Synthesis, photosensitization and antimicrobial activity of certain oxadiazine cyanine dyes

New heterocyclic compounds having 1,3,4-oxadiazine nuclei were prepared and employed for the synthesis of some new photosensitizers cyanine dyes. The electronic visible absorption spectra of all the synthesized cyanines were investigated in 95% ethanol. Antimicrobial activity of selected compounds against some bacterial strains was tested. Structural identification was carried out via elemental and spectroscopic analyses.