Vibrational spectra and normal coordinate analysis on structure of nitrazepam

162-168A normal coordinate analysis on nitrazepam has been carried out with a set of symmetry co-ordinates following Wilson's F-G matrix method. The potential constants evaluated for the molecule are found to be in good agreement with literature values thereby conforming the vibrational assignments. To check whether the chosen set of vibrational frequencies contributes maximum to the potential energy associated with the normal co-ordinates of the molecule, the potential energy distribution has been evaluated