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    Alkali metal alkoxyborate ester salts; a contemporary look at old compounds

    96768.pdf (1.255Mb)
    Access Status
    Open access
    Authors
    Berger, Amanda
    Ibrahim, Ainee
    Hales, Thomas A.
    D'Angelo, A.M.
    Buckley, Craig E.
    Paskevicius, Mark
    Date
    2024
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Berger, A. and Ibrahim, A. and Hales, T.A. and D'Angelo, A.M. and Buckley, C.E. and Paskevicius, M. 2024. Alkali metal alkoxyborate ester salts; a contemporary look at old compounds. Dalton Transactions. 53 (8): pp. 3638-3653.
    Source Title
    Dalton Transactions
    DOI
    10.1039/d3dt03721e
    ISSN
    1477-9226
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP230100429
    URI
    http://hdl.handle.net/20.500.11937/97004
    Collection
    • Curtin Research Publications
    Abstract

    Research into the use of sodium tetraalkoxyborate salts for different chemical applications including synthetic catalysis, hydrogen storage, or battery applications has been investigated, however, understanding of the structural, thermal and electrochemical properties of these salts has been lacking since the 1950s and 1960s. A review of the synthesis, as well as a thorough characterization using 1H NMR, 11B NMR, 13C{1H} NMR, FTIR, XRD, in situ XRD, DSC-TGA, RGA-MS, TPPA, and EIS has newly identified polymorphic phase changes for Na[B(OMe)4], K[B(OMe)4], Li[B(OMe)4], Na[B(OEt)4], Na[B(OBu)4], and Na[B(OiBu)4]. The crystal structure of K[B(OMe)4] was also solved in I41/a (a = 22.337(2) Å, c = 7.648(3) Å, V = 3815.6(4) Å3, ρ = 1.128(1) g cm−3). Ionic conductivity of the different salts was analyzed, however it was found that the compounds with longer alkyl chains had no measurable ionic conductivity compared to the shorter chained samples, Na[B(OMe)4] and K[B(OMe)4] with 9.6 × 10−8 S cm−1 and 1.6 × 10−7 S cm−1, at 114 °C respectively.

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