An ultrafast vibrational study of dynamical heterogeneity in the protic ionic liquid ethyl-ammonium nitrate. I. Room temperature dynamics

2021 ◽  
Vol 154 (13) ◽  
pp. 134502
Author(s):  
Clinton A. Johnson ◽  
Anthony W. Parker ◽  
Paul M. Donaldson ◽  
Sean Garrett-Roe
Keyword(s):  
Ionic Liquid ◽  
Ammonium Nitrate ◽  
Room Temperature ◽  
Protic Ionic Liquid ◽  
Dynamical Heterogeneity ◽  
Vibrational Study ◽  
Temperature Dynamics

scholarly journals An Ultrafast Vibrational Study of Dynamical Heterogeneity in the Protic Ionic Liquid Ethyl-Ammonium Nitrate

2019 ◽  
Author(s):  
Clinton Johnson ◽  
Anthony W. Parker ◽  
Paul M. Donaldson ◽  
Sean Garrett-Roe
Keyword(s):  
Hydrogen Bond ◽  
Ammonium Nitrate ◽  
Spectral Diffusion ◽  
Relaxation Rates ◽  
Protic Ionic Liquid ◽  
Dynamical Heterogeneity ◽  
Polarization Control ◽  
2D Ir ◽  
Jump Model ◽  
Rotational Components

<p>Using ultrafast two-dimensional infrared spectroscopy (2D-IR), a vibrational probe (thiocyanate, SCN<sup>-</sup>) was used to investigate the hydrogen bonding network of a molten salt (ethyl-ammonium nitrate, EAN) compared to that of H2O. The 2D-IR experiments were performed in both parallel () and perpendicular () conditions along with temperature dependence for both EAN (14-130 ˚C) and H2O (5-89 ˚C). With polarization control, the frequency fluctuation correlation function can be separated into structural and rotational components. An Arrhenius analysis lead to independent activation energies for the isotropic, and anisotropic signals, structural spectral diffusion, and rotational induced spectral diffusion. The rotational E<sub>a</sub>s were similar for both EAN and H2O suggesting that SCN<sup>-</sup> is experiencing a similar jump model, i.e. where hydrogen bond reorientation is dominated by large angular jumps stemming from molecular rotation dynamics. The frequency pre-factors, however, were different where the more rigid and vicious EAN had a slower rate. Furthermore, the 2D-IR anisotropy and vibrational relaxation rates of EAN are frequency dependent, revealing that SCN<sup>-</sup> experiences two subensembles. We suggest that the sub-ensemble with a faster rotational timescale correlates to SCN<sup>-</sup> with more, weaker hydrogen bonds, and the sub-ensemble with a slower rotational timescale correlates to SCN<sup>-</sup> with a stronger, more directional hydrogen bond.</p>

A Protic Ionic Liquid Catalyzes CO2Conversion at Atmospheric Pressure and Room Temperature: Synthesis of Quinazoline-2,4(1H,3H)-diones

2014 ◽  
Vol 126 (23) ◽  
pp. 6032-6035 ◽  
Author(s):  
Yanfei Zhao ◽  
Bo Yu ◽  
Zhenzhen Yang ◽  
Hongye Zhang ◽  
Leiduan Hao ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Atmospheric Pressure ◽  
Room Temperature ◽  
Temperature Synthesis ◽  
Protic Ionic Liquid ◽  
Room Temperature Synthesis

scholarly journals An Ultrafast Vibrational Study of Dynamical Heterogeneity in the Protic Ionic Liquid Ethyl-Ammonium Nitrate

2019 ◽  
Author(s):  
Clinton Johnson ◽  
Anthony W. Parker ◽  
Paul M. Donaldson ◽  
Sean Garrett-Roe
Keyword(s):  
Hydrogen Bond ◽  
Ammonium Nitrate ◽  
Spectral Diffusion ◽  
Relaxation Rates ◽  
Protic Ionic Liquid ◽  
Dynamical Heterogeneity ◽  
Polarization Control ◽  
2D Ir ◽  
Jump Model ◽  
Rotational Components

<p>Using ultrafast two-dimensional infrared spectroscopy (2D-IR), a vibrational probe (thiocyanate, SCN<sup>-</sup>) was used to investigate the hydrogen bonding network of a molten salt (ethyl-ammonium nitrate, EAN) compared to that of H2O. The 2D-IR experiments were performed in both parallel () and perpendicular () conditions along with temperature dependence for both EAN (14-130 ˚C) and H2O (5-89 ˚C). With polarization control, the frequency fluctuation correlation function can be separated into structural and rotational components. An Arrhenius analysis lead to independent activation energies for the isotropic, and anisotropic signals, structural spectral diffusion, and rotational induced spectral diffusion. The rotational E<sub>a</sub>s were similar for both EAN and H2O suggesting that SCN<sup>-</sup> is experiencing a similar jump model, i.e. where hydrogen bond reorientation is dominated by large angular jumps stemming from molecular rotation dynamics. The frequency pre-factors, however, were different where the more rigid and vicious EAN had a slower rate. Furthermore, the 2D-IR anisotropy and vibrational relaxation rates of EAN are frequency dependent, revealing that SCN<sup>-</sup> experiences two subensembles. We suggest that the sub-ensemble with a faster rotational timescale correlates to SCN<sup>-</sup> with more, weaker hydrogen bonds, and the sub-ensemble with a slower rotational timescale correlates to SCN<sup>-</sup> with a stronger, more directional hydrogen bond.</p>

Silver electrodeposition at room temperature protic ionic liquid 1-H-methylimidazolium hydrogen sulfate

2020 ◽  
Vol 313 ◽  
pp. 113487
Author(s):  
Natalia G. Sousa ◽  
João F.S. Salgueira ◽  
Camila P. Sousa ◽  
Othon S. Campos ◽  
Giancarlo R. Salazar-Banda ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Hydrogen Sulfate ◽  
Protic Ionic Liquid ◽  
Silver Electrodeposition

Preparation and Characterization of a Novel Room Temperature Dicationic Ionic Liquid and its Application in the Synthesis of Xanthenediones Under Solvent-Free Conditions

2018 ◽  
Vol 21 (8) ◽  
pp. 602-608 ◽  
Author(s):  
Zainab Ehsani-Nasab ◽  
Ali Ezabadi
Keyword(s):  
Ionic Liquid ◽  
Room Temperature ◽  
Reaction Times ◽  
Significant Loss ◽  
Solvent Free ◽  
Acidity Function ◽  
Efficient Catalyst ◽  
Solvent Free Conditions ◽  
Hammett Acidity Function ◽  
Dicationic Ionic Liquid

Aim and Objective: In the present work, 1, 1’-sulfinyldiethylammonium bis (hydrogen sulfate) as a novel room temperature dicationic ionic liquid was synthesized and used as a catalyst for xanthenediones synthesis. Material and Method: The dicationic ionic liquid has been synthesized using ethylamine and thionyl chloride as precursors. Then, by the reaction of [(EtNH2)2SO]Cl2 with H2SO4, [(EtNH2)2SO][HSO4]2 was prepared and after that, it was characterized by FT-IR, 1H NMR, 13C NMR as well as Hammett acidity function. This dicationic ionic liquid was used as a catalyst for the synthesis of xanthenediones via condensation of structurally diverse aldehydes and dimedone under solvent-free conditions. The progress of the reaction was monitored by thin layer chromatography (ethyl acetate/n-hexane = 3/7). Results: An efficient solvent-free method for the synthesis of xanthenediones has been developed in the presence of [(EtNH2)2SO][HSO4]2 as a powerful catalyst with high to excellent yields, and short reaction times. Additionally, recycling studies have demonstrated that the dicationic ionic liquid can be readily recovered and reused at least four times without significant loss of its catalytic activity. Conclusion: This new dicationic ionic liquid can act as a highly efficient catalyst for xanthenediones synthesis under solvent-free conditions.

Absorption Behavior of Acid Gases in Protic Ionic Liquid/Alkanolamine Binary Mixtures

2017 ◽  
Vol 5 (4) ◽  
pp. 3429-3437 ◽  
Author(s):  
Alsu I. Akhmetshina ◽  
Anton N. Petukhov ◽  
Andrey V. Vorotyntsev ◽  
Alexander V. Nyuchev ◽  
Ilya V. Vorotyntsev
Keyword(s):  
Ionic Liquid ◽  
Binary Mixtures ◽  
Acid Gases ◽  
Protic Ionic Liquid
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