Synthesis, characterization and visible spectral behaviour of some novel methine, styryl and aza-styryl cyanine dyes

Novel monomethine, dimethine, trimethine, styryl and aza-styryl cyanine dyes having naphthfuro [3,2-d]pyrazole nucleus were prepared. The visible spectral behaviour of the synthesized cyanines was examined in 95% ethanol. Structural determinations were carried out via elemental analysis, IR and 1H NMR spectral data.