title: Natural bond orbital analysis, electronic structure and vibrational spectral analysis of N-(4-hydroxyl phenyl) acetamide: a density functional theory.
abstract: The Fourier transform infrared (FT-IR) and FT-Raman spectra of N-(4-hydroxy phenyl) acetamide (N4HPA) of painkiller agent were recorded in the region 4000-450 cm(-1) and 4000-50 cm(-1) respectively. Density functional theory (DFT) has been used to calculate the optimized geometrical parameter, atomic charges, and vibrational wavenumbers and intensity of the vibrational bands. The computed vibrational wave numbers were compared with the FT-IR and FT-Raman experimental data. The computational calculations at DFT/B3LYP level with 6-31G(d,p), 6-31++G(d,p), 6-311G(d,p) and 6-311++G(d,p) basis sets. The complete vibrational assignments were performed on the basis of the potential energy distribution (PED) of the vibrational modes calculated using Vibrational energy distribution analysis (VEDA 4) program. The oscillator's strength calculated by TD-DFT and N4HPA is approach complement with the experimental findings. The NMR chemical shifts 13C and 1H were recorded and calculated using the gauge independent atomic orbital (GIAO) method. The molecular electrostatic potential (MESP) and electron density surfaces of the molecule were constructed. The Natural charges and intermolecular contacts have been interpreted using Natural Bond orbital (NBO) analysis the HOMO-LUMO energy gap has been calculated. The thermodynamic properties like entropy, heat capacity and zero vibrational energy have been calculated.
authors.affiliation: Department of Physics, Karpagam University, Eachanari, Coimbatore 641021, TN, India.
authors.forename: P
authors.initials: P
authors.lastname: Govindasamy
authors.affiliation: Research and Development St. Peter's Institute of Higher Education and Research, St. Peter's University, Avadi, Chennai 600054, TN, India. Electronic address: deanresearchspu@gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Gunasekaran
authors.affiliation: PG and Research Department of Physics, Pachaiyappa's College, Chennai 600030, TN, India.
authors.forename: G R
authors.initials: GR
authors.lastname: Ramkumaar
mesh_terms: D000081:Acetamides / Q000737:chemistry*; D000700:Analgesics / Q000737:chemistry*; D002244:Carbon / Q000737:chemistry; D002626:Chemistry, Pharmaceutical; D005583:Fourier Analysis; D006859:Hydrogen / Q000737:chemistry; D008968:Molecular Conformation; D010636:Phenols / Q000737:chemistry*; D011208:Powders; D012984:Software; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D055672:Static Electricity; D013816:Thermodynamics; D014466:Ultraviolet Rays; D014732:Vibration
chemical_list: D000081:Acetamides; D000700:Analgesics; D010636:Phenols; D011208:Powders; C074036:4-(hydroxyphenyl)acetamide; D002244:Carbon; D006859:Hydrogen
keywords: DFT; FT-IR; FT-Raman; HOMO–LUMO; N4HPA