Electrochemiluminescence of coumarin derivatives induced by injection of hot electrons into aqueous electrolyte solution

Electrochemiluminescence Study of Europium (III) Complex with Coumarin3‐Carboxylic Acid

“…The electrochemiluminescence of the europium(III) ion is the least known among the lanthanide series [13,19]. Studies being done so far, considering europium chelates with the use of cathodic-generated ECL in aqueous solution, indicate two possible mechanisms of excitation of the Eu(III) ions: (1) in the process of energy transfer from electrochemically exited ligand the Eu(III) ion, or (2) in the electroreduction process of Eu 3+ to Eu 2+ following its oxidation with the use of a strong radical oxidizer generated as a result of decomposition of a coreactant (e.g., S 2 O 8 2− ).…”

“…Under air-saturated solutions, and due to oxygen evolution at the counter electrode, oxyradicals and hydrogen peroxide can be formed, if hydrated electrons are produced at the working electrode [13]. The ECL spectra were recorded in aqueous solution containing: only the coreactant K 2 S 2 O 8 (Figure 5(a)), and Eu 2 (SO 4 ) 3 (as uncomplexed Eu(III)) plus the coreactant K 2 S 2 O 8 (see Figure 5(b)).…”

“…Coumarin derivatives have been a subject of electrochemiluminescence its mechanisms, induced by injection of hot electrons into aqueous electrolyte solution [13]. The studies showed that coumarins can be suitable candidates as ECL labels for bioaffinity assays or other analytical applications [13].…”

Electrogenerated luminescence of chosen lanthanide complexes at stationary oxide-covered aluminium electrode

“…high-voltage electrochemiluminescence with the use of the Al, Mg, or Si electrodes in aqueous solutions are limited to aromatic derivatives of aminocarboxylic acids, porphyrins containing polar peripheral groups [6], and typical chemiluminogenic compounds such as luminol [7] and coumarin derivatives [8].…”

Heterogeneous oligonucleotide-hybridization assay based on hot electron-induced electrochemiluminescence of a rhodamine label at oxide-coated aluminum and silicon electrodes

“…Many common photoluminescent and chemiluminescent luminophores have been detected this way, examples including luminol and its derivatives [10,11], Ru(bpy) 3 2+ [12,13], fluorescein and eosin [14], SYBR (R) Green I [15], coumarine dyes [16], Rhodamine B [17] and terbium chelates [18,19]. The most sensitive HECL luminophores so far are terbium labels, which can be detected down to femtomolar concentration [18,19].…”