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Title: Absorption and fluorescence spectra of disperse red 19-An azo dye
Authors: Jaggi, Neena
Giri, Manoj
Yadav, Kanta
Keywords: Azo dyes;Absorption;Fluorescence;Oscillator strength;(*←n) transition, Stokes shift
Issue Date: Dec-2013
Publisher: NISCAIR-CSIR, India
Abstract: The absorption and fluorescence spectra of disperse red 19 (C16H18N4O4), a fluorescent azo dye have been recorded in ethanol at concentrations between 10-3 M and 10-6 M. This dye finds use in many scientific and industrial applications. This has led to the determination of optimum concentrations to record the absorption and fluorescence spectra of the molecule. The absorption spectrum shows two absorption peaks at 285 and 495 nm, recorded in the spectral region 200-700 nm, which have been assigned to (*← )1G, 1B←1A and (*←n)1W←1A transitions, respectively. Fluorescence spectra of the compound have shown two fluorescence peaks at 324 and 640 nm at different concentrations giving Stokes shift of the order of 39 and 145 nm, respectively.
Page(s): 833-836
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.51(12) [December 2013]

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