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Generation of free radicals and electrochemiluminescence from simple aromatic molecules in aqueous solutions
Author(s) -
AlaKleme Timo,
Kulmala Sakari,
Jiang Qinghong
Publication year - 2006
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.895
Subject(s) - electrochemiluminescence , benzene , chemistry , aniline , aqueous solution , electrolyte , phenol , photochemistry , electrode , radical , inorganic chemistry , toluene , organic chemistry
Oxide‐covered aluminium electrodes were used to demonstrate that aromatic compounds, such as the simple derivatives of benzene, can be electrochemically excited at cathodically pulse‐polarized conductor/insulator/electrolyte (C/I/E) tunnel junction electrodes (e.g. oxide‐covered aluminium electrodes). The primary cathodic process at these electrodes was a tunnel emission of hot electrons into an aqueous electrolyte solution. Fluorescence (FL) and electrochemiluminescence (ECL) spectra were compared and the dependence of the electrochemiluminescence on the concentrations of benzene, toluene, phenol, p ‐cresol and aniline were measured and detailed mechanisms for the present electrochemiluminescence are proposed. Copyright © 2006 John Wiley & Sons, Ltd.