A series of chemiluminescence (CL) investigations of rare earth ions in redox reactions has been initiated. The study of oxidation reactions of Eu 2+ -uncomplexed and complexed by ethylenediaminetetraacetic acid (EDTA) -with H 2 0 2 has revealed a distinct CL of Eu 3+ with two-phasic kinetics, controlled by pH and the concentration of H 2 0 2 .

Abstract— Chemiluminescence of the Eu(II)/Eu(III)‐adenine nucleotide‐H2O2 system and fluorescence of the Eu(III)‐adenosine triphosphate system have been investigated. The spectral distribution of the chemiluminescence emission has shown an occurrence of three main bands (Λ=470–480,590–620 and ca. 700 nm). The energy transfer process from the adenosine triphosphate molecules to the Eu(III) ions has been observed in the fluorescence spectrum. The examined chemiluminescence and fluorescence spectra show that these both kinds of emission originate from the 5D***τ7F*** (n=1–4) transitions in the Eu(III) ions.

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