Syntheses of some novel dichromophoric cyanine dyes based on 2-aminobenzothiazoles have been reported.
Their highly extended conjugated systems are in symmetrical and unsymmetrical structures, both of which are divided
into two electron-rich and electron-poor series. The sixteen synthesized compounds absorb visible light in the region of
462-523 nm in ethanol in deep orange, red and purple color with high molar absorption coefficients ( : 2.1 – 4.4 104
M1.cm1). Besides the study of their electronic spectroscopic properties, broad solvatochromic effects have been observed
70-200 nm shifts in nine different solvents. In fluorescence spectroscopic studies, their emissions have been observed
to be 400–500 nm at excitation wavelengths 347-375 nm in DMF.
Keywords: Aminobenzothiazole, antibacterial effect, bis-azo, polyene dyes, solvatochromic effect
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