Vibrational spectra, NBO analysis, HOMO-LUMO and first hyperpolarizability of 2-{[(2-Methylprop-2-en-1-yl)oxy]methyl}-6-phenyl-2,3,4,5-tetrahydro-1,2,4- triazine-3,5-dione, a potential chemotherapeutic agent based on density functional theory calculations

Abstract

The experimental FT-IR and FT-Raman spectra of 2-{[(2-Methylprop-2-en-1-yl) oxy]methyl}-6-phenyl-2,3,4,5-tetrahydro-1,2,4-triazine-3,5-dione were recorded. The optimized geometric parameters, normal mode frequencies and corresponding vibrational assignments of the compound have been examined by means of density functional theory. Reliable vibrational assignments and molecular orbital have been investigated by the potential energy distribution and natural bonding orbital analyses, respectively. The calculated first hyperpolarizability of the title compound is 2.82 × 10-30 esu which is 21.69 times that of the standard NLO material urea. MEP was performed by the B3LYP level and the predicted infrared intensities and Raman activities have also been reported. Quantum chemical parameters were arrived from the frontier molecular orbital theory. The calculated geometrical parameters are in agreement with experimental results. From the MEP it is evident that the negative charge covers the CO groups and the positive region is over the rings and NH group. © 2014 Elsevier B.V. All rights reserved.