Novel pyrazolo pyrazoly heterocyclic in the synthesis of positive solvatochromic cyanine dyes

Novel cyanine dyes monomethine, bismonomethine and trimethine cyanine dyes were synthesized from 5-hydroxy-2-(5-hydroxy-3-methyl-1-phenyl-4,5-dihydro-1H-pyrazol-4-yl)-3-methyl-1-phenyl-4,5-dihydro-1H-pyrazol-2-ium as a nucleus. Structure confirmed by elemental analysis, IR, 1H-NMR, mass and visible was determined. The electronic visible absorption spectra of all the newly synthesized cyanine dyes were investigated in 95% ethanol solution. Solvatochromism for the newly prepared cyanine dyes were performed in pure solvents having different polarities.