Quenching of Electrogenerated Chemiluminescence by Phenols, Hydroquinones, Catechols, and Benzoquinones

Abstract

Efficient quenching of Ru(bpy)32+ (bpy = 2,2‘-bipyridine) electrogenerated chemiluminescence has been observed in the presence of phenols, catechols, hydroquinones, and benzoquinones. In most instances, quenching is observed with 100-fold excess of quencher over Ru(bpy)32+, with complete quenching observed between 1000- and 2000-fold excess. The mechanism of quenching is believed to involve energy transfer from the excited-state luminophore to benzoquinone. In the case of phenols, catechols, and hydroquinones, quenching is believed to occur via a benzoquinone derivative formed at the electrode surface. Photoluminescence and UV−visible experiments coupled with bulk electrolysis support the formation of benzoquinone products upon electrochemical oxidation.

Department(s)

Chemistry and Biochemistry

Document Type

Article

DOI

https://doi.org/10.1021/ac981322c

Keywords

hydrocarbons, photoluminescence, aromatic compounds, electrolysis, quenching

Publication Date

5-15-1999

Journal Title

Analytical chemistry

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