Acid–Base Property of Ethylammonium Nitrate Ionic Liquid Directly Obtained Using Ion-selective Field Effect Transistor Electrode

Kanzaki, Ryo; Uchida, Kuniaki; Hara, Shota; Umebayashi, Yasuhiro; Ishiguro, Shin; Nomura, Satoshi

doi:10.1246/cl.2007.684

Cited by 64 publications

(79 citation statements)

References 19 publications

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“…[11][12][13] On the other hand, MacFarlane et al have shown that the proton transfer of HB + to A -proceeds in the pyrrolidinium based ionic liquids (smaller pKs), though the ΔpKa value is 5.7, which means significant amount of neutral species [B] and [HA] ] ionic liquid by a direct potentiometry with the IS-FET (ion selective field effective transistor) and Pt(H2) electrodes. 15,16 Actually, the pKs values of 10.004 with the IS-FET electrode and 9.83 with Pt(H2) one, respectively, are significantly different from the ΔpKa value of 11.93. It is thus important to determine pKs values of ionic liquids directly.…”

Section: Introductionmentioning

confidence: 91%

Physicochemical and Acid-base Properties of a Series of 2-Hydroxyethylammonium-based Protic Ionic Liquids

et al. 2012

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Section: Introductionmentioning

confidence: 91%

Physicochemical and Acid-base Properties of a Series of 2-Hydroxyethylammonium-based Protic Ionic Liquids

et al. 2012

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“…The latter are just beginning. 24,25 An example of the energy level diagram is provided in Figure 7. 21 It is constructed, following Gurney, by grouping acid and conjugate base forms of each molecule or ion together at a free energy level (in electronvolts) based on the arbitrary assignment of 0 eV to the couple H 3 O + /H 2 O.…”

Section: Protic Ionic Liquids: Properties and Applicationsmentioning

confidence: 99%

Parallel Developments in Aprotic and Protic Ionic Liquids: Physical Chemistry and Applications

2007

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This Account covers research dating from the early 1960s in the field of low-melting molten salts and hydrates,which has recently become popular under the rubric of "ionic liquids". It covers understanding gained in the principal author's laboratories (initially in Australia, but mostly in the U.S.A.) from spectroscopic, dynamic, and thermodynamic studies and includes recent applications of this understanding in the fields of energy conversion and biopreservation. Both protic and aprotic varieties of ionic liquids are included, but recent studies have focused on the protic class because of the special applications made possible by the highly variable proton activities available in these liquids.In this Account, we take a broad view of ionic liquids (using the term in its current sense of liquids comprised of ions and melting below 100°C). We include, along with the general cases of organic cation systems, liquids in which common inorganic cations (like Mg 2+ and Ca 2+ ) strongly bind a hydration or solvation shell and then behave like large cation systems and melt below 100°C.We will try to organize a wide variety of measurements on low-melting ionic liquid systems into a coherent body of knowledge that is relevant to the ionic liquid field as it is currently developing.Under the expanded concept of the field, ionic liquid studies commenced in the Angell laboratory in 1962 with a study of the transport properties of the hydrates of Mg(NO 3 ) 2 and Ca(NO 3 ) 2 . These were described as melts of "large weak-field cations" 1 and their properties correlated with those of normal anhydrous molten salts via their effective cation radii, the sum of the normal radius plus one water molecule diameter. This notion was followed in 1966 with a full study under the title "A new class of molten salt mixtures" in which the hydrated cations were treated as independent cation species. The large cations mixed ideally with ordinary inorganic cations such as Na + and K + , to give solutions in which such cohesion indicators as the glass transition temperature, T g , changed linearly with composition. The concept proved quite fruitful, and a field ("hydrate melts" or "solvate melts") developed in its wake in which asymmetric anions like SCN -and NO 2 -were used with solvated cations to create a very wide range of systems that were liquid at room temperature, while remaining ionic in their general properties.The validity of the molten salt analogy was given additional conviction by the observation that transition metal ions such as Ni(II) and Co(II) could be found in the complex anion states NiCl 4 2-and CoCl 4 2-when added to the "hydrate melt" chlorides. 2 Of special interest here was the observation 3 of extreme downfield NMR proton chemical shifts of hydrate protons when the hydrated cation was Al 3+ . These lay much further downfield than did the protons in strong mineral acids at the same concentration, leading to the design of solutions of highly acidic character from salts that would usually be considered neutral. Inde...

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“…The KS value of EAN can be determined, if the concentration of HNO3 in EAN is directly evaluated. This is indeed enabled by potentiometry using an IS-FET electrode, which showed a satisfactory Nernstian response against the pH (= -log[HNO3]), 19 although its detailed mechanism of response is still unknown. The IS-FET electrode also shows a quick and ideal response in other protic ionic liquids.…”

Section: Measurementsmentioning

confidence: 99%

Acidity and Basicity of Aqueous Mixtures of a Protic Ionic Liquid, Ethylammonium Nitrate

et al. 2008

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Acid–Base Property of Ethylammonium Nitrate Ionic Liquid Directly Obtained Using Ion-selective Field Effect Transistor Electrode

Cited by 64 publications

References 19 publications

Physicochemical and Acid-base Properties of a Series of 2-Hydroxyethylammonium-based Protic Ionic Liquids

Physicochemical and Acid-base Properties of a Series of 2-Hydroxyethylammonium-based Protic Ionic Liquids

Parallel Developments in Aprotic and Protic Ionic Liquids: Physical Chemistry and Applications

Acidity and Basicity of Aqueous Mixtures of a Protic Ionic Liquid, Ethylammonium Nitrate

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