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

684228

Sigma-Aldrich

1,4-Dioxane solution, NMR reference standard, 40% in benzene-d₆ (99.6 atom % D), NMR tube size 10 mm × 8 in.

704814

Sigma-Aldrich

1,4-Dioxane solution, NMR reference standard, 10 mM in D₂O ("100%", 99.96 atom % D), NMR tube size 5 mm × 7 in.

736171

Supelco

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

76887

Supelco

1,4-Dioxane, analytical standard

611905

Sigma-Aldrich

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.

612073

Sigma-Aldrich

1,4-Dioxane solution, NMR reference standard, 40% in benzene-d₆ (99.6 atom % D), chromium(III) acetylacetonate 5 mg/mL, NMR tube size 3 mm × 8 in.

631833

Supelco

1,4-Dioxane solution, NMR reference standard, 5 mM in benzene-d₆ (99.6 atom % D), NMR tube size 3 mm × 8 in.

551368

Sigma-Aldrich

1,4-Dioxane solution, NMR reference standard, 40% in benzene-d₆ (99.6 atom % D)

E0753

Supelco

4-Ethoxymethylene-2-phenyl-2-oxazolin-5-one, analytical standard, for drug analysis

631868

Supelco

1,4-Dioxane solution, NMR reference standard, 5 mM in chloroform-d (99.8 atom % D), NMR tube size 3 mm × 8 in.

862207

Sigma-Aldrich

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

34857

Sigma-Aldrich

1,4-Dioxane, suitable for HPLC, ≥99.5%

D201863

Sigma-Aldrich

1,4-Dioxane, ReagentPlus^®, ≥99%, contains ≤25 ppm BHT as stabilizer

676934

Sigma-Aldrich

1,4-Dioxane, ACS reagent, ≥99.0%

CRM48367

Supelco

1,4-Dioxane solution, certified reference material, 2000 μg/mL in methanol, ampule of 1 mL

360481

Sigma-Aldrich

1,4-Dioxane, ACS reagent, ≥99.0%, contains ≤25 ppm BHT as stabilizer

33147

Sigma-Aldrich

1,4-Dioxane, puriss. p.a., ACS reagent, reag. ISO, reag. Ph. Eur., ≥99.5% (GC)