Influence of N3- Ions on Chemiluminescence of the Eu(II)/Eu(III)-H2O2 System

M. Elbanowski, K. Staninski, M. Kaczmarek and S. Lis Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780 Poznań, Poland

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The basic system of chemiluminescence investigations of relevant biological and inorganic compounds consists of Eu(II)/Eu(III) - H2O2. In these studies the increase in Eu(III) ion emission intensity usually results from an effective complexation reaction. In the present study, the N3¯ ions are used as a ligand. The increase in the chemiluminescence intensity of the Eu(III) ion, the pH influence (in the range of 4.5-7.5) on the chemiluminescence intensity of the Eu(III) ion, as well as the quenching of the 5D0 excited state of the Eu(III) ion are observed due to N3¯ complexation. Taking into account the well-known Fenton system [Fe(II)/Fe(III) - H2O2], containing additionally the N3¯, Eu(III) or Sm(III) ions, we found that the Eu(III) or Sm(III) ions were excited as a result of energy transfer process. A mechanism of the studied reactions is proposed.

DOI: 10.12693/APhysPolA.90.101 PACS numbers: 78.60.Ps, 78.55.-m