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Energy Transfer Quenching Antenna Complexes

Gunnlaugsson and co-workers have also studied di-eiuopium(III) complex 123, which incorporates two different macrocyclic ligands for Eu(III) in addition to a covalently bound antenna group [86]. Upon titrating 123 with acetate, aspartate and succinate at pH 6.5, each of the Eu(III) emission bands was quenched by up to 50% for acetate and aspartate. Malonate, however, produced a nearly two-fold enhancement in the emission intensity. It is thought that this particular anion is able to displace coordinated water molecules from both the Eu(III) centres thereby reducing the rate of non-radiative energy transfer. [Pg.88]

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Antenna complexes

Antennae

Complex energy

Quenching complexes

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