Ion transfer across the water-o-dichlorobenzene interface

Hundhammer, B.; Müller, Claudia; Solomon, Theodros; Alemu, Hailemichael; Hassen, Hamid

doi:10.1016/0022-0728(91)87072-c

Cited by 40 publications

(41 citation statements)

References 22 publications

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“…The anion was assumed to be either NO 3 Figure 3a) 20 -given in Figure 3b show that the peak potential is invariant with ∆ s F φ A 0′ until a given value (0.1 V) above which it increases linearly with (Figure 3a). This demonstrates how the counterion, here either PF 6 -or NO 3 -, determines whether a given cation can partition from the aqueous to the film phase.…”

Section: Resultsmentioning

confidence: 99%

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Ion Limited Charging of Nanoparticle Thin Films

Laaksonen¹,

Ruiz²,

Liljeroth³

et al. 2008

J. Phys. Chem. C

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This article reports on the charging behavior of thin films of alkanethiol protected gold nanoparticles, socalled monolayer protected clusters (MPCs), immersed in aqueous solution. We demonstrate that the oxidation of the MPCs is controlled by the transfer of counter-ions across the aqueous/MPC film interface. A model is developed to describe this and its predictions compared with experiment. Langmuir-Schaefer MPC thin films were transferred to a glassy carbon electrode and film charging behavior investigated in a series of aqueous solutions comprised of different base electrolyte anions. The dependence of peak current on film thickness and peak position on anion lipophilicity for MPC oxidative charging can all be accounted for with the ion-transfer limited model. The impact of ion partitioning into the film at equilibrium is also discussed and the effect of the aqueous phase cation is theoretically considered. In addition, the effect of co-transported water with hydrophilic ions transferring into the film on film charging is rationalized.

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Section: Resultsmentioning

confidence: 99%

“…For instance, for a given film used in a series of experiments, we noted that the CV response in the presence of a given aqueous electrolyte is dependent on which electrolyte it was in contact with last. The response for a fresh film in contact with NH 4 PF 6 differs significantly if the film has already been in contact with LiTPBF 20 .…”

Section: Resultsmentioning

confidence: 99%

Ion Limited Charging of Nanoparticle Thin Films

Laaksonen¹,

Ruiz²,

Liljeroth³

et al. 2008

J. Phys. Chem. C

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“…The ratio of the diffusion coefficients, Figure 3; these linear relationshipsa re similart ot hose described previously, [7,9,17,18] and the slopes of the correction lines are 1.3 for NB, 1.0 for DCE, and 1.1 for NPOE.T he standard Gibbs energy of solvation of the ioni nt he organic solvent, DG 0 S ,c onsistso faneutral term for cavity formation and an electricalterm. [44] It appears that the energy of cavity formation accountsf or most of DG 0 S and the electrical term is negligible in toluene.…”

Section: Voltammetry Of Ion Transfer At the Interface Between Two Immmentioning

confidence: 91%

Voltammetry of Ion Transfer at a Water–Toluene Micro‐ Interface

2016

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Voltammograms of ion transfer at the water (W) j toluenei nterface were recorded for the first time by using am icro-interface electrolytic cell and bis(triphenylphosphoranylidene)ammonium tetrakis [3,5-bis(trifluoromethyl)phenyl]borate (BTPPA + TFPB À ). The high solubility of BTPPA + TFPB À in toluene at room temperature enabled the electrochemical measurements. The potentialw indow at the W j toluene interface is about 1.09 V, which is 0.30 Vl arger than that at the W j 1,2-dichloroethane interface when using 10 mmol dm À3 NaCl as the supporting electrolyte in W. The transfer reactions of quaternary ammonium ions acrosst he W j toluene interface were found to be reversible.F ormal potentials for ion transfer from Wt ot oluene were evaluated, and linear correlations were observed between these formal potentials and the standard potentials reported at the W j nitrobenzene, W j 1,2-dichloroethane,a nd W j 2-nitrophenyl octyl ether interfaces.Voltammetry of ion transfer at the interface between two immiscible electrolyte solutions( VITIES)a llows investigation of ion-transfer reactions across aw ater (W) j organic solution ( O) interface. This allows the determination of the mechanism of distribution of an ion at the interface and the process generating the potential at an ion-selective electrode, and the understanding of electrochemical phenomena occurring in living organisms. [1][2][3][4][5] To date, primarily nitrobenzene (NB) and 1,2-dichloroethane (DCE) have been used as the Os olution for voltammetrics tudies of the W j Oi nterface, because of their low mutual solubility with water and ratherhighd ielectric constant (e, % 10-15), and thus are suitable for as upporting electrolyte (SE). Other Os pecies, such as 2-nitrophenyl octyl ether (NPOE), [6,7] 2,6-dimethylnitrobenzene, [8] o-dichlorobenzene, [9,10] 2-heptanone, [11] 2-octanone, [11,12] chloroform, [13] 1,6-dichlorohexane, [14] 1,4-dichlorobutane, [14] acetophenone, [15] n-octanol, [13,16] a,a,a-trifluorotoluene, [17] 5-nonanone, [12] room temperature ionic liquids (RTIL), [18][19][20] and mixed solvents, [10,21,22] are also useful for VITIES, but the low e ( % 2) of aromatich ydrocarbon solvents, in general,r esultsi nl ow solubility of the SE. The interface between Wa nd an aromatic hydrocarbon such as toluene is utilized in solvente xtraction, [23,24] and over the past several decades the formation of nanoparticles and thin-layer films at the W j toluene interface has been studied extensively. [25][26][27][28][29][30] To the best of our knowledge,h owever,t here are no direct experimental data on VITIES at the W j toluene interface.Use of am icro-electrode and tetrahexylammonium perchlorate (THexA + ClO 4 À )a st he SE enablet he observation of the reversible response for the redox reaction of ferrocene [31] or porphyrins [32,33] in toluene, because the micro-electrode reduces the effect of the ohmic drop. The effect of the addition of the RTIL [trihexyl(tetradecyl)phosphonium tris(pentafluoroethyl)-trifluorophosphate, aph4.cph12]t ot oluene has be...

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“…Other solvents such as 2-nitrophenyl octyl ether (NPOE), 2-heptanone [19,20], 2-octanone [20], 1,6-dichlorohexane [21,22], 1,4-dichlorobutane [22], acetophenone [23], dichlorobenzene [24], and even lately room temperature ionic liquids (RTIL) [25][26][27][28][29] have been found to be suitable, but are either expensive or difficult to prepare.…”

Section: Introductionmentioning

confidence: 99%