Quantification of zwitterion betaine in betaine bis(trifluoromethylsulfonyl)imide and its influence on liquid–liquid equilibrium with water

Lee, Jaeseong; Fairley, Melissa; Goff, George S.; Brennecke, Joan F.

doi:10.1039/d3cc03565d

Quantification of zwitterion betaine in betaine bis(trifluoromethylsulfonyl)imide and its influence on liquid–liquid equilibrium with water

Journal Article · Mon Oct 23 00:00:00 EDT 2023 · ChemComm

DOI:https://doi.org/10.1039/d3cc03565d· OSTI ID:2377311

Lee, Jaeseong ^[1]; Fairley, Melissa ^[2]; Goff, George S. ^[2]; ^[1]

Univ. of Texas, Austin, TX (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

In this study, ionic liquids (ILs) have been proposed as extractants for separation of metals, including rare earth elements. In particular, protonated betaine bis(trifluoromethylsulfonyl)imide ([HBet][TFSI]) exhibits liquid–liquid phase behavior with water that can be tuned by complexation with various metals. Here we show that previously undetected neutral zwitterionic betaine formed during the IL synthesis can affect the phase behaviour. Traditional synthesis of protonated betaine bis(trifluoromethylsulfonyl)imide results in significant amounts of neutral zwitterionic betaine impurity, which dramatically affects phase behavior.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)

Grant/Contract Number:: 89233218CNA000001

OSTI ID:: 2377311

Alternate ID(s):: OSTI ID: 2203988

Report Number(s):: LA-UR--23-28423

Journal Information:: ChemComm, Journal Name: ChemComm Journal Issue: 91 Vol. 59; ISSN 1359-7345

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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