Synthesis, spectroscopic and antimicrobial studies of some novel cyanine dyes based on bis-coumarin heterocycles derivatives

Novel symmetrical and unsymmetrical cyanine dyes, incorporating merocyanine monomethine like, pentamethine cyanine, monomethine-meso-substituted-pentamethine and mono-5[2(4)]-methine cyanine dye have been prepared through the synthesis of new starting compound derivatives named as 1,3-bis-(2-oxo-2H-chromen-3-yl) propane-1,3-dione and (3-oxo1,3-bis(2-oxo-2H-chromen-3-yl)prop-1-enyloxy) copper, cobalt and nickel chloride salt complexes. Structure determination of the new compounds has been characterized on the basis of elemental analysis, IR, 1H NMR and MS spectra. Structure photosensitization relationship of new dyes have been discussed on the basis of their spectral behavior as criteria of photosensitizing effect through the UV visible-absorption spectra of all synthesized dyes which investigated in 95% ethanol. Antimicrobial properties of some selected cyanine dyes have been investigated against Streptococcus sp, Staphylococcus sp, Salmonella sp. and Shigella sp