title: Study of conformational stability, structural, electronic and charge transfer properties of cladrin using vibrational spectroscopy and DFT calculations.
abstract: In the present work, a detailed conformational study of cladrin (3-(3,4-dimethoxy phenyl)-7-hydroxychromen-4-one) has been done by using spectroscopic techniques (FT-IR/FT-Raman/UV-Vis/NMR) and quantum chemical calculations. The optimized geometry, wavenumber and intensity of the vibrational bands of the cladrin in ground state were calculated by density functional theory (DFT) employing 6-311++G(d,p) basis sets. The study has been focused on the two most stable conformers that are selected after the full geometry optimization of the molecule. A detailed assignment of the FT-IR and FT-Raman spectra has been done for both the conformers along with potential energy distribution for each vibrational mode. The observed and scaled wavenumber of most of the bands has been found to be in good agreement. The UV-Vis spectrum has been recorded and compared with calculated spectrum. In addition, 1H and 13C nuclear magnetic resonance spectra have been also recorded and compared with the calculated data that shows the inter or intramolecular hydrogen bonding. The electronic properties such as HOMO-LUMO energies were calculated by using time-dependent density functional theory. Molecular electrostatic potential has been plotted to elucidate the reactive part of the molecule. Natural bond orbital analysis was performed to investigate the molecular stability. Non linear optical property of the molecule have been studied by calculating the electric dipole moment (μ) and the first hyperpolarizability (β) that results in the nonlinearity of the molecule.
authors.affiliation: Department of Physics, University of Lucknow, Lucknow 226 007, India.
authors.forename: Swapnil
authors.initials: S
authors.lastname: Singh
authors.affiliation: Department of Physics, University of Lucknow, Lucknow 226 007, India.
authors.forename: Harshita
authors.initials: H
authors.lastname: Singh
authors.affiliation: Department of Physics, University of Lucknow, Lucknow 226 007, India.
authors.forename: Anubha
authors.initials: A
authors.lastname: Srivastava
authors.affiliation: Department of Physics, University of Lucknow, Lucknow 226 007, India. Electronic address: poonam_tandon@yahoo.co.uk.
authors.forename: Poonam
authors.initials: P
authors.lastname: Tandon
authors.affiliation: Department of Physics, University of Lucknow, Lucknow 226 007, India.
authors.forename: Kirti
authors.initials: K
authors.lastname: Sinha
authors.affiliation: Department of Physics, University of Lucknow, Lucknow 226 007, India.
authors.forename: Purnima
authors.initials: P
authors.lastname: Bharti
authors.affiliation: Medicinal and Process Chemistry Division, Central Drug Research Institute, Sector 10, Jankipuram Extension, Lucknow 226 031, Uttar Pradesh, India.
authors.forename: Sudhir
authors.initials: S
authors.lastname: Kumar
authors.affiliation: Medicinal and Process Chemistry Division, Central Drug Research Institute, Sector 10, Jankipuram Extension, Lucknow 226 031, Uttar Pradesh, India.
authors.forename: Padam
authors.initials: P
authors.lastname: Kumar
authors.affiliation: Medicinal and Process Chemistry Division, Central Drug Research Institute, Sector 10, Jankipuram Extension, Lucknow 226 031, Uttar Pradesh, India.
authors.forename: Rakesh
authors.initials: R
authors.lastname: Maurya
mesh_terms: D016880:Anisotropy; D004583:Electrons; D007529:Isoflavones / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D000432:Methanol / Q000737:chemistry; D008958:Models, Molecular; D008968:Molecular Conformation; D017711:Nonlinear Dynamics; D055620:Optical Phenomena; D011789:Quantum Theory; D012997:Solvents; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013059:Spectrum Analysis, Raman; D055672:Static Electricity; D013816:Thermodynamics; D014732:Vibration
chemical_list: D007529:Isoflavones; D012997:Solvents; C558945:cladrin; D000432:Methanol
keywords: FT-IR; FT-Raman; NMR; UV–Vis spectroscopy