Abstract
Excited state intramolecular proton transfer (ESIPT) core containing, two series of benzothiazole and benzimidazole based fluorescent acid azo dyes were synthesized. These dyes analyzed and confirmed by 1H NMR, 13C NMR, FT-IR and elemental analysis. Spectral characteristics of these dyes studied in different polarity solvents showed Stokes shift 2888–4678 cm–1 and 2167–4837 cm–1 for benzimidazole and benzothiazole series, respectively. Wool and silk fabric dyed with these dyes, shows 92.1–94.4% (benzimidazole) and 92.4–95.1% (benzothiazole) percentage exhaustion on wool. The dyed substrate evaluated for UV rays protective properties, antibacterial activity light, wash and rubbing fastness. Synthesized dyes show significant antibacterial activity when tested by Agar-well diffusion test against Staphylococcus aureus (Gram positive), Klebsiella pneumonia (Gram negative) bacteria.
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