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Spectral characteristics of 4-(p-N,N-dimethyl-aminophenylmethylene)-2-phenyl-5-oxazolone (DPO) in different media.

Spectral characteristics of 4-(p-N,N-dimethyl-aminophenylmethylene)-2-phenyl-5-oxazolone (DPO) in different media.

Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy (2012-05-18)

Abdullah M Asiri, Samy A El-Daly, Salman A Khan

ABSTRACT

The absorption and fluorescence characteristics of 4-(p-N,N-dimethyl-aminophenylmethylene)-2-phenyl-5-oxazolone (DPO) have been investigated in different solvents. DPO dye exhibits a large red shift in both absorption and emission spectra as solvent polarity increases, indicating a large change in the dipole moment of dye molecules upon excitation due to an intramolecular charge transfer interaction. The fluorescence quantum yield depends strongly on the properties of the solvents. Crystalline solids of DPO gave strong red emission at 605nm due to the excitation of molecular aggregates. The absorption and fluorescence emission spectral properties of DPO have also been investigated in organized media of aqueous micellar and β-cyclodextrin (β-CD) solutions. The critical micelle concentrations (CMCs) of SDS and CTAB as well as the binding constants of DPO in micellar solution and β-cyclodextrin have been also determined.

MATERIALS

Product Number

Brand

Product Description

Sigma-Aldrich

4-Ethoxymethylene-2-phenyl-2-oxazolin-5-one, purified by recrystallization

Supelco

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Sigma-Aldrich

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Supelco

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1,4-Dioxane solution, NMR reference standard, 40% in benzene-d₆ (99.6 atom % D), chromium(III) acetylacetonate 5 mg/mL, NMR tube size 5 mm × 8 in.

Sigma-Aldrich

1,4-Dioxane, anhydrous, 99.8%, contains <=25 ppm BHT as stabilizer

Supelco

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Sigma-Aldrich

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