Quantifying the Lewis Acidity of Mono-, Di-, and Trivalent Cations in Anhydrous Bis(trifluoromethylsulfonyl)imide Salts

Curry, T. Davis; Cooper, Fynn L.; Lind, Natalie M.; Thach, Colleen L.; Khalife, Celine; Blakemore, James D.

doi:10.1021/acs.inorgchem.5c03576

Quantifying the Lewis Acidity of Mono-, Di-, and Trivalent Cations in Anhydrous Bis(trifluoromethylsulfonyl)imide Salts

Journal Article · Wed Dec 03 00:00:00 EST 2025 · Inorganic Chemistry

DOI:https://doi.org/10.1021/acs.inorgchem.5c03576· OSTI ID:3028325

^[1]; Cooper, Fynn L. ^[1]; Lind, Natalie M. ^[1]; ^[1]; ^[1]; ^[1]

University of Kansas, Lawrence, KS (United States)

While the bis(trifluoromethylsulfonyl)imide anion (TFSI^–; formula [N(SO₂CF₃)₂]^–) has been noted for its practical utility, the use of TFSI^– salts as sources of Lewis acidic metal cations for studies of cation-driven tuning effects has not been reported. Here, the effective Lewis acidity of mono-, di-, and trivalent cations (namely, K⁺, Na⁺, Li⁺, Ba²⁺, Ca²⁺, Mg²⁺, Zn²⁺, La³⁺, Y³⁺, Lu³⁺, and Sc³⁺) in the form of their TFSI^– salts is described, along with quantitative comparisons to salts of several other weakly coordinating anions (namely, SO₃CF₃^–, PF₆^–, and BArF₂₄^–). Triphenylphosphine oxide (TPPO) was used as a ³¹P NMR probe in titration experiments for quantification of key parameters describing the effective Lewis acidity of the salts in acetonitrile (CH₃CN) solutions. Notably, the TFSI^– salts of di- and trivalent cations were found to display strong binding to TPPO with significant speciation and were found to be quite hygroscopic. Taken together, the measurements demonstrate that TFSI^– salts are systematically better/stronger effective Lewis acids than their triflate analogues. And, considering the excellent solubility of TFSI^– salts, these materials appear attractive for further use and development in Lewis-acidity-dependent applications, including catalysis and tuning of multimetallic materials.

View Accepted Manuscript (DOE)

Research Organization:: University of Kansas Center for Research, Inc., Lawrence, KS (United States)

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

Grant/Contract Number:: SC0019169

OSTI ID:: 3028325

Report Number(s):: DOE-JBLAKEMORE-0019169--08

Journal Information:: Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 49 Vol. 64; ISSN 0020-1669; ISSN 1520-510X

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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