Eight new bithienyl benzothiazole derivatives 1 were synthesised by reacting various 5-formyl-5´-alkoxy- or 5-formyl-5´-amino-2,2´-bithiophenes 2 with ortho-aminobenzenethiol in good to excelent yields. Compounds 1a-h were completely characterised by spectroscopic methods. Absorption and fluorescence spectra of these compounds were also recorded. In agreement with previous findings concerning the fluorescence studies of 2-(2´-thienyl)-1,3-benzothiazoles, the new compounds prepared can find application for additives in textile dyeing and plastics, tunable dye lasers, biological stains, fluorescent markers, materials science and optoelectronics
