title: Synthesis, characterization, optical properties and theoretical calculations of 6-fluoro coumarin.
abstract: 6-Fluoro coumarin is synthesized and characterized by (1)H NMR and (13)C NMR. The optical properties of the title compound are investigated by UV-vis absorption and fluorescence emission spectra, the results show the title compound can absorb UV-vis light at 319, 269 and 215nm, moreover it exhibits blue-purple fluorescence emission at 416nm. Theoretical studies on molecular structure, infrared spectra (IR), nuclear magnetic resonance ((1)H NMR, (13)C NMR) chemical shifts, UV-vis absorption and fluorescence emission of the synthesized compound have been worked out. Most chemical calculations were performed by density functional theory (DFT) method at the B3LYP/6-311G(d,p) level (NMR at B3LYP/Aug-CC-Pvdz level) using Gaussian 09 program. The compared results reveal that the scaled theoretical vibrational frequencies are in good accordance with the observed spectra; computational chemical shifts are consistent with the experimental values in most parts, except for some minor deviations; the UV-vis absorption calculated matches the experimental one very well, and the fluorescence emission spectrum is in good agreement with the experimental one when the solute-solvent hydrogen-bonding interaction is considered. These good coincidences prove that the computational methods selected can be used to predict these properties of other similar materials where it is difficult to arrive at experimental results.
authors.affiliation: College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China. Electronic address: baiyihui@zjnu.cn.
authors.forename: Yihui
authors.initials: Y
authors.lastname: Bai
authors.affiliation: College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China.
authors.forename: Jinyan
authors.initials: J
authors.lastname: Du
authors.affiliation: College of Chemistry and Life Sciences, Zhejiang Normal University, Jinhua, Zhejiang 321004, PR China. Electronic address: xuexian@zjnu.cn.
authors.forename: Xuexiang
authors.initials: X
authors.lastname: Weng
mesh_terms: D003374:Coumarins / Q000138:chemical synthesis / Q000737:chemistry*; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D005461:Fluorine / Q000737:chemistry*; D054879:Halogenation; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D011789:Quantum Theory; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D003374:Coumarins; D005456:Fluorescent Dyes; D005461:Fluorine
keywords: 6-Fluoro coumarin; Absorption; DFT calculation; Fluorescence; IR; NMR