Water content and related physical properties of aliphatic quaternary ammonium imide-type ionic liquid containing metal ions

Katase, Takuma; Imashuku, Susumu; Murase, Kuniaki; Hirato, Tetsuji; Awakura, Yasuhiro

doi:10.1016/j.stam.2006.02.017

Cited by 17 publications

(16 citation statements)

References 18 publications

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“…In the absence of nitrate, the spectrum at R NO 3 – = 0 exhibits 3 maxima at 430, 691, and 815 nm. This spectrum is in agreement with the one obtained by Katase et al for Ni(II) solution in the dry [trimethyl- n -hexylammonium][Tf 2 N] IL . Addition of nitrate ions in Ni(Tf 2 N) 2 -[C 4 mim][Tf 2 N] solutions leads to both an increase of the peak intensity and to a band shift.…”

Section: Resultssupporting

confidence: 91%

Nickel(II) Complexation with Nitrate in Dry [C₄mim][Tf₂N] Ionic Liquid: A Spectroscopic, Microcalorimetric, and Molecular Dynamics Study

et al. 2016

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The complex formation of nitrate ions with nickel(II) in dry [C4mim][Tf2N] ionic liquid (IL) was investigated by means of UV-visible spectrophotometry, isothermal titration calorimetry (ITC), extended X-ray absorption fine structure spectroscopy (EXAFS), and molecular dynamics (MD) simulations. EXAFS spectroscopy and MD simulations show that the solvated Ni(II) cation is initially coordinated by the oxygens of the [Tf2N](-) anion of IL, which can behave either as mono- or bidentate. Spectroscopic and thermodynamic data show that Ni(II) is able to form up to three stable mononuclear complexes with nitrate in this solvent. The stability constants for Ni(NO3)j complexes (j = 1-3) calculated from spectrophotometry and ITC experiments decrease in the order log K1 > log K2 > log K3. The formation of the first two species is enthalpy-driven, while the third species is entropy-stabilized. The UV-vis spectra of solutions containing different nitrate/Ni(II) ratios show that the metal ion retains the six-coordinate geometry. Furthermore, the EXAFS evidences that nitrate is always bidentate. Molecular dynamics simulations show that the [Tf2N](-) anions bind Ni(II) through the sulfonyl oxygen atoms and can coordinate either as monodentate or chelate. The analysis of the MD data shows that introduction of nitrates in the first coordination sphere of the metal ion results in remarkable structural rearrangement of the ionic liquid.

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Section: Resultssupporting

confidence: 91%

Nickel(II) Complexation with Nitrate in Dry [C₄mim][Tf₂N] Ionic Liquid: A Spectroscopic, Microcalorimetric, and Molecular Dynamics Study

et al. 2016

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“…However, water exists ubiquitously in ILs irrespective to their tendency to hydration. Even hydrophobic ILs, such as trimethyl-n-hexylammonium bis((trifluoromethyl)sulfonyl)amide (TMHA-Tf 2 N) and 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM-PF 6 ), were found to slightly host residual water even when special measures for dehydration have been taken 9 10 . In terms of ILs with high hydrophilicity, especially imidazolium and pyrrolidinium based ILs containing numerous halogen anions, they readily absorb moisture from the ambient environment.…”

mentioning

confidence: 99%

Effect of water presence on choline chloride-2urea ionic liquid and coating platings from the hydrated ionic liquid

Zhao

Chen

et al. 2016

Sci Rep

150

166

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In the present study, hygroscopicity of the choline chloride-urea (ChCl-2Urea) ionic liquid (IL) was confirmed through Karl-Fisher titration examination, indicating that the water content in the hydrated ChCl-2Urea IL was exposure-time dependent and could be tailored by simple heating treatment. The impact of the absorbed water on the properties of ChCl-2Urea IL, including viscosity, electrical conductivity, electrochemical window and chemical structure was investigated. The results show that water was able to dramatically reduce the viscosity and improve the conductivity, however, a broad electrochemical window could be persisted when the water content was below ~6 wt.%. These characteristics were beneficial for producing dense and compact coatings. Nickel (Ni) coatings plating from hydrated ChCl-2Urea IL, which was selected as an example to show the effect of water on the electroplating, displayed that a compact and corrosion-resistant Ni coating was plated from ChCl-2Urea IL containing 6 wt.% water doped with 400 mg/L NA at a moderate temperature. As verified by FTIR analysis, the intrinsic reason could be ascribed that water was likely linked with urea through strong hydrogen bond so that the water decomposition was suppressed during plating. Present study may provide a reference to prepare some similar water-stable ILs for plating.

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“…Ni[Tf 2 N] 2 was synthesized according to reported procedures in the previous literature. , Bis(trifluoromethanesulfonyl)imide (Morita Chemical Industry Co., Ltd., 1.65 g) was dissolved in 36 mL of pure water, and then the solution was treated with N 2 bubbling for 30 min. Ni(OH) 2 (Waco Pure Chemical Industry Co., Ltd., 10.1 g) was added to the aqueous solution, and the solution was agitated at 343 K for 2 h. The solution was then cooled at ambient temperature.…”

Section: Experimental Methodsmentioning

confidence: 99%

One-Pot Synthesis of PtNi Alloy Nanoparticle-Supported Multiwalled Carbon Nanotubes in an Ionic Liquid Using a Staircase Heating Process

Izumi

Tsuda

et al. 2020

ACS Omega

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High-performance PtNi alloy nanoparticle-supported multiwalled carbon nanotube composite (PtNi/MWCNT) electrocatalysts can be prepared via one-pot preparation for oxygen reduction reaction. This route of preparation utilizes the pyrolytic decomposition of metal precursors, such as Pt(acac) 2 with Ni precursors, nickel bis(trifluoromethanesulfonyl)amide (Ni[Tf 2 N] 2 ) or nickel acetylacetonate (Ni(acac) 2 ), in an ionic liquid (IL), N , N , N -trimethyl- N -propylammonium bis(trifluoromethanesulfonyl)amide ([N 1,1,1,3 ][Tf 2 N]). Currently, there is insufficient information concerning the effect of difference in preparation conditions on the formation mechanism and catalytic activity of PtNi/MWCNT. In this article, a staircase heating process was used to investigate the PtNi alloy nanoparticle formation mechanism and catalytic activity of the resulting PtNi/MWCNT. We found that the alloy formation process, composition, and crystal structure, which directly affect the electrocatalytic activity, strongly depended on the Ni precursor species and heating process. The catalytic performance of certain PtNi/MWCNTs collected during the staircase heating process was better than that of PtNi/MWCNTs produced via the conventional heating process.

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Water content and related physical properties of aliphatic quaternary ammonium imide-type ionic liquid containing metal ions

Cited by 17 publications

References 18 publications

Nickel(II) Complexation with Nitrate in Dry [C₄mim][Tf₂N] Ionic Liquid: A Spectroscopic, Microcalorimetric, and Molecular Dynamics Study

Nickel(II) Complexation with Nitrate in Dry [C₄mim][Tf₂N] Ionic Liquid: A Spectroscopic, Microcalorimetric, and Molecular Dynamics Study

Effect of water presence on choline chloride-2urea ionic liquid and coating platings from the hydrated ionic liquid

One-Pot Synthesis of PtNi Alloy Nanoparticle-Supported Multiwalled Carbon Nanotubes in an Ionic Liquid Using a Staircase Heating Process

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Water content and related physical properties of aliphatic quaternary ammonium imide-type ionic liquid containing metal ions

Cited by 17 publications

References 18 publications

Nickel(II) Complexation with Nitrate in Dry [C4mim][Tf2N] Ionic Liquid: A Spectroscopic, Microcalorimetric, and Molecular Dynamics Study

Nickel(II) Complexation with Nitrate in Dry [C4mim][Tf2N] Ionic Liquid: A Spectroscopic, Microcalorimetric, and Molecular Dynamics Study

Effect of water presence on choline chloride-2urea ionic liquid and coating platings from the hydrated ionic liquid

One-Pot Synthesis of PtNi Alloy Nanoparticle-Supported Multiwalled Carbon Nanotubes in an Ionic Liquid Using a Staircase Heating Process

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Product

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Nickel(II) Complexation with Nitrate in Dry [C₄mim][Tf₂N] Ionic Liquid: A Spectroscopic, Microcalorimetric, and Molecular Dynamics Study

Nickel(II) Complexation with Nitrate in Dry [C₄mim][Tf₂N] Ionic Liquid: A Spectroscopic, Microcalorimetric, and Molecular Dynamics Study