Vibrational spectral investigations and density functional theory study of 4-Formylbenzoic acid
T S Xavier1, I Hubert Joe, M A Palafox
1St. Xaviers HSS Peyad, Trivandrum 695 573, Kerala, India.
Abstract:
An accurate assignment of the vibrational spectra of 4-Formylbenzoic acid in solid state was carried out. For this purpose density functional calculations (DFT) were performed to clarify wavenumber assignments of the experimentally observed bands for the first time. A scaling of the wavenumbers was carried out to improve the calculated values. Good reproduction of the experimental wavenumbers is obtained and the % error is very small in the majority of cases. The NBO analysis was carried out, and it reveals hyper conjugative interaction, ICT and stabilization of molecules.
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