title: Spectral properties of binaphthalene-coumarins interconnected through hydrazone linkage.
abstract: Photophysical properties of new coumarin-3-carbaldehyde (dihydrodinaphtho[2,1-c:1',2'-e]azepin-N-yl)imines bearing dimethylamino and methoxy groups at position 7 of coumarin were investigated. Dimethylamino derivative exhibits different solvent polarity dependence of fluorescent characteristics for nonpolar, medium polar and highly polar solvents. This effect can be rationalized by diverse charge distribution in the singlet excited state due to its different stabilization by solvation in the solvents of particular group. While 2-fold higher values of Stokes shift were observed for methoxy derivative, its quantum yield of fluorescence is much lower due to high nonradiative decay rate constant of the excited state.
authors.affiliation: Institute of Chemistry, Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, SK-84215 Bratislava, Slovak Republic.
authors.forename: Marek
authors.initials: M
authors.lastname: Cigáň
authors.forename: Juraj
authors.initials: J
authors.lastname: Filo
authors.forename: Henrieta
authors.initials: H
authors.lastname: Stankovičová
authors.forename: Anton
authors.initials: A
authors.lastname: Gáplovský
authors.forename: Martin
authors.initials: M
authors.lastname: Putala
mesh_terms: D003374:Coumarins / Q000737:chemistry*; D006835:Hydrazones / Q000737:chemistry*; D009281:Naphthalenes / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013050:Spectrometry, Fluorescence
chemical_list: D003374:Coumarins; D006835:Hydrazones; D009281:Naphthalenes; D012997:Solvents