SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY, cilt.104, ss.222-234, 2013 (SCI-Expanded)
Mirtazapine (+/-)-1,2,3,4,10,14b-hexahydro-2-methylpyrazino(2,1-a)pyrido(2,3-c)(2)benzazepine is a compound with antidepressant therapeutic effects. It is the 6-aza derivative of the tetracyclic antidepressant mianserin (+/-)-2-methyl-1,2,3,4,10,14b-hexahydrodibenzo[c,f]pyrazino[1,2-alpha]azepine. The FT-IR and FT-Raman spectra of mirtazapine have been recorded in 4000-400 cm(-1) and 3500-10 cm(-1), respectively. The optimized geometry, energies, nonlinear optical properties, vibrational frequencies, C-13, H-1 and N-15 NMR chemical shift values of mirtazapine have been determined using the density functional theory (DFT/B3LYP) method. A comparison of the experimental and theoretical results of mirtazapine indicates that the density-functional B3LYP method is able to provide satisfactory results for predicting vibrational and NMR properties. The experimental and calculated results for mirtazapine have also been compared with mianserin. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.