Photophysical Responses of Benzimidazolic and Benzoxazolic HydroxyCoumarin Dyes

Nourmohammadian, F.; Habibi, A.; Nazari, F.; Ashtiani Abdi, A.; Sadeghi-Kiakhani, M.; Abbasi, R.

doi:10.30509/pccc.2015.75863

Photophysical Responses of Benzimidazolic and Benzoxazolic HydroxyCoumarin Dyes

Authors

¹ Department of Organic Colorants, Institute of Color Science and Technology

² Department of Chemistry, University of Tarbiat moallem

³ Department of Organic Colorants, Institute for Color Science and Technology, Tehran, Iran

⁴ Department of Organic Colorants, Institute for Color Science and Technology

10.30509/pccc.2015.75863

Abstract

We synthesized four novel benzoxazolic and benzimidazolic derivatives of 6-hydroxycoumarin and their photophysical properties were studied. The products with brilliant yellow color shades declared green fluorescence. The emission peaks of the products appeared 456–474 nm. The important characteristic for fluorescent compounds, the Stokes shift νA-νF, oscillator strength f, and fluorescence quantum yield ΦF were measured. Furthermore, their photophysical and electronic properties have been investigated at the theoretical level using density functional theory. Dyeing of nylon fabrics was carried out by the synthesized fluorescent dyes as well. They generally flatten off at dye concentrations of 2-3 owf.

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