Syntheses, Absolute Configurations, and UV/Vis Spectroscopic Properties of New Chiral Tri- and Pentamethinium Streptocyanine Dyes with 4-Aminophenyl 4-Methylphenyl Sulfoxide Endgroups
pentamethinium streptocyanine dyes 11−13, with sulfonyl moieties instead of sulfinyl groups in the two endgroups, were synthesized from 4-aminophenyl 4-methylphenyl sulfone (10). The UV/Vis spectroscopic and chiroptical properties of the new polymethinium streptocyanine dyes have been studied.