title: Experimental (FTIR and FT-Raman) and ab initio and DFT study of vibrational frequencies of 5-amino-2-nitrobenzoic acid.
abstract: The FTIR and FT-Raman spectra of 5-amino-2-nitrobenzoic acid (ANB) have been recorded in the region 400-4000 cm(-1). The observed frequencies were assigned to different modes of vibrations on the basis of fundamental, combination and overtones. The geometry has been optimized with complete relaxation on the potential energy surface at HF, MP2 and B3LYP level of theories using 6-311++G(d,p) basis set and compared with the crystal data. The possible hydrogen bond interaction has been estimated taking a model compound. Further harmonic vibrational frequency calculations have been carried out at HF and B3LYP levels and the scaled values were in good agreement with majority of the experimental observations. The theoretically constructed spectra coincide satisfactorily with those of experimental spectra.
authors.affiliation: Department of Chemistry, Rajah Serfoji Government College, Thanjavur 613005, India. km_ramalingam@yahoo.co.in
authors.forename: M
authors.initials: M
authors.lastname: Ramalingam
authors.forename: N
authors.initials: N
authors.lastname: Sundaraganesan
authors.forename: H
authors.initials: H
authors.lastname: Saleem
authors.forename: J
authors.initials: J
authors.lastname: Swaminathan
mesh_terms: D002244:Carbon / Q000737:chemistry; D002621:Chemistry / Q000379:methods; D006859:Hydrogen / Q000737:chemistry; D006860:Hydrogen Bonding; D008956:Models, Chemical; D008962:Models, Theoretical; D008968:Molecular Conformation; D015394:Molecular Structure; D009579:Nitrobenzoates / Q000032:analysis* / Q000737:chemistry; D009585:Nitrogen Dioxide / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000379:methods*; D014732:Vibration
chemical_list: D009579:Nitrobenzoates; C019251:5-amino-2-nitrobenzoic acid; D002244:Carbon; D006859:Hydrogen; D009585:Nitrogen Dioxide