Electrode modified with ionic liquid covalently bonded to silicate matrix for accumulation of electroactive anions

A thin silicate film containing imidazolium cationic groups surface was obtained by sol-gel processing of ionic liquid - 1-methyl-3(3-trimethoxysilylpropyl)imidazolium bis(trifluoromethyl-sulfonyl)imide together with tetramethyl orthosilicate on the indium tin oxide electrode. The formation of silicate film was confirmed by FTIR spectroscopy. This electrode when immersed into aqueous solution act as a sponge for Fe(CN)(3-)(6) dissolved in aqueous solution. The corresponding voltammetric peak current is by almost two orders of mag nitude larger than for electrode covered by ionic liquid precursor only. The repelling of Ru(NH3)(3+) (6) cations by this electrode is also demonstrated. (C) 2007 Elsevier B.V. All rights reserved.