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

Abstract

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-2 H -chromen-3-yl) propane-1,3-dione and (3-oxo1,3- bis (2-oxo-2 H -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, 1 H 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 .