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oai:ojs.www.eurjchem.com:article/1033 2014-09-30T03:41:50Z eurjchem:ART driver

Effects of chemical structure, solvent and solution pH on the visible spectra of some new methine cyanine dyes Shindy, Hassan Abazied El-Maghraby, Mohamed Abdalla Eissa, Fayez Mohamed Synthesis Cyanine dyes Absorption spectra Acid-base properties Dimethine cyanine dyes Solvent effect on spectra Some new dimethine and bis-dimethine, cyanine dyes derived from benzo[2,3-b; 2`,3`-b`]bis-pyrazolo[4,5-b]-l,4-(oxa-, thia-, and pyra-)-zine-6,12-dione were synthesized. Effect of chemical structure on the electronic visible absorption spectra of all the synthesized cyanine dyes was investigated in 95% ethanol solution. Effects of solvent and/or solution pH on the electronic visible absorption spectra of some selected synthesized cyanine dyes were also examined in pure solvents having different polarities and/or in aqueous universal buffer solutions, respectively. Structural confirmations were carried out through elemental analysis, mass spectroscopy, IR and 1H NMR spectra. Atlanta Publishing House LLC 2014-09-30 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/1033 10.5155/eurjchem.5.3.451-456.1033 European Journal of Chemistry; Vol. 5 No. 3 (2014): September 2014; 451-456 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/1033/pdf_1033