A Mechanistic Study of Terbium Phosphorescence Quenching

• Autores: Judith L. Jenkins, Lawrence E. Welch
• Localización: Journal of chemical education, ISSN 0021-9584, Vol. 86, Nº. 5 (May), 2009, págs. 613-616
• Idioma: inglés
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• Resumen

  • An EDTA complex of terbium(III) was evaluated via phosphorescence spectroscopy in the presence of varying quantities of quencher TEMPOL. Both steady-state excitation via a xenon lamp and pulsed excitation via a nitrogen laser were used to allow the quenching to be evaluated both on the basis of phosphorescence intensity and phosphorescence lifetime. By coupling this information with experimental repeats done at differing temperatures, the students can compare their data with the behavior predicted for several model quenching modes, gaining mechanistic information in the process. Because of the long phosphorescence lifetime of the terbium complex, this experiment is more broadly accessible than most quenching experiments.