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FTIR, FT-Raman spectra and quantum chemical studies of nebivolol

Fourier transform infrared and Raman spectra of nebivolol have been recorded. The structure, conformational stability, geometry optimisation, and vibrational wave numbers have been investigated. Satisfactory vibrational assignments were made for the stable conformer of the molecule using Restricted Hartree–Fock (RHF) and density functional theory (DFT) calculation (B3LYP) with the 6-31G(d,p) basis set. Comparison of the observed fundamental vibrational wave numbers of the molecule and calculated results by RHF and DFT methods indicates that B3LYP is superior for molecular vibrational problems. Comparison of the simulated spectra with the experimental spectra provides important information about the ability of the computational method to describe the vibrational modes. The RHF and DFT-based NMR calculation procedure was also done. It was used to assign the 13C NMR chemical shift of nebivolol.