Electrochemical Survey of Ln3+ (Ln = Dy, Er, Gd, Ho, Tb, Tm) in a Bis(trifluoromethylsulfonyl)imide-Based Room-Temperature Ionic Liquid with and without Added Chloride Ion
Year: 2025
Type: article
Abstract: Electrochemical measurements were used to probe the solvation by chloride and the accessible oxidation states of Dy, Er, Gd, Ho, Tb, and Tm in a room-temperature ionic liquid (RTIL) based on the 1-ethyl-3-methylimidazolium cation (EtMeIm+) and the bis(trifluoromethylsulfonyl)amide anion (Tf2N−). Controlled potential coulometry indicated that all these lanthanide (Ln) metals were oxidized into the RTILs as the corresponding Ln3+ species. Amperometric titration experiments with added Cl− revealed that this anion coordinates with each Ln3+ to form a likely octahedral complex represented as [LnCl6]3−. Of the Ln3+ solutions that were prepared by CPC, cyclic staircase voltammetry indicated that only Tm3+ exhibited electrochemical activity within the potential window of the solvent. Thus, we report here the first electrochemical investigation of the Tm3+/2+ reaction in an anhydrous low melting ionic liquid. The reduction of Tm3+ to Tm2+ is complicated by the disproportionation of the Tm2+ to Tm3+ and Tm0. The latter appears to react with the ionic liquid cation.
Authors: Heather Hamilton, Charles L. Hussey
Language: English
Subfield: Catalysis
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $1,950
OpenAlex ID: W4408869786