Dansyl - Substituted Aza Crown Ethers: Complexation with Alkali, Alkaline Earth Metal Ions and Ammonium

Nelly Mateeva, Shihab Deiab, Edikan Archibong, Donka Tasheva, Bereket Mochona, Madhavi Gangapuram, Kinfe Redda

Abstract


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text-indent:-1.0in;} @list l10:level8 {mso-level-legal-format:yes; mso-level-text:"%1\.%2\.%3\.%4\.%5\.%6\.%7\.%8"; mso-level-tab-stop:1.25in; mso-level-number-position:left; margin-left:1.25in; text-indent:-1.0in;} @list l10:level9 {mso-level-legal-format:yes; mso-level-text:"%1\.%2\.%3\.%4\.%5\.%6\.%7\.%8\.%9"; mso-level-tab-stop:1.5in; mso-level-number-position:left; margin-left:1.5in; text-indent:-1.25in;} ol {margin-bottom:0in;} ul {margin-bottom:0in;} --> The present study investigates the binding properties of four dansyl substituted aza-crown ethers with alkali, alkaline earth metal ions and ammonium. The influence of the solvent polarity and protonation on the photophysical properties of the compounds was studied by UV/Vis and fluorescence methods. The host species caused only slight changes on the absorption spectra of the ligands. The fluorescence changes were more pronounced and concentration dependent thus allowing to calculate the binding constants of the process. The most stable complex under our working conditions was the one between Ba2+ and DNS18C6.

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International Journal of Chemistry   ISSN 1916-9698 (Print)   1916-9701 (Online)

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