Synthesis, physiochemical and optical properties of chitosan based dye containing naphthalimide group

► Synthesis of chitosan based dye containing naphthalimide group by a greener approach. ► Physiochemical characterization of different techniques of chitosan biopolymer dye. ► The solubility of material in different organic and inorganic solvents. ► UV-vis and photoluminescence showed red shift.