New methine cyanine dyes covering monomethine cyanine dyes and dimethine cyanine dyes derived from benzo [(2,3-b)benzoxazine; (2,3-e)1,3,4-oxadiazine]-5,12-dione were prepared. The electronic visible absorption spectra of all the synthesized cyanine dyes were investigated in 95% ethanol solution. Biological activity for a number of selected compounds was tested and evaluated against various bacterial strains (Bacillus subtilis, Escherichia coli, Pseudomona aeruginosa and Staphylococcus aureus). Structural determination was carried out via elemental analysis, visible, mass, IR and 1 H NMR spectroscopic data.
Novel carbocyanine dyes (trimethine cyanine dyes) and bis-carbocyanine dyes (bis-trimethine cyanine dyes) derived from the nucleus of benzo[2,3-b; 2',3'-b'] bis-furo[2,3-d]imidazoline-3,5,8,10-tetra one were synthesized. The electronic visible adsorption spectra of all the synthesized cyanine dyes were investigated in 95% ethanol solution. Solvatochromism and/or halochromism for some selected dyes were examined in pure solvents having different polarities (water, dimethylformamide, ethanol, chloroform, carbontetrachloride and dioxane) and/or in aqueous universal buffer solutions owing varied pH values (1.45, 2.03, 3.72, 5.09, 7.57, 8.91, 10.20 and 12.04 units), respectively. Structural confirmations were determined by elemental analysis, visible, mass, IR and 1H NMR spectral data.
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