Redox Reaction of Tris(acetylacetonato)iron(III) Complex in an Amide-type Ionic Liquid

Abstract

The redox reaction of tris(acetylacetonato)iron(III) (Fe(acac) 3 ) on a glassy carbon electrode was investigated in 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)amide (BMPTFSA). A one-electron transfer redox reaction of [Fe(acac) 3 ] 0/− showed the relatively negative potential of −1.4 V vs. Ag|Ag(I). The diffusion coefficient of Fe(acac) 3 estimated by chronoamperometry was (1.4 + 0.1) × 10 −7 cm 2 s −1 . The redox properties examined in this study suggested that the redox reaction of [Fe(acac) 3 ] 0/− can be utilized in the negative half-cell reaction of redox flow batteries.

Solubility model of metal complex in ionic liquids from first principle calculations

“…On the cation side, the imidazolium and pyrrolidinium cation are found as suitable ionic liquids to increase the solubility of metal complex in redox ow cell. Our theoretical predictions are in good agreement with the experimental work already reported in the work of Katayama et al 13,[15][16][17][18] and Ejigu et al 54 According to their studies, it is already known that the ionic liquid containing imidazolium ring and [NTf 2 ] À anion is the suitable non-aqueous solvent medium for redox active species containing transition metal center. We calculated G ex and DG mix for three different ionic liquids with solubility order:…”

“…46 According to our calculations, the ionic liquids containing imidazolium cation and [NTf 2 ] À are found to show greater solubility of redox active species in them and our results are found to follow the trend already reported in the experimental paper. 13,[15][16][17][18]54 We calculated the excess free energy (G ex ) and free energy of mixing ]. The present model was also able to explain the solvation mechanism in those systems.…”

“…Also the solubility measurement of metal complexes in ionic liquids is a challenging task to do experimentally due to the slow diffusivity of the redox active species through ionic liquids in certain cases. 12,16,18 Therefore, the model can be used as a very efficient predictive tool for solubility calculations of metal complex in ionic liquids, to screen ionic liquids for the best solubility of certain metal complexes and to study the solvation mechanism of the metal complexes in the ionic liquid and organic solvent.…”

The Polycyclic Polyprenylated Acylphloroglucinol Antibiotic PPAP 23 Targets the Membrane and Iron Metabolism in Staphylococcus aureus

“…We therefore postulate that PPAP 23 exerts its antimicrobial activity in the iron-free form; PPAP 23 could bind to Fe-ions and that this binding neutralizes its antimicrobial activity. The hydrophilic shell of PPAP 23 shown in Figure 6A is most likely involved in the chelating Fe 3+ since the 1,3-diketone motif is known to be a potent bidentate ligand for Fe (+3)-salts (Tachikawa et al, 2018). The iron chelating capability was further confirmed by the crystal structure of Fe 3+ bound PPAP 23 analog (Figure 6B).…”

Electrodeposition of Metals and Preparation of Metal Nanoparticles in Nonaqueous Electrolytes and Their Application to Energy Devices

“…We investigated the electrodeposition of various metals and the electrochemical behaviors of metal ions using RTILs composed of aliphatic cations and TFSA anion, which have a high reduction stability and relatively low viscosity. [42][43][44][45][46][47][48][49][50][51][52][53] Pd and Pt are two of the important metals used in scientific and industrial fields owing to their good physical and chemical properties such as corrosion and wear resistance. Therefore, the electrodeposition of Pd and Pt from RTILs has been extensively investigated; however, the precursor metal salts were limited to halogeno complexes.…”