Oxonium heterocyclic quinone in the synthesis of some cyanine dyes and their antimicrobial activity

The motivation of the synthetic process of new heterocyclic cyanine dyes is to improve the specific characterization, photosensitization behavior, and probable application in the field of biology, medical science and physics. New heterocyclic compounds having oxonium nuclei were prepared and employed for the synthesis of some new photosensitizers cyanine dyes (monomethine, trimethine and styryl cyanines). The electronic visible absorption spectra of all the synthesized cyanines were investigated in 95% ethanol to attempt and throw some light on the influence of such new heterocyclic nuclei and to compare or evaluate spectral behaviors. Antimicrobial activity of selected compounds against some bacterial strains was tested. Structural identification was carried out via elemental analysis, IR and 1H NMR