Choline Fluoride-Ethylene glycol deep eutectic solvent mixture – Synthesis and physicochemical properties

Alfurayj, Ibrahim; Pandian, Rathiesh; Springer, Sarah; Burda, Clemens

doi:10.1016/j.molliq.2023.122454

Choline Fluoride-Ethylene glycol deep eutectic solvent mixture – Synthesis and physicochemical properties

Journal Article · Tue Jun 27 00:00:00 EDT 2023 · Journal of Molecular Liquids

DOI:https://doi.org/10.1016/j.molliq.2023.122454· OSTI ID:2421277

^[1]; ^[2]; Springer, Sarah ^[2]; ^[2]

Case Western Reserve Univ., Cleveland, OH (United States); OSTI
Case Western Reserve Univ., Cleveland, OH (United States)

A critical factor in achieving tunability in DESs is varying the type of hydrogen bond acceptors (HBAs) and donors (HBDs). Choline halides (ChX), such as ChCl and ChBr, have been studied to investigate the effect of the choline anion on DESs. However, ChF-based DESs have been underrepresented in scientific research. ChF has excellent potential, such as high electron affinity, ionization potential, and strong hydrogen bond interactions. Moreover, ChF-based DES can lead to a deeper understanding of DESs due to the NMR-active 19F nuclear spin nature. We report the first synthesis and characterization of choline fluoride-EG (1:2, ChF:EG) DES, which we named “EthalineF.” We studied this mixture using various spectroscopic techniques, including NMR, FT-IR, Raman, and UV–vis spectroscopies. Polarity, density, viscosity, and conductivity measurements were collected as well. Transient absorption spectroscopy (TAS) was used to study the solvation dynamics of EthalineF. 19F NMR indicated that some fluoride anions (~15%) are coordinated to the choline cation. In EthalineF, the new type of observed fluoride anions is proposed to be a tight-binding choline-fluoride ion pair. Further, EthalineF has a larger solvodynamic radius than Ethaline. This can explain the lower conductivity for EthalineF compared to Ethaline despite the higher fluidity and solvation dynamics for EthalineF.

View Accepted Manuscript (DOE)

Research Organization:: Case Western Reserve Univ., Cleveland, OH (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0019409

OSTI ID:: 2421277

Journal Information:: Journal of Molecular Liquids, Journal Name: Journal of Molecular Liquids Journal Issue: C Vol. 386; ISSN 0167-7322

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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