Synthesis and Visible Spectra Studies of Novel Pyrazolo/Oxazole Merocyanine Dyes

Abstract

Novel acyclic merocyanine dyes and cyclic merocyanine dyes derived from the nucleus of furo[(3,2-d)pyrazole;(3',2'-d)oxazole] were prepared. The electronic visible absorption spectra of all the new synthesized acyclic and cyclic merocyanine dyes were examined in 95 % ethanol solution to evaluate their spectral sensitization properties. Studying the electronic visible absorption spectra of cyanine dyes in 95 % ethanol solution have a great practical value and is very important study in the case of cyanine dyes because the extensive uses and applications of these dyes as photographic sensitizers for silver halide emulsion in photosensitive material industry for coloured and non coloured (black and white) films (cyanine dyes were originally used, and still are, to increase the sensitivity range of photographic emulsions, i.e. to increase the range of wavelengths which will form an image on the film). Structural characterization and identification was carried out via elemental analysis, visible spectra, mass, IR and 1 H NMR spectroscopic data.