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Enhanced Luminescence of Lanthanides: Determination of Europium by Enhanced Luminescence
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Abstract
An experiment has been developed to teach the principles of molecular luminescence spectroscopy. This laboratory experiment is designed for upper-level undergraduates as a less toxic alternative to current fluorescence experiments. It combines elements of physical and inorganic as well as analytical chemistry. The experiment can be performed on a variety of rudimentary fluorescence instrumentation and still give good analytical figures of merit. The object of the experiment is to measure the luminescent enhancement that is achieved when a lanthanide such as Eu(III) or Tb(III) is complexed with appropriate organic ligands, in this case 2,6 pyridinedicarboxylic acid. The importance of pH on metal ion coordination is also explored via luminescence intensity. This approach provides several advantages over current luminescence experiments. These advantages include limited toxicity and flammability of the chemicals involved, a large luminescence linear dynamic range, and low detection limits (parts per trillion). These low detection limits, achieved using modest equipment, allow the determination of the europium concentration in a variety of samples, such as tap water. The narrow lanthanide luminescent bands also permit incorporation of qualitative analysis of a mixture of lanthanides.
Keywords (Audience):
Upper-Division UndergraduateKeywords (Domain):
Analytical ChemistryKeywords (Pedagogy):
Hands-On Learning / ManipulativesKeywords (Subject):
Laboratory Equipment / ApparatusCiting Articles
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This article has been cited by 5 ACS Journal articles (5 most recent appear below).
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Medium Effects on the Stability of Terbium(III) Complexes with Pyridine-2,6-dicarboxylate
Guilford Jones II and Valentine I. VullevThe Journal of Physical Chemistry A2002 106 (35), 8213-8222Medium Effects on the Stability of Terbium(III) Complexes with Pyridine-2,6-dicarboxylate
Guilford Jones II and Valentine I. VullevThe Journal of Physical Chemistry A2002 106 (35), 8213-8222Systematic investigation of the stability of mono-, bis-, and tris-terbium(III) complexes with dipicolinic acid is reported. The formation constants were extracted from emission titration data. For this purpose, a mathematical formalism for two ...
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- Received: August 03, 2009
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