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

Abstract

Efficient quenching of Ru(bpy)(3)(2+) (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)(3)(2+), 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.

A Flow-through Electrochemiluminescence Sensor for Salt Stress on Rice Plants

“…This result may be attributable to generation of compounds such as phenol and catechole that decrease the ECL intensity. 16 On the other hand, for IR28 with the ordinary resistance, the proline content and ECL intensity increased till the 8th and 11th days, respectively (Fig. 4).…”

Determination of pentachlorophenol by anodic electrochemiluminescence of Ru(bpy)32+ based on nitrogen-doped graphene quantum dots as co-reactant

“…TCQ belongs to the benzoquinone species, which is well known to be capable of quenching the anodic ECL of Ru(bpy) 3 2+ * via energy transfer. 37 Therefore, the quenching mechanism of PCP on the Ru(bpy) 3 2+ /NGQDs ECL system should be related to the electron transfer between the Ru(bpy) 3 2+ * and TCQ. When PCP and the Ru(bpy) 3 2+ /NGQDs system coexist, the electrons transfer from Ru(bpy) 3 2+ * to TCQ, thus reducing the ECL signal of Ru(bpy) 3…”

Quenching of the Electrochemiluminescence of Tris(2,2′-bipyridine)-ruthenium(II) by Sodium Diphenylamine-4-sulfonate

“…Quenching ECL of the tris(2,2′-bipyridine)ruthenium(II)/ tripropylamine (TPrA) system has been studied quite extensively 10,11 in terms of the mechanism and applications. [4][5][6][7][8][9][10][11][12][13] McCall et al reported on the inhibition of Ru(bpy)3 2+ /TPrA ECL by phenol, substituted phenols, hyroquinones, catechols, and benzoquinones, and suggested a quenching mechanism involving benzoquinone derivatives formed at the electrode surface that quenches ECL via energy transfer.…”