“…Along with such simple dyes, a number of bichromophoric dyes were synthesized (e.g., biscyanine dyes [1]), which possess interesting photochemical properties different from those of simple dyes. In the three recent decades, two new classes of bichromophoric cyanine dyes were obtained, ketocyanines [2,3,4] and cationanionic dyes [5]. Ketocyanine dyes (polyenic bis-ω, ωaminoketones) consist of two ω-aminopolyenic units bound to the central carbonyl group; cation-anionic dyes contain in their structure cationic and anionic polymethine dyes.…”