Streptocyanine dyes are photo-sensitive compounds with applications in photographic materials. The particular series of aminopentadienylideneammonium salts I synthesized are also useful as anthelmintics, which are de-worming agents, for livestock. The series I prepared differed only in the N-substituents and the anions. Compounds were then characterized by melting point, ultraviolet-visible spectrophotometry, and fluorescence spectrophotometry. Two of the compounds appear to be ionic liquids at room temperature, and nuclear magnetic resonance spectra suggest that water induces crystallization in these compounds. A variety of methods to purify the compounds were employed, and several of the compounds would not crystallize, even though literature suggested that they would. The final characterization of these dyes shows clear, if not predictable, trends in the effect of varying N-substituents and anions.
Teresa Beary, ’08 Lovilia, IA
Sponsor: Charles Liberko