title: Molecular structure, vibrational, electronic and thermal properties of 4-vinylcyclohexene by quantum chemical calculations.
abstract: The solid phase FT-IR and FT-Raman spectra of 4-vinylcyclohexene (abbreviated as 4-VCH) have been recorded in the region 4000-100cm(-1). The optimized molecular geometry and vibrational frequencies of the fundamental modes of 4-VCH have been precisely assigned and analyzed with the aid of structure optimizations and normal coordinate force field calculations based on density functional theory (DFT) method at 6-311++G(d,p) level basis set. The theoretical frequencies were properly scaled and compared with experimentally obtained FT-IR and FT-Raman spectra. Also, the effect due the substitution of vinyl group on the ring vibrational frequencies was analyzed and a detailed interpretation of the vibrational spectra of this compound has been made on the basis of the calculated total energy distribution (TED). The time dependent DFT (TD-DFT) method was employed to predict its electronic properties, such as electronic transitions by UV-Visible analysis, HOMO and LUMO energies, molecular electrostatic potential (MEP) and various global reactivity and selectivity descriptors (chemical hardness, chemical potential, softness, electrophilicity index). Stability of the molecule arising from hyper conjugative interaction, charge delocalization has been analyzed using natural bond orbital (NBO) analysis. Atomic charges obtained by Mulliken population analysis and NBO analysis are compared. Thermodynamic properties (heat capacity, entropy and enthalpy) of the title compound at different temperatures are also calculated.
authors: Department of Physics, Arignar Anna Govt. Arts & Science College, Karaikal, Puducherry, India. Electronic address: ekrubha@yahoo.com.
authors: P B
authors: PB
authors: Nagabalasubramanian
authors: Department of Physics, Tagore Arts College, Puducherry, India.
authors: S
authors: S
authors: Periandy
authors: Department of Mechatronics Engineering, H.F.T. Technology Faculty, Celal Bayar University, Turgutlu, Manisa, Turkey.
authors: Mehmet
authors: M
authors: Karabacak
authors: Department of Physics, Avvaiyar Govt. College for Women, Karaikal, Puducherry, India.
authors: M
authors: M
authors: Govindarajan
mesh_terms: D053138:Cyclohexenes / Q000737:chemistry*; D004121:Dimethyl Sulfoxide / Q000737:chemistry; D004583:Electrons; D000431:Ethanol / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D017711:Nonlinear Dynamics; D011789:Quantum Theory; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D055672:Static Electricity; D013696:Temperature; D014732:Vibration; D014867:Water / Q000737:chemistry
chemical_list: D053138:Cyclohexenes; D014867:Water; C013733:4-vinylcyclohexene; D000431:Ethanol; D004121:Dimethyl Sulfoxide
keywords: 4-Vinylcyclohexene; DFT; HOMO–LUMO; NLO and NBO; Vibrational analysis