Abstract
Data on the fluorescence spectra, fluorescence lifetimes, and the temperature dependence of these quantities for the dibenzoylmethane chelates of europium and of terbium in a variety of environments are presented. The effect of the environments studied on the europium chelate is much more pronounced than on the terbium chelate. Lewis bases cause a decrease in temperature dependence of fluorescence in the europium chelate. Quenching of fluorescence takes place through vibronic interaction with the lowest excited (triplet) state of the ligand.

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