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Highly Efficient Electrochemiluminescence of Functionalized Tris(2,2′‐bipyridyl)ruthenium(II) and Selective Concentration Enrichment of Its Coreactants
Author(s) -
Xu Y.,
Gao Y.,
Li T.,
Du Y.,
Li J.,
Wang E.
Publication year - 2007
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200600537
Subject(s) - electrochemiluminescence , ruthenium , ionic liquid , indium tin oxide , electrode , glassy carbon , materials science , inorganic chemistry , ruthenium oxide , tetrafluoroborate , tris , adsorption , surface modification , electrochemistry , catalysis , chemistry , cyclic voltammetry , organic chemistry , biochemistry
An enhanced electrochemiluminescence (ECL) efficiency is obtained from the ruthenium complex tris(2,2′‐bipyridyl)ruthenium(II) (Ru(bpy) 3 2+ ) by introduction of an ionic liquid (IL) 1‐butyl‐3‐methylimidazolium tetrafluoroborate (BMImBF 4 ). Upon addition of 1 % (v/v) BMImBF 4 to 0.1 m M Ru(bpy) 3 2+ solution, a maximum increase in ECL intensity is obtained both at an indium tin oxide (ITO) electrode (15‐fold) and at a glassy carbon (GC) electrode (5‐ to 6‐fold). Furthermore, upon addition of 1 % (v/v) BMImBF 4 to 5 μ M Ru(bpy) 3 2+ /100 m M co‐reactant systems at a GC electrode, IL adsorption occurs at the electrode surface, which results in a change of the polarity of the electrode surface. Such functionalization greatly improves the functions of both Ru(bpy) 3 2+ and ionic liquids, as is demonstrated in the sensitive and selective concentration enrichment of the Ru(bpy) 3 2+ co‐reactants.