Synthesis and Characterization of β- substituted Trimethine Cyanine Dyes

Cyanine dyes and their derivatives constitute an important class of organic compounds, which possess numerous applications in many areas (chemistry, physics, biology, etc.) [1–2]. seven novel trimethine cyanine with various substituents in βposition of the methine chain were synthesized via a three-step procedure with1-metheyl -2- phenyl-1H-indole and 2- Heteroaryl-substituted trimethinium salts. The visible spectral behavior of these trimethine cyanine dyes was examined in DMSO. Elemental analysis, IR, 1H-NMR, 13C-NMR, and mass spectral data confirmed the molecular structure of the newly synthesized compounds.