cm.−1 is assigned to N-CH3 stretch. Using Gordy’s equation and the force constant for the C=O stretch, the bond order of C=O bond is calculated.
KeywordsForce Constant Rabies Vibrational Spectrum Bond Order Normal Vibration
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