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Density functional theory, restricted Hartree-Fock simulations and FTIR, FT-Raman and UV-Vis spectroscopic studies on lamotrigine.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2013-06-19)
T Ramya, S Gunasekaran, G R Ramkumaar
ABSTRACT

The Fourier Transform Infrared (FTIR) and FT Raman spectra of lamotrigine have been recorded in the region 4000-450 cm(-1) and 4000-50 cm(-1), respectively. The title compound is used as Antiepileptic drug. The optimized geometry, frequency, and intensities of the vibrational bands of the lamotrigine were obtained by Density Functional Theory (DFT) using B3LYP/631G** basis set and ab initio method at the restricted Hartree Fock/6-31** level. The harmonic vibrational frequencies, Natural population analysis, HOMO-LUMO energy gap, infra red intensities and Raman scattering activities, force constant were calculated by DFT and RHF methods. The quality of lamotrigine under different storage containers were analyzed using UV-Vis spectral technique.

MATERIALS
Product Number
Brand
Product Description

Sigma-Aldrich
Lamotrigine, ≥98%, powder
Lamotrigine for system suitability, European Pharmacopoeia (EP) Reference Standard
Lamotrigine for peak identification, European Pharmacopoeia (EP) Reference Standard
Lamotrigine, European Pharmacopoeia (EP) Reference Standard
Supelco
Lamotrigine solution, 1.0 mg/mL in methanol, ampule of 1 mL, certified reference material, Cerilliant®