39 research outputs found

    Der altägyptische Orden der goldenen Fliege

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    Rundschau

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    Fluorescence properties and stimulated emission in substituted europium chelates

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    Benzoyltrifluoroacetone was mono-substituted by F, Cl and Br in the ortho-, meta- and para-position of the benzene ring. The nine substituted ligands were used to prepare the tetrakis Eu(III) chelates. Fluorescence and absorption were studied. In general, it was found that ortho-substitution reduces the threshold energy for stimulated emission

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