title: Fluorescence emission of disperse Red 1 in solution at room temperature.
abstract: In this article, we report the fluorescence emission of Disperse Red 1 in solution at room temperature and pumping at 532 nm with a 25 mW diode laser. We have measured its fluorescence quantum yield in methanol, ethylene glycol, glycerol, and phenol obtaining values as high as 10(-3) in the aliphatic alcohols. The excitation spectra of Disperse Red 1 in all four solvents as well as its excitation anisotropy in glycerol are presented. Applying a Gaussian decomposition method to the absorption spectra along with the support from the excitation spectra, the positions of the different transitions in this pseudo-stilbene azobenzene dye were determined. Solvatochromic and isomerization constraint effects are discussed. Calculations using density functional theory at TD-B3LYP/6-31G*//HF/6-31G* level were performed to interpret the experimental observations.
authors.affiliation: Department of Chemistry, University of Central Florida, P.O. Box 162366, Orlando, Florida 382616-2366, USA.
authors.forename: Carlos
authors.initials: C
authors.lastname: Toro
authors.forename: Arthur
authors.initials: A
authors.lastname: Thibert
authors.forename: Leonardo
authors.initials: L
authors.lastname: De Boni
authors.forename: Artëm E
authors.initials: AE
authors.lastname: Masunov
authors.forename: Florencio E
authors.initials: FE
authors.lastname: Hernández