The Synthesis and Properties of 3-(2'-Benzothiazolyl)coumarin Fluorescent Dyes for Polyester Fabrics

Fluorescent dyes based on 3-(2'-benzothiazolyl)coumarin were synthesized by a simple condensing reaction in this study. The chemical structures of synthesized compounds were subjected to FT-IR, H-1-NMR, Mass and UV/Vis analysis for color characteristics. Polyester fabrics dyed with the compounds were evaluated by color strength and color fastness to washing, perspiration and light of ISO. The results showed that all dyes decide after identified by IR, MS and H-1-NMR the structure is correct. And then all dyes were used to the dyeing of polyester fabrics. It was clearly that color strength increased with the increasing of the amount of carbon in the 7-position of coumarin ring. The level of color fastness to washing and perspiration were 4-5 or more, while the level of color fastness to light decreased with an increase of carbon chain length.