Electrochemiluminescence and analytical applications of terbium thiophene carboxylic acid complexes

Abstract

In this work, the electrogenerated chemiluminescence (ECL) behavior of a lanthanide Tb(III) complex was studied using thiophene carboxylic acid (3-thiophenecarboxylic acid, 3-TCA) as the ligand and triethanolamine (TEOA) as the co-reactant.

Electrochemistry and Electrochemiluminescence of Coumarin Derivative Microrods: Mechanism Insights

“…Besides the TEOA oxidation peak, C545T MRs/GCE also displayed a sharp oxidation peak of C545T MRs at +1.20 V, and the anodic ECL of C545T MRs/GCE emerged at around +0.80 V and displayed three peaks at around +0.98, +1.16, and +1.50 V (Figure A,B). The oxidation of TEOA could produce TEOA •+ and then a strong reducing agent TEOA • by deprotonation, which could inject electrons into the oxidized C545T MRs (C •+ , C •2+ , or C •3+ ) to produce the excited state C* for ECL. , In the successive anodic scanning cycle, ECL emission moved toward a more positive potential and the ECL intensity tended to be stable (Figure S9). Thus, 0.0 to +1.50 V was set as the optimal potential window in the next measurement.…”

“…Then, the ECL of C545T MRs in the anode region with TEOA was also studied. TEOA exhibited a strong oxidation current on the bare GCE between 0.0 and +1.70 V with an onset voltage of about +0.70 V, 43 but no ECL emission was detected (Figure 5A,B, the black line). Besides the TEOA oxidation peak, C545T MRs/GCE also displayed a sharp oxidation peak of C545T MRs at +1.20 V, and the anodic ECL of C545T MRs/GCE emerged at around +0.80 V and displayed three peaks at around +0.98, +1.16, and +1.50 V (Figure 5A,B).…”

“…The oxidation of TEOA could produce TEOA •+ and then a strong reducing agent TEOA • by deprotonation, which could inject electrons into the oxidized C545T MRs (C •+ , C •2+ , or C •3+ ) to produce the excited state C* for ECL. 43,44 In the successive anodic scanning cycle, ECL emission moved toward a more positive potential and the ECL intensity tended to be stable (Figure S9). Thus, 0.0 to +1.50 V was set as the optimal potential window in the next measurement.…”

From glow-sticks to sensors: single-electrode electrochemical detection for paper-based devices

“…Alternatively, electrochemiluminescence (ECL, also known as electrogenerated chemiluminescence) has emerged as one of the simplest, most sensitive, and versatile detection platforms that has been applied for a wide range of analytes. [21][22][23][24] ECL refers to the electrochemical generation of species (i.e. a luminophore and co-reactant) that then react to form secondary species in excited states which finally decay and emit light.…”