Insights into the electrochemiluminescence process of a hydrogen bonding iridium(III) complex

Liuqing Yang, Ruizhong Zhang*, Barbora Balónová, Allison E. True, Kenneth Chu, Jonathan R. Adsetts, Congyang Zhang, Xiaoli Qin, Eli Zysman-Colman*, Barry A. Blight*, Zhifeng Ding*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Hydrogen-bonding has been reported as a smart strategy in electrochemiluminescence (ECL) mechanism studies and sensing applications. However, the insights into the hydrogen-bonding effect on ECL behavior have never been clearly demonstrated. This work reports ECL of complex 1•3 based on the hydrogen-bonding interaction between an IrIII complex (1) and pyrimido-[4,5-c]isoquinolin-3-amine (3). In their cyclic voltammograms (CVs), both complex 1 and compound 3 did not show any reductions; however, the hydrogen-bonding complex 1•3 displayed a new reduction upon the mixture of 1 and 3, which could be significantly weakened by the addition of DMF. In a co-reactant ECL pathway with BPO, exciplex [PhCO2•1] and excimer [3•3] were produced, which were demonstrated by PL and ECL spectroscopies. Furthermore, benzoate radical PhCO2 could also react with the hydrogen-bonding complex 1•3 to form [PhCO2•1•3] and generate the same ECL emission as [PhCO2-1]. Our report provides insights into the ECL processes of this hydrogen-bonding complex.
Original languageEnglish
Article number116594
Number of pages7
JournalJournal of Electroanalytical Chemistry
Volume920
Early online date12 Jul 2022
DOIs
Publication statusPublished - 1 Sept 2022

Keywords

  • Electrochemiluminescence
  • Hydrogen bonding
  • Iridium(III) complex
  • Exciplex
  • Excimer

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