Effect of Halogenation on Intramolecular Energy Transfer in Rare Earth Chelates

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概要

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• Using tris-dibenzoylmethanates of terbium(III) and other rare earths(III) we investigated the effect of halogenation of the central hydrogen of a 1,3-diketonate ligand on the luminescence properties of these chelates in rigid media. As a result of halogenation, all chelates display blue shift of the ligand phosphorescence, the intensity of the rare earth emission <I>I</I><SUB>RE</SUB> relative to that of the phosphorescence <I>I<SUB>ph</SUB></I> is markedly decreased in the order of H→Cl→Br, and the lifetime of the phosphorescence τ<I><SUB>ph</SUB></I> decreases in the same order. These facts provide the evidence that the intramolecular energy transfer takes place <I>via</I> the triplet state of the ligand. In halogenated and nonhalogenated terbium chelates the ratio of the probability of energy transfer <I>P<SUB>t</SUB></I> estimated from the quantity <I>I</I><SUB>RE</SUB>⁄<I>I<SUB>ph</SUB></I>τ<I><SUB>ph</SUB></I> to the overlap integral <I>S</I> between the phosphorescence spectrum and the terbium absorption spectrum is found to be roughly constant. These results lead us to the conclusion that intramolecular energy transfer is governed by the resonance mechanism due to exchange interaction.

• 公益社団法人 日本化学会の論文

著者

• MORITA Makoto

  The Institute for Solid State Physics, The University of Tokyo

関連論文

• Luminescence from Superexchange-Coupled Cr^ Ion Pair in Binuclear Complex Salts. : II. Theoretical Considerations
• Luminescence from Superexchange-Coupled Cr^ Ion Pair in Binuclear Complex Salts. : I. Spectroscopic Investigation
• Effect of Halogenation on Intramolecular Energy Transfer in Rare Earth Chelates

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