Voltammetry of Ion Transfer across the Electrochemically Polarized Micro Liquid-Liquid Interface between Water and a Room-temperature Ionic Liquid, Tetrahexylammonium Bis(trifluoromethylsulfonyl)imide, Using a Glass Capillary Micropipette

Tsujioka, Norihiro; Imakura, Seiichi; Nishi, Naoya; Kakiuchi, Takashi

doi:10.2116/analsci.22.667

Cited by 39 publications

(39 citation statements)

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“…The top and middle voltammograms in Figure The positive current reflects the transfer of tetraethylammonium ions from W inside the capillary to the IL phase. The steady-state appearance of the voltammograms reflects the tapered shape of the capillary; this shape enhances the radial diffusion inside the capillary (49). The inset in Figure 4b shows that at a sufficiently slow scan rate of 20 mV/s, the steady-state voltammogram allows one to infer the characteristic parameter of charge transfer, the half-wave potential E 1/2 .…”

Section: Voltammetry Of Ion Transfer Across the Il|w Interfacementioning

confidence: 95%

“…The inset in Figure 4b shows that at a sufficiently slow scan rate of 20 mV/s, the steady-state voltammogram allows one to infer the characteristic parameter of charge transfer, the half-wave potential E 1/2 . The correlation of  W NB  0 i with E 1/2 at the [C 18 Iq + ][TFPB − ]|W interface for a series of ions suggests that [C 18 Iq + ][TFPB − ] is more polar than DCE and is similar to NB (18,49).…”

Section: Voltammetry Of Ion Transfer Across the Il|w Interfacementioning

confidence: 99%

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Electrochemical Aspects of Ionic-Liquid|Water Two-Phase Systems

Kakiuchi¹

2007

Anal. Chem.

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See https://pubs.acs.org/sharingguidelines for options on how to legitimately share published articles.R oom-temperature ionic liquids (ILs) that are salts in the liquid state have attracted much attention in a variety of areas because of their unique features, such as extremely low volatility, high polarity, and reasonable electrical conductivity (1-11).An IL with sufficient hydrophobicity forms a two-phase system upon contact with an aqueous phase (W). Among IL applications, the use of IL |W two-phase systems is one of the most promising for extraction and electroanalytical chemistry. An IL can be used as a substitute for a conventional organic solvent because its properties are similar to (but somewhat different from) those of polar molecular solvents (12, 13). However, IL|W systems have one distinct feature-when the liquids are brought into contact, ions in the IL start to dissolve in W, and a potential difference develops across the interface between the two phases. The origin of this phase-boundary potential is the difference between the affinity that the anions in the IL have for W and the affinity that the cations in the IL have for W. This is where the fundamental difference between ILs and molecular solvents emerges (14, 15).The phase-boundary potential dramatically influences the partitioning of charged components between the IL and W phases. The electrical double layers formed at the IL|W interface should affect the surface properties of the systems used in chromatography, electrophoresis, and potentiometric ion sensing. For a better understanding of the properties of IL |W two-phase systems, an electrochemical viewpoint is useful and important. In this article, some examples illustrating the importance of the phase-boundary potential are presented together with basic electrochemical concepts required in dealing with IL|W two-phase systems. Partition equilibriaThe mutual solubility of the IL and W vary considerably, depending on the ions that make up the IL. Most ILs used for extraction studies have relatively high solubility in W, on the order of a few tens of millimolar (items 1-3 in Table 1 ; 16, 19). Strongly hydrophobic ILs (items 8-10) are 3 orders of magnitude less soluble in water; moderately soluble ones (items 4-6) are in between, at a few millimolar. Although octanol-water partition coefficients IonIc-LIquId | Water Two-Phase Systems takashi KakiuchiKyoto UniversityAn electrochemical perspective is crucial for understanding such two-phase systems.Tony Fernandez S e p t e m b e r 1 , 2 0 0 7 / A n A l y t i c A l c h e m i S t r y 6 4 4 3

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Section: Voltammetry Of Ion Transfer Across the Il|w Interfacementioning

confidence: 95%

Section: Voltammetry Of Ion Transfer Across the Il|w Interfacementioning

confidence: 99%

Electrochemical Aspects of Ionic-Liquid|Water Two-Phase Systems

Kakiuchi¹

2007

Anal. Chem.

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“…Electrochemical ion transfer studies performed with nitrophenylphenylether [47] and other chlorinated organic solvents [83], like 1,6-dichlorohexane and 1,4-dichlorobutane, can also be found in the literature. Recently, the ionic transfer across the liquid-liquid interface where ionic liquids are one of the phases has emerged as a very attractive field, mainly due to their extraordinary properties such as electrical self-conductance and catalytic features [84][85][86][87][88][89][90].…”

Section: Organic Solvents Used In Biomimetic Membranesmentioning

confidence: 99%

Voltammetric Insights in the Transfer of Ionizable Drugs Across Biomimetic Membranes - Recent Achievements

Gulaboski¹,

Borges²,

Pereira³

et al. 2007

CCHTS

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Abstract:The latest results of voltammetric research on the ionic transfer process of ionisable drugs across bare and lipid-modified liquid-liquid interfaces are reviewed. In recent years, two voltammetric methods have been extensively applied to this purpose, i.e. the classical four electrode voltammetry at the interface between two immiscible electrolyte solutions, and the "three-phase electrode." Thus, a brief background of the methodologies and some successful examples of their application are highlighted in this work. Particular attention is given to the ionic transfer kinetics and to the electrochemical characterization of the drug-membrane interactions between the ionized drugs and lipid-modified interfaces. Future trends in this area are also mentioned in connection with high-throughput assessment of ADMET properties of drugs.

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“…In particular, the group of Kakiuchi has been very active [6][7][8] since their pioneering work in 2003 [9], and the first review paper on this topic was published recently [10]. Ion transfer at the W|RTIL interface is a special case of ion transfer at the interface between two immiscible electrolyte solutions (ITIES), which enables the study and detection of ions not easily oxidisable or reducible at solid|liquid interfaces.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the W|RTIL studies so far have focussed on very hydrophobic salts that are solid at room temperature, with a few recent reports of RTILs that are liquid at 25 o C [8,12]. The work reported so far has been performed at single interfaces of milli- [9,12], micro- [7] or nano- [8] metre dimensions. RTILs have also been used in a solid-supported polyvinylidenefluoride membrane sandwiched between two aqueous phases [13].…”

Section: Introductionmentioning

confidence: 99%

Array of water|room temperature ionic liquid micro-interfaces

Silvester

Arrigan

2011

Electrochemistry Communications

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Cyclic Voltammetry and AC Voltammetry were used to characterise the micro-interface array between water and a commercially available room temperature ionic liquid (RTIL) trihexyltetradodecylphosphonium tris(pentafluoroethyl)trifluoromethylphosphate ([P 14,6,6,6 ][FAP]) for the first time. The interface array was formed within the micropores of a silicon chip membrane (30 pores, 23 µm diameter). The polarisable potential window and capacitance curves were recorded, and the transfers of three cations (tetraalkylammoniums) and three anions (tetraphenylborate, hexafluorophosphate and tetrafluoroborate) across the interface were studied. The shapes of the voltammograms revealed that the RTIL filled the pores and that the interface was located at/near the pore mouths. This is the first report of voltammetry at an array of water|RTIL microinterfaces, rather than at a single interface or porous polymer supported-interface. This work is particularly relevant to the sensing/extraction of redox-inactive ions. KeywordsRoom temperature ionic liquid, water/ionic liquid interface, ion transfer, voltammetry, microinterface.3

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Voltammetry of Ion Transfer across the Electrochemically Polarized Micro Liquid-Liquid Interface between Water and a Room-temperature Ionic Liquid, Tetrahexylammonium Bis(trifluoromethylsulfonyl)imide, Using a Glass Capillary Micropipette

Cited by 39 publications

References 51 publications

Electrochemical Aspects of Ionic-Liquid|Water Two-Phase Systems

Electrochemical Aspects of Ionic-Liquid|Water Two-Phase Systems

Voltammetric Insights in the Transfer of Ionizable Drugs Across Biomimetic Membranes - Recent Achievements

Array of water|room temperature ionic liquid micro-interfaces

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