Synthesis and Characterization of New γ-Substituted Pentamethine Cyanine Dyes

Abstract

Three novel pentamethine cyanine dyes with 3,5-dimethylpyridinium-1-yl and 4-benzylpyridinium-1-yl substituents in γ position of the methine chain were synthesized via a three-step procedure. The visible spectral behavior of these pentamethine 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.

Keywords:

• 4-Benzylpyridinium-1-yl
• 3,5-dimethylpyridinium-1-yl
• pentamethine cyanine dyes
• γ-substitute