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Spectrochim Acta A Mol Biomol Spectrosc. 2012 Feb;86:242-51. doi: 10.1016/j.saa.2011.10.031. Epub 2011 Oct 20.

FT-IR, FT-Raman, ab initio and DFT studies, HOMO-LUMO and NBO analysis of 3-amino-5-mercapto-1,2,4-triazole.

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  • 1PG and Research Department of Physics, Periyar EVR College (Autonomous), Tiruchirappalli 620 023, India. rj xavier@yahoo.com

Abstract

The molecular vibrations of 3-amino-5-mercapto-1,2,4-triazole (AMT) have been investigated in polycrystalline sample, at room temperature, by Fourier transform infrared (FT-IR) and FT-Raman spectroscopies. A detailed vibrational spectral analysis has been carried out and assignments of the fundamental modes have been proposed on the basis of peak positions and relative frequencies, atomic charges, HOMO-LUMO energies and several thermodynamic properties in the ground state were calculated using ab initio Hartree-Fock (HF) and Density Functional Theory, (B3LYP) with 6-311G(d,p) and 6-311++G(d,p) basis sets. With the aid of scaling procedures, observed wave numbers in FT-IR and FT-Raman spectra were analyzed and assigned to different normal modes of the molecule. Most of the modes have wave numbers in the expected range. The theoretical IR and Raman spectra have also been constructed. Natural Bond Orbital (NBO) study explains charge delocalization of the molecule.

Copyright © 2011 Elsevier B.V. All rights reserved.

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