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  Home > JCE Print > Journal of Chemical Education > Issues > 2009  > May  >
In the Laboratory
A Mechanistic Study of Terbium Phosphorescence Quenching
Judith L. Jenkins and Lawrence E. Welch
Department of Chemistry, Knox College, Galesburg, IL 61401
Cover
May 2009
Vol. 86 No. 5
p. 613

Abstract
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.
Supplement
Quenching principles; Instructor notes; Student handouts
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Contents
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Citation
Jenkins, Judith L.; Welch, Lawrence E. J. Chem. Educ. 2009, 86, 613.
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Keywords
Analytical Chemistry; Hands-On Learning / Manipulatives; Instrumental Methods; Kinetics; Laboratory Instruction; Physical Chemistry; Problem Solving / Decision Making; Spectroscopy; Upper-Division Undergraduate
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History
Created:
Last Updated:
3/17/2009
4/1/2009
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Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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