Anharmonic vibrational studies of L-aspartic acid using HF and DFT calculations.

Mohammad Jane Alam, Shabbir Ahmad

Department of Physics, Aligarh Muslim University, Aligarh 202 002, India.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy 2012 Oct

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The experimental and theoretical studies on the structure, molecular properties and vibrational spectra of L-aspartic acid are presented. The molecular structure, harmonic and anharmonic vibrational frequencies, molecular properties, MEP mapping, NBO analysis and electronic spectra of L-aspartic acid have been reported. Computed geometrical parameters and anharmonic frequencies of fundamental, combination and overtone transitions were found in satisfactory agreement with the experimental data. The UV-Vis spectrum of present molecule has been recorded and the electronic properties such as HOMO and LUMO energies and few low lying excited states were carried out by using time dependent density functional theory (TD-DFT) approach. Natural Bond Orbital (NBO) analysis has been performed for analyzing charge delocalization throughout the molecule. Molecular electrostatic potential map has also been used for quantitative measure of the chemical activities of various sites of the molecule. Copyright © 2012 Elsevier B.V. All rights reserved.

Citation

Mohammad Jane Alam, Shabbir Ahmad. Anharmonic vibrational studies of L-aspartic acid using HF and DFT calculations. Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy. 2012 Oct;96:992-1004