Quenching of Electrogenerated Chemiluminescence by Phenols, Hydroquinones, Catechols, and Benzoquinones
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.
hydrocarbons, photoluminescence, aromatic compounds, electrolysis, quenching
McCall, J., C. Alexander, and M. M. Richter. "Quenching of electrogenerated chemiluminescence by phenols, hydroquinones, catechols, and benzoquinones." Analytical chemistry 71, no. 13 (1999): 2523-2527.