Electrochemical Behavior of Iron-based Imidazolium Chloride Ionic Liquids

Nonaqueous System of Iron-Based Ionic Liquid and DMF for the Oxidation of Hydrogen Sulfide and Regeneration by Electrolysis

“…Compared with Fe(III/II)-IL, the redox peaks of the iron ions (2 and 2′) slightly shift to more negative potentials when DMF is added to the system, which may be caused by the interaction between Fe(III)/Fe(II) and DMF. 20 Notably, there are large oxidation waves at 1−2 V of Fe(III/II)-IL/DMF (Figure 2 peaks 4 and 5), which are due to the oxidation of the chlorine element on the platinum electrode: Cl − → Cl(a) + e − , 2Cl(a) ↔ Cl 2 , where Cl(a) is a chlorine adatom. 26 This result can be attributed to the solvation effect by polar and Lewis basic DMF on Fe−Cl in Fe(III/II)-IL, which may decrease the stability of the Fe−Cl bond and produce free chlorine easily in the electric field.…”

“…The conversion efficiency slightly reduces when the anode electrolytic voltage is higher than 0.8 V, which is attributed to the enhancing interference as FeCl 4 − migrates to the anode with increasing anode electrolytic voltage. 20 However, because of the small area of the platinum electrode (300 mm 2 ), the high viscosity of Fe(III/II)-IL (which can cause low diffusion of Fe(II) 17 ), and the small electrolytic time of only 2.5 h, all of the conversion efficiencies of Fe(II) at various anode voltages are less than 20%. Therefore, it is necessary to use cosolvents, particularly polar and low viscosity solvents, to decrease the viscosity and to increase the conductivity and the apparent diffusion coefficient of the active species in the system.…”

How a Transition‐Metal(II) Chloride Interacts with a Eutectic AlCl3‐Based Ionic Liquid: Insights into the Speciation of the Electrolyte and Electrodeposition of Magnetic Materials

“…The broad and downfield shifted peaks could be attributedt ot he cationic species of [AlCl 2 L x ] + ,[ AlCl 3 L],a nd/ or [Fe(AlCl 4 ) 3 ] À .A sm entioned above,n eutrals peciesm ight also form due to the reactiono fC l À with the cationic species, [AlCl 2 L x ] + .T he chemical shifts of the Al complexes depend not only on atoms of the coordination sphere but also on the local geometry of the species. [57] The electron octet in [AlCl 4 ] À causesashielding that results in an Al chemical shift upfield to d = 103.2 ppm. In the case of electron-donating groups,t he Al nucleusi sm ore deshielded and thus resultsi nadownfield shift.…”

“…A UV/Vis spectrophotometric study of Fe III –chloro complexes in hypersaline LiCl solutions showed absorption peaks at approximately 240, 310, and 360 nm . The electrochemical behavior of Fe(III) and Fe(II) ions in ionic liquids was reported . In the UV/Vis spectra, little difference was observed between Fe(III)–IL and Fe(III/II)–IL and both the electronic spectra (Fe(III)–IL and Fe(III/II)–IL) displayed absorption bands at 249 and 367 nm .…”

“…The electrochemical behavior of Fe(III) and Fe(II) ions in ionic liquids was reported . In the UV/Vis spectra, little difference was observed between Fe(III)–IL and Fe(III/II)–IL and both the electronic spectra (Fe(III)–IL and Fe(III/II)–IL) displayed absorption bands at 249 and 367 nm . In our spectra, we also observed absorption bands at these wavelengths for FeCl 2 /[Py 1,4 ][TfO] and (FeCl 2 +AlCl 3 )/[Py 1,4 ][TfO].…”