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Solution Chemistry of Europium(III) Aqua Ion at Micromolar Concentrations as Probed by Direct Excitation Luminescence Spectroscopy
Author(s) -
Andolina Christopher M.,
Mathews Ryan A.,
Morrow Janet R.
Publication year - 2009
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.200900166
Subject(s) - europium , chemistry , luminescence , perchlorate , spectroscopy , aqueous solution , hydroxide , inorganic chemistry , quenching (fluorescence) , chloride , fluorescence spectroscopy , excitation , ion , fluorescence , organic chemistry , physics , optoelectronics , quantum mechanics , electrical engineering , engineering
Direct excitation europium(III) luminescence spectroscopy is used to study the speciation of aqueous europium(III) ions at micromolar concentrations and near neutral pH. The pH and concentration dependence of the europium(III) 7 F 0 → 5 D 0 excitation peak is consistent with the formation of both mononuclear and dinuclear europium(III) hydroxide complexes at pH 6.5. Luminescence intensity and lifetime quenching studies in the presence of Nd III at pH 5.0 and 6.5 support the formation of a dinuclear complex at pH 6.5. Steady state excitation and time‐resolved luminescence spectroscopy are consistent with the formation of innersphere nitrate and fluoride complexes, but outersphere perchlorate and chloride complexes at pH 6.5 and 5.0.