title: Effect of solvents on the photophysical properties of substituted imidazonaphthyridine derivatives.
abstract: The absorption and fluorescence characteristics of three substituted imidazonaphthyridine derivatives are studied in a series of organic solvents. The variation of Stokes shift with the polarity parameter of the solvent is studied and the excited state dipole moment of these derivatives is higher than the ground state dipole moment. The fluorescence lifetime profile shows single exponential decay in all the solvents. The fluorescence quantum yield, radiative and non-radiative rate constants are also calculated and these parameters show much variation in the change in substitution of these derivatives.
authors.affiliation: Department of Physics, Anna University, Chennai, India.
authors.forename: C
authors.initials: C
authors.lastname: Vijila
authors.forename: A
authors.initials: A
authors.lastname: Ramalingam
authors.forename: V S
authors.initials: VS
authors.lastname: Gowri
authors.forename: S O
authors.initials: SO
authors.lastname: Chua
authors.forename: K
authors.initials: K
authors.lastname: Sivakumar
mesh_terms: D005453:Fluorescence; D007093:Imidazoles / Q000737:chemistry*; D015394:Molecular Structure; D009287:Naphthyridines / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence / Q000379:methods
chemical_list: C412334:2-(3,4-difluorophenyl)-6-methyl-8-trifluoromethylimidazo(1,2-a)(1,8)naphthyridine; C412335:2-(4-chlorophenyl)-6-methyl-8-trifluoromethylimidazo(1,2-a)(1,8)naphthyridine; C412336:6-methyl-2,8-diphenylimidazo(1,2-a)(1,8)naphthyridine; D007093:Imidazoles; D009287:Naphthyridines; D012997:Solvents