Ion transfer processes at ionic liquid based redox active drop deposited on an electrode surface

Niedziolka, Joanna; Roźniecka, Ewa; Stafiej, J.; Sirieix-Plénet, Juliette; Gaillon, Laurent; Caprio, Dung Di; Opałło, Marcin

doi:10.1039/b502194d

Cited by 37 publications

(48 citation statements)

References 27 publications

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“…This is quite below unity and can be explained by some tBuFc þ or 1-methyl-3-(3-trimethoxysilylpropyl)imidazolium cations expelled into the aqueous solution. A similar dependence was already found for different electrodes modified with the hydrophobic RTIL -1-decyl-3-methylimidazolium bis(trifluoromethylsulfonyl)-imide [14,44,45]. It indicates a significant contribution of anion insertion into the ionic liquid precursor deposit (1).…”

Section: Voltammetry Of T-butylferrocene Immobilized On the Electrodesupporting

confidence: 67%

“…This is opposite to the behavior of the same redox probe dissolved in precursor. This is actually the second example of RTIL where anion-sensitive tBuFc electrochemistry is observed [14]. Comparison with earlier data indicates that 1-methyl-3-(3-trimethoxysilylpropyl)-imidazolium cation is less prone to be ejected to the aqueous solution than previously measured for 1-decyl-3-methylimidazolium cation [14].…”

Section: Discussionmentioning

confidence: 66%

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The Effect of Ionic Liquid Covalent Bonding to Sol‐Gel Processed Film on Ion Accumulation and Transfer

et al. 2009

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Accumulation of electroactive anions into a silicate film with covalently bonded room temperature ionic liquid film deposited on an indium tin oxide electrode was studied and compared with an electrode modified with an unconfined room temperature ionic liquid. A thin film containing imidazolium cationic groups was obtained by sol-gel processing of the ionic liquid precursor 1-methyl-3-(3-trimethoxysilylpropyl)imidazolium bis(trifluoromethylsulfonyl)imide together with tetramethylorthosilicate on the electrode surface. Profilometry shows that the obtained film is not smooth and its approximate thickness is above 1 mm. It is to some extent permeable for a neutral redox probe -1,1'-ferrocene dimethanol. However, it acts as a sponge for electroactive ions like Fe(CN) 6 3À , Fe(CN) 6 4À and IrCl 6 3À . This effect can be traced by cyclic voltammetry down to a concentration equal to 10 À7 mol dm À3 . Some accumulation of the redox active ions also occurs at the electrode modified with the ionic liquid precursor, but the voltammetric signal is significantly smaller compare with the bare electrode. The electrochemical oxidation of the redox liquid tbutyloferrocene deposited on silicate confined ionic liquid film is followed by the expulsion of the electrogenerated cation into an aqueous solution. On the other hand, the voltammetry obtained with the electrode modified with tbutyloferrocene solution in the ionic liquid precursor exhibits anion sensitive voltammetry. This is explained by anion insertion into the unconfined ionic liquid deposit following t-butylferricinium cation formation.

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Section: Voltammetry Of T-butylferrocene Immobilized On the Electrodesupporting

confidence: 67%

Section: Discussionmentioning

confidence: 66%

The Effect of Ionic Liquid Covalent Bonding to Sol‐Gel Processed Film on Ion Accumulation and Transfer

et al. 2009

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“…From an electroanalytical chemistry viewpoint, hydrophobic ILs are promising for modifying the electrode surface, [98][99][100][101][102][103][104][105][106] preparing membranes for ion-selective electrodes, [107][108][109][110][111] salt bridges, [112][113][114] and other potentiometric as well as voltammetric sensors. 115 A remarkable growth in the number of papers dealing with carbon paste and other carbon electrodes impregnated with ILs attests the strong interest to apply ILs for electroanalytical chemistry.…”

Section: Introductionmentioning

confidence: 99%

Mutual Solubility of Hydrophobic Ionic Liquids and Water in Liquid-Liquid Two-phase Systems for Analytical Chemistry

Kakiuchi

2008

ANAL. SCI.

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Liquid-liquid two-phase systems formed by a hydrophobic ionic liquid and water find several useful ways of application in analytical chemistry. One of the most important properties of such two-phase systems is the mutual solubility of the IL and water. Recent advancements on this subject have been reviewed. The solubility of ionic liquids in water is related to the standard Gibbs energies of the transfer of ions constituting the ionic liquid from the ionic liquid phase to water. Although this single ionic property cannot be measured thermodynamically and also varies from one ionic liquid to another, the standard Gibbs energy of the ion transfer from a polar aprotic solvent, such as nitrobenzene and 1,2-dichloroethane, to water is a convenient measure for it. The solubility of an ionic liquid in water and the electrochemical properties at the interface between the two phases are intimately related with each other.

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“…If, initially, ions are not present in the organic liquid, the reaction starts at a three phase junction, i.e., electrode j liquid j liquid formed at the circumference of the organic liquid. The electrode modification with a supported organic phase [7][8][9][10][11][12][13] or ionic liquid [14][15][16][17] removes this restriction, because the electron transfer reaction zone is not limited to the three phase junction. Moreover, it has been recognized that the addition of the electrolyte to the organic liquid deposit may change the mechanism of the overall electrode process, in particular ion transfer across the liquid j liquid interface [7,10,16,17].…”

Section: Introductionmentioning

confidence: 99%

Voltammetry of Mn(III) Porphyrin in Trihexyl(tetradecyl)‐phosphonium Tris(pentafluoroethyl)trifluorophosphate Supported Toluene in Contact with an Aqueous Electrolyte

et al. 2011

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Voltammetry of manganese tetraphenylporphyrinato chloride in trihexyl(tetradecyl)phosphonium tris(pentafluoroethyl)trifluorophosphate solution in toluene reveals its unexpectedly low diffusion coefficient. UV-vis spectra confirm significant Cl À exchange with large phosphate anion at the axial position of the complex. Experiments performed with a glassy carbon electrode covered by a liquid film of the same solution and immersed in an aqueous electrolyte solution show a peak potential dependence on the nature and concentration of the aqueous electrolyte anion described by a Nernst type equation. Electron transfer is followed by anion expulsion where the anion effect results from the lability of the axial coordination site of the porphyrin and from spontaneous ion exchange.

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Ion transfer processes at ionic liquid based redox active drop deposited on an electrode surface

Cited by 37 publications

References 27 publications

The Effect of Ionic Liquid Covalent Bonding to Sol‐Gel Processed Film on Ion Accumulation and Transfer

The Effect of Ionic Liquid Covalent Bonding to Sol‐Gel Processed Film on Ion Accumulation and Transfer

Mutual Solubility of Hydrophobic Ionic Liquids and Water in Liquid-Liquid Two-phase Systems for Analytical Chemistry

Voltammetry of Mn(III) Porphyrin in Trihexyl(tetradecyl)‐phosphonium Tris(pentafluoroethyl)trifluorophosphate Supported Toluene in Contact with an Aqueous Electrolyte

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