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.

MATERIALI

Numero di prodotto

Marchio

Descrizione del prodotto

360481

Sigma-Aldrich

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

34857

Sigma-Aldrich

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

676934

Sigma-Aldrich

1,4-diossano, ACS reagent, ≥99.0%, contains <=25 ppm BHT as stabilizer

76887

Supelco

1,4-diossano, analytical standard

CRM48367

Supelco

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

862207

Sigma-Aldrich

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

551368

Sigma-Aldrich

1,4-Dioxane solution, suitable for 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

736171

Supelco

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

704814

Sigma-Aldrich

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

684228

Sigma-Aldrich

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

612073

Sigma-Aldrich

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

611905

Sigma-Aldrich

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

631868

Supelco

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

631833

Supelco

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