PRIMARY AND SECONDARY FLUORESCENCE QUENCHING OF $Eu^{3+}$ IN ORGANIC SOLVENTS

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1972

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Ohio State University

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The fluorescence of $Eu^{3+}$ in organic solvents is subject to quenching by the solvent molecules both in the solvation sphere and outside the primary solvation sphere of the complex ion. Binary solvents were employed including $CH_{3}COOH$ and one of the following derivatives of $CH_{3}COOH$, i.e., $CCl_{3}COCl, CF_{3}COOH$, $CHCl_{2}COCl$, $CH_{2}ClCOCl$ $CH_{3}COCl, CD_{3}COOD$, etc. The rare earth salts, $EuCl_{3}$ ${\cdot}$ $6H_{2}O$, are insoluble in the latter solvents and therefore, the primary solvation sphere of the complex ion consists of $CH_{3}COOH$ only. The primary fluorescence quenching, $k_{h}$ is constant in all systems used whereas the secondary fluorescence quenching rate constant, $k^{sec}_{solv}$, varies from solvent to solvent. It increases as the overlap between the normalized fluorescence of $Eu^{3+}, I_{F}(\bar{\nu})$, and the near-infrared spectrum of the solvent ${\epsilon}_{solv}(\bar{\nu})$, increases; i.e., $k^{sec}_{solv} \ \alpha \int I_{F}(\bar{\nu})\ \epsilon_{solv}(\bar{\nu})d{\bar{\nu}}$. This project was supported by Owens-Illinois, Corporate Research Laboratories.

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Author Institution: Department of Chemistry, The University of Toledo

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