title: Specific interactions of alcohols and non-alcohols with a biologically active boronic acid derivative: a spectroscopic study.
abstract: The photophysical properties of 4-fluoro-2-methoxyphenyl boronic acid (4FMPBA) are characterized using absorption and fluorescence techniques in series of non-alcohols and alcohols. The results are analyzed using different solvent polarity functions and Kamlet and Catalan's multiple regression approaches. The excited state dipole moment and change in dipole moment are calculated using both the solvatochromic shift method and Reichardt's microscopic solvent polarity parameter ETN. The ground state dipole moment is evaluated using quantum chemical calculations. It is found that general solute-solvent and hydrogen bond interactions are operative in this system. A red shift of ~ 9 nm in the emission spectra is observed with an increase in the solvent polarity, which depicts π→π(*) transitions, as well as the possibility of an intramolecular charge transfer (ICT) character in the emitting singlet state of 4FMPBA. The relative quantum yield, radiative and non-radiative decay constants are calculated in alkanes and alcohols using the single point method. It is found that the quantum yield of the molecule varies from 16.81% to 50.79% with the change in solvent polarity, indicating the dependence of fluorescence on the solvent environment. Copyright © 2015 John Wiley & Sons, Ltd.
authors.affiliation: Department of Physics, Bangalore Institute of Technology, Bangalore, 560004, Karnataka, India.
authors.forename: H S
authors.initials: HS
authors.lastname: Geethanjali
authors.affiliation: Department of Physics, M S Ramaiah Institute of Technology, Bangalore, 560054, Karnataka, India.
authors.forename: R M
authors.initials: RM
authors.lastname: Melavanki
authors.affiliation: Department of Physics, Bangalore Institute of Technology, Bangalore, 560004, Karnataka, India.
authors.forename: D
authors.initials: D
authors.lastname: Nagaraja
authors.affiliation: Department of Physics, BVB College of Engineering and Technology, Hubli, 580031, Karnataka, India.
authors.forename: N R
authors.initials: NR
authors.lastname: Patil
authors.affiliation: Department of Physics, B.N.M. Institute of Technology, Bangalore, 560070, Karnataka, India.
authors.forename: J
authors.initials: J
authors.lastname: Thipperudrappa
authors.affiliation: Department of Chemistry, R V College of Engineering, Bangalore, 560059, Karnataka, India.
authors.forename: R A
authors.initials: RA
authors.lastname: Kusanur
mesh_terms: D000438:Alcohols / Q000737:chemistry*; D001897:Boronic Acids / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D000438:Alcohols; D001897:Boronic Acids
keywords: boronic acid derivative; dipole moment; relative quantum yield; solvatochromic shift method