Electrogenerated chemiluminescence. 30. Electrochemical oxidation of oxalate ion in the presence of luminescers in acetonitrile solutions

Abstract

If there is a complex formed between TPTA and aromatic hydrocarbons in the ground state, there will be a potential shift in the reduction potential of aromatic hydrocarbons. This shift, however, was not significant even in good donor-acceptor pairs, such as the TPTA-benzophenone system. This assumption must therefore be valid. See ref 14.(34) J. T. Bowman and A. Abstract:The electrochemical oxidation of oxalate at a platinum electrode in acetonitrile solutions as studied by cyclic and rotating-ring disk voltammetry and controlled potential coulometry shows an irreversible two-electron oxidation at ca. 0.3 V vs. SCE to CO2 with no intermediates detectable by these techniques. The oxidation of oxalate in the presence of several fluorescers (such as rubrene, 9, IO-diphenylanthracene, and the bipyridyl chelates of ruthenium(l1) and osmium(l1)) does not produce light, but emission characteristic of the fluorescer occurs during the simultaneous oxidation of the additive and oxalate. Studies of the conditions for emission in the presence of thianthrene and naphthalene lead to a mechanism for the oxidation of oxalate and the excitation process based on oxidation of oxalate to CzO4-., which undergoes rapid decomposition to COz and C02--. The C02-e can transfer an electron to the additive molecule to produce a radical anion, which can then undergo an ecl annihilation reaction with the electrogenerated radical cation.

Electrochemiluminescence of Tris(2,2′‐bipyridine)ruthenium with Various Co‐reactants under Ultrasound Irradiation

“…) is the most widely used ECL emitter among various ECL systems because this complex is capable of producing ECL with various coreactants, such as tripropylamine (TPA), oxalate ion (C 2 O 4 2-) [5,6], peroxydisulfate [7,8], and ascorbic acid [9][10][11]. Ru(bpy) 3 2+ based ECL system can emit light at room temperature in both aqueous and non-aqueous solutions with relatively higher ECL efficiency.…”

Imaging Analysis Based on Electrogenerated Chemiluminescence

“…In general, the co-reactants can be classified into two categories, namely, ''oxidative-reductive'' co-reactants and ''reductive-oxidative'' ones. The first coreactant, oxalate (C 2 O 4 2-), was reported by Bard's group in 1977 [47], and it is a typical example of ''oxidativereductive'' one. Taking C 2 O 4 2-as the co-reactant of Ru(bpy) 3 2?…”

A Review of Electrogenerated Chemiluminescent Biosensors for Assays in Biological Matrices

“…2+ coreactant ECL process The ECL reactions of RuL 3 2+ species have been studied since the 1970s [5][6][7][8]. In a deaerated aprotic solvent, RuL 3 2+ can be both oxidized and reduced at an electrode (Equations 1-2).…”

“…Early reports of ECL-based detection methods were primarily for small molecules [5][6][9][10][11][12][13][14][15]. However, many of these methods lacked specificity and required a separation step prior to detection [14,15].…”