title: Analysis of vibrational spectra of 4-amino-2,6-dichloropyridine and 2-chloro-3,5-dinitropyridine based on density functional theory calculations.
abstract: This work deals with the vibrational spectroscopy of 4-amino-2,6-dichloropyridine (ADCP) and 2-chloro-3,5-dinitropyridine (CDNP) by means of quantum chemical calculations. The mid and far FTIR and FT-Raman spectra were measured in the condensed state. The fundamental vibrational frequencies and intensity of vibrational bands were evaluated using density functional theory (DFT) with the standard B3LYP/6-31G(*) and B3LYP/6-311+G(**) methods and basis set combinations, and was scaled using various scale factors which yields a good agreement between observed and calculated frequencies. The vibrational spectra were interpreted with the aid of normal coordinate analysis based on scaled density functional force field. The results of the calculations were applied to simulated infrared and Raman spectra of the title compounds, which showed excellent agreement with the observed spectra.
authors.affiliation: Department of Physics, Periyar University, Salem 636001, India. vkrishna_kumar@yahoo.com
authors.forename: V
authors.initials: V
authors.lastname: Krishnakumar
authors.forename: S
authors.initials: S
authors.lastname: Dheivamalar
authors.forename: R John
authors.initials: RJ
authors.lastname: Xavier
authors.forename: V
authors.initials: V
authors.lastname: Balachandran
mesh_terms: D002244:Carbon / Q000737:chemistry; D008956:Models, Chemical; D015394:Molecular Structure; D009584:Nitrogen / Q000737:chemistry; D011725:Pyridines / Q000737:chemistry*; D012984:Software; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013059:Spectrum Analysis, Raman; D014732:Vibration
chemical_list: D011725:Pyridines; D002244:Carbon; D009584:Nitrogen