The influence of the cation structure on the basicity-related polarity of ionic liquids

2021 ◽  
Author(s):  
Nadine Weiß ◽  
Gabi Thielemann ◽  
Kevin Nagel ◽  
Caroline Hedwig Schmidt ◽  
Andreas Seifert ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Absorption Data ◽  
Anion Coordination

UV/Vis absorption data of (E)-4-(2-[5-{4,4,5,5-tetramethyl-1,3,2-dioxa-borolane-2-yl}thiene-2-yl]vinyl)-2-(di¬cyano-methylene)-3-cyano-5,5-dimethyl-2,5-dihydrofuran (ThTCF) as solvatochromic probe is applied to examine the anion coordination strength (e.g. of N(CN)2, BF4, PF6, N(Tf)2, CF3COO) as a function of cation structure...

scholarly journals CO2Capture in Ionic Liquids: A Review of Solubilities and Experimental Methods

2013 ◽  
Vol 2013 ◽  
pp. 1-16 ◽  
Author(s):  
Elena Torralba-Calleja ◽  
James Skinner ◽  
David Gutiérrez-Tauste
Keyword(s):  
Climate Change ◽  
Ionic Liquids ◽  
Carbon Dioxide Emissions ◽  
Large Scale ◽  
Fossil Fuel ◽  
Experimental Methods ◽  
Research Field ◽  
Experimental Techniques ◽  
Gravimetric Analysis ◽  
Absorption Data

The growing concern of climate change and global warming has in turn given rise to a thriving research field dedicated to finding solutions. One particular area which has received considerable attention is the lowering of carbon dioxide emissions from large-scale sources, that is, fossil fuel power. This paper focuses on ionic liquids being used as novel media for CO2capture. In particular, solubility data and experimental techniques are used at a laboratory scale. Cited CO2absorption data for imidazolium-, pyrrolidinium-, pyridinium-, quaternary-ammonium-, and tetra-alkyl-phosphonium-based ionic liquids is reviewed, expressed as mole fractions (X) of CO2to ionic liquid. The following experimental techniques are featured: gravimetric analysis, the pressure drop method, and the view-cell method.

Post-Synthetic Modification of Ionic Liquids Using Ligand-Exchange and Redox Coordination Chemistry

2020 ◽  
Author(s):  
Michael LeRoy ◽  
Austin Mroz ◽  
Jenna L. Mancuso ◽  
Aaron Miller ◽  
Allison Van Cleve ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Coordination Chemistry ◽  
Ligand Exchange ◽  
Covalent Bonding ◽  
Anion Coordination ◽  
Rheological Measurements ◽  
Vis Spectroscopy ◽  
Wide Range ◽  
Coordination Spheres

Ionic liquids (ILs) derive their useful properties from molecularly tunable compositions, but methods to diversify anion identities and probe ion speciation remain limited. Here, we demonstrate post-synthetic modification of perhalometallate anions to achieve ionic liquid-to-ionic liquid transformations. Rheological measurements of the metal-containing ILs indicate that minor alterations to anion coordination spheres induces considerable changes to IL viscosities. UV-vis spectra confirm the purities for most ILs, while revealing a surprising cation dependence of perchlorovanadate speciation and supramolecular structure. The intermolecular interactions studied here span a wide range from dispersion to covalent bonding, permitting their impact on IL viscosity to be decoupled and quantified. Together, synthetic strategies from coordination chemistry paired with conventional UV-vis spectroscopy provide a powerful tool for expanding IL compositions and investigating fundamental nanoscale behavior.

Post-Synthetic Modification of Ionic Liquids Using Ligand-Exchange and Redox Coordination Chemistry

2020 ◽  
Author(s):  
Michael LeRoy ◽  
Austin Mroz ◽  
Jenna L. Mancuso ◽  
Aaron Miller ◽  
Allison Van Cleve ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Coordination Chemistry ◽  
Ligand Exchange ◽  
Covalent Bonding ◽  
Anion Coordination ◽  
Rheological Measurements ◽  
Vis Spectroscopy ◽  
Wide Range ◽  
Coordination Spheres

Ionic liquids (ILs) derive their useful properties from molecularly tunable compositions, but methods to diversify anion identities and probe ion speciation remain limited. Here, we demonstrate post-synthetic modification of perhalometallate anions to achieve ionic liquid-to-ionic liquid transformations. Rheological measurements of the metal-containing ILs indicate that minor alterations to anion coordination spheres induces considerable changes to IL viscosities. UV-vis spectra confirm the purities for most ILs, while revealing a surprising cation dependence of perchlorovanadate speciation and supramolecular structure. The intermolecular interactions studied here span a wide range from dispersion to covalent bonding, permitting their impact on IL viscosity to be decoupled and quantified. Together, synthetic strategies from coordination chemistry paired with conventional UV-vis spectroscopy provide a powerful tool for expanding IL compositions and investigating fundamental nanoscale behavior.

SIGMAL: A Program for Calculating L-Shell lonization Cross-Sections

1981 ◽  
Vol 39 ◽  
pp. 198-199 ◽  
Author(s):  
R.F. Egerton
Keyword(s):  
Cross Sections ◽  
Fortran Program ◽  
Absorption Data ◽  
X Ray ◽  
Atomic Electrons ◽  
Energy Dependent ◽  
Hydrogenic Model ◽  
Electron Energy Loss ◽  
X Ray Absorption ◽  
Shell Ionization

SIGMAL is a short (∼ 100-line) Fortran program designed to rapidly compute cross-sections for L-shell ionization, particularly the partial crosssections required in quantitative electron energy-loss microanalysis. The program is based on a hydrogenic model, the L1 and L23 subshells being represented by scaled Coulombic wave functions, which allows the generalized oscillator strength (GOS) to be expressed analytically. In this basic form, the model predicts too large a cross-section at energies near to the ionization edge (see Fig. 1), due mainly to the fact that the screening effect of the atomic electrons is assumed constant over the L-shell region. This can be remedied by applying an energy-dependent correction to the GOS or to the effective nuclear charge, resulting in much closer agreement with experimental X-ray absorption data and with more sophisticated calculations (see Fig. 1 ).

Investigation of Various Ionic Liquids and Catalyst Materials for Lithium-Oxygen Batteries

2011 ◽  
pp. 110923034559006
Author(s):  
Arnd Garsuch ◽  
D. Michael Badine ◽  
Klaus Leitner ◽  
Luiz H. S. Gasparotto ◽  
Natalia Borisenko ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Lithium Oxygen Batteries
Sign in / Sign up

Export Citation Format

Share Document