pH and electrical conductivity measurements of aqueous solutions of amino acid-based ionic

Ionic liquids are promising materials for several applications. Amino acid based ionic liquids (AAILs) as a sort of a new generation of ionic liquids are recently proposed taking advantage of hydrogen bonding group and low toxicity. Three types of AAILs are examined in this work; namely 1-Octyl-3-Methylimidazolium Glycine [OMIM][Gly], 1-Octyl-3-Methylimidazolium Alanine [OMIM][Ala] and 1-Octyl-3-Methylimidazolium Proline [OMIM][Pro]. The pH and molar conductivity are measured at ambient conditions for AAILs aqueous solutions at different concentrations; specifically 1, 10, 20, and 30 wt.%. The experimental results show that all AAILs solutions are alkaline (pH>7) where [OMIM][Pro] has the highest pH compared to its counterparts. The trend is reversed for molar conductivity as [OMIM][Gly] showed the highest molar conductivity. These results are attributed to the smaller size of [Gly] compared to [Pro] and [Ala]. However, adding AAILs increases the molar conductivity of the water.

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Cholinium amino acid-based ionic liquids

Biophysical Reviews ◽

10.1007/s12551-021-00782-0 ◽

2021 ◽

Author(s):

Andrea Le Donne ◽

Enrico Bodo

Keyword(s):

Ionic Liquids ◽

Amino Acid ◽

Computational Chemistry ◽

Special Class ◽

State Of The Art ◽

Short Review ◽

Research Activity ◽

Intensive Research ◽

Low Toxicity ◽

Molecular Components

AbstractBoosted by the simplicity of their synthesis and low toxicity, cholinium and amino acid-based ionic liquids have attracted the attention of researchers in many different fields ranging from computational chemistry to electrochemistry and medicine. Among the uncountable IL variations, these substances occupy a space on their own due to their exceptional biocompatibility that stems from being entirely made by metabolic molecular components. These substances have undergone a rather intensive research activity because of the possibility of using them as greener replacements for traditional ionic liquids. We present here a short review in the attempt to provide a compendium of the state-of-the-art scientific research about this special class of ionic liquids based on the combination of amino acid anions and cholinium cations.

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Correction to “Thermodynamic Studies of Ionic Hydration and Interactions for Amino Acid Ionic Liquids in Aqueous Solutions at 298.15 K”

The Journal of Physical Chemistry B ◽

10.1021/jp407212s ◽

2013 ◽

Vol 117 (32) ◽

pp. 9584-9584 ◽

Cited By ~ 3

Author(s):

Dilip H. Dagade ◽

Kavita R. Madkar ◽

Sandeep P. Shinde ◽

Seema S. Barge

Keyword(s):

Ionic Liquids ◽

Amino Acid ◽

Aqueous Solutions ◽

Thermodynamic Studies ◽

Ionic Hydration

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Production and Study of Ca/Sn(II) Metastable Fluoride Ion Conductors

MRS Proceedings ◽

10.1557/proc-481-273 ◽

1997 ◽

Vol 481 ◽

Author(s):

Michael F. Bell ◽

Georges Dénès ◽

Zhimeng Zhu

Keyword(s):

Solid Solution ◽

Electrical Conductivity ◽

High Temperature ◽

Calcium Nitrate ◽

Fluoride Ion ◽

Conductivity Measurements ◽

Ambient Conditions ◽

Reaction Conditions ◽

Density Measurements ◽

Ion Conductors

ABSTRACTPrecipitation reactions from aqueous solutions of calcium nitrate and tin(II) fluoride result in the formation of two metastable phases, depending on the reaction conditions. Crystalline CaSn2F6 and the microcrystalline Ca1-xSnxF2 solid solution are obtained, the latter crystallizing in the cubic fluorite (CaF2) type with total Ca/Sn disorder. Both phases are fluoride ion conductors. Electrical conductivity measurements versus temperature and bulk density measurements show that both phases are far from thermodynamic equilibrium at ambient conditions, and thus are metastable. Both decompose to a mixture of SnF2 and CaF2 at high temperature. In addition, CaSn2F6 is chemically unstable in an aqueous medium, in which it looses SnF2 to give the microcrystalline Ca1-xSnxF2 solid solution.

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