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Journal of Chemistry
Volume 2013, Article ID 712130, 16 pages
http://dx.doi.org/10.1155/2013/712130
Research Article

NLO and NBO Analysis of Sarcosine-Maleic Acid by Using HF and B3LYP Calculations

Sakarya Üniversitesi, Fen Edebiyat Fakültesi Fizik Bölümü, 54140 Adapazarı, Turkey

Received 26 June 2012; Accepted 25 July 2012

Academic Editor: Didier Siri

Copyright © 2013 N. Günay et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We report a theoretical study on molecular structure, vibrational spectra, nonlinear optical (NLO), and natural bond orbital (NBO) analysis of sarcosine-maleic acid (C7H11NO6) in the ground state calculated by using the Hartree-Fock (HF) and density functional method (DFT/B3LYP) with 6–31++G(d,p) basis set. We repeat NBO calculations with 6–31G(d,p) basis set so as to see the diffuse function impact on NBO analysis. Stability of the molecule arising from hyper conjugative interactions and charge delocalization has been analyzed using NBO analysis. NBO analysis shows that there is a O–HO and N–HO hydrogen bond in the title compound, which is consistent with the conclusion obtained by the analysis of molecular structure. The calculated HOMO and LUMO energies show that charge transfer occurs within the molecule. Also, these results are supported by the NLO parameters. Finally, the calculated results were applied to simulate infrared and Raman spectra of the title compound which showed good agreement with experimental ones.