Ion-induced fragmentation of imidazolium ionic liquids: TOF-SIMS study

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Abstract

An upgraded TOF-SIMS VG Ionex IX23LS was used to study the fragmentation patterns of a series of asymmetric imidazolium ionic liquids [C(n)mim][Tf2N], where n = 2, 4, 6, and 8, under bombardment by Ga+ ions with energies of 10-20 keV. Analysis of positive and negative secondary ion mass spectra showed that fragmentation of cations and anion proceeds via both one- and two-bond cleavage of molecular backbone. In addition, formation of methylene adducts [C(n)mim(CH2)(x)](+), where x = 1-3, and associates containing anion constituents [C(n)mimO](+) and [C(n)mimF](+) was revealed. Lengthening of alkyl chain was found to result in a stronger fragmentation of cations, while the extent of ion-induced fragmentation of anion decreased with an increase of the n-value and with a decrease in the projectile impact energy.
Original languageUnknown
Pages (from-to)19-25
JournalInternational Journal of Mass Spectrometry
Volume353
Issue numberNA
DOIs
Publication statusPublished - 1 Jan 2013

Keywords

    Cite this

    @article{9eada7a2a2a44d45a35d62ef235aa01f,
    title = "Ion-induced fragmentation of imidazolium ionic liquids: TOF-SIMS study",
    abstract = "An upgraded TOF-SIMS VG Ionex IX23LS was used to study the fragmentation patterns of a series of asymmetric imidazolium ionic liquids [C(n)mim][Tf2N], where n = 2, 4, 6, and 8, under bombardment by Ga+ ions with energies of 10-20 keV. Analysis of positive and negative secondary ion mass spectra showed that fragmentation of cations and anion proceeds via both one- and two-bond cleavage of molecular backbone. In addition, formation of methylene adducts [C(n)mim(CH2)(x)](+), where x = 1-3, and associates containing anion constituents [C(n)mimO](+) and [C(n)mimF](+) was revealed. Lengthening of alkyl chain was found to result in a stronger fragmentation of cations, while the extent of ion-induced fragmentation of anion decreased with an increase of the n-value and with a decrease in the projectile impact energy.",
    keywords = "Stopping power, Imidazolium ionic liquids, Ga+ primary ions, Ion-induced fragmentation, TOF-SIMS",
    author = "Augusto Moutinho and Nenad Bundaleski and Teodoro, {Orlando Manuel Neves Duarte}",
    note = "Sem PDF conforme Despacho",
    year = "2013",
    month = "1",
    day = "1",
    doi = "10.1016/j.ijms.2013.05.029",
    language = "Unknown",
    volume = "353",
    pages = "19--25",
    journal = "International Journal of Mass Spectrometry",
    issn = "1387-3806",
    publisher = "Elsevier Science B.V., Amsterdam.",
    number = "NA",

    }

    TY - JOUR

    T1 - Ion-induced fragmentation of imidazolium ionic liquids: TOF-SIMS study

    AU - Moutinho, Augusto

    AU - Bundaleski, Nenad

    AU - Teodoro, Orlando Manuel Neves Duarte

    N1 - Sem PDF conforme Despacho

    PY - 2013/1/1

    Y1 - 2013/1/1

    N2 - An upgraded TOF-SIMS VG Ionex IX23LS was used to study the fragmentation patterns of a series of asymmetric imidazolium ionic liquids [C(n)mim][Tf2N], where n = 2, 4, 6, and 8, under bombardment by Ga+ ions with energies of 10-20 keV. Analysis of positive and negative secondary ion mass spectra showed that fragmentation of cations and anion proceeds via both one- and two-bond cleavage of molecular backbone. In addition, formation of methylene adducts [C(n)mim(CH2)(x)](+), where x = 1-3, and associates containing anion constituents [C(n)mimO](+) and [C(n)mimF](+) was revealed. Lengthening of alkyl chain was found to result in a stronger fragmentation of cations, while the extent of ion-induced fragmentation of anion decreased with an increase of the n-value and with a decrease in the projectile impact energy.

    AB - An upgraded TOF-SIMS VG Ionex IX23LS was used to study the fragmentation patterns of a series of asymmetric imidazolium ionic liquids [C(n)mim][Tf2N], where n = 2, 4, 6, and 8, under bombardment by Ga+ ions with energies of 10-20 keV. Analysis of positive and negative secondary ion mass spectra showed that fragmentation of cations and anion proceeds via both one- and two-bond cleavage of molecular backbone. In addition, formation of methylene adducts [C(n)mim(CH2)(x)](+), where x = 1-3, and associates containing anion constituents [C(n)mimO](+) and [C(n)mimF](+) was revealed. Lengthening of alkyl chain was found to result in a stronger fragmentation of cations, while the extent of ion-induced fragmentation of anion decreased with an increase of the n-value and with a decrease in the projectile impact energy.

    KW - Stopping power

    KW - Imidazolium ionic liquids

    KW - Ga+ primary ions

    KW - Ion-induced fragmentation

    KW - TOF-SIMS

    U2 - 10.1016/j.ijms.2013.05.029

    DO - 10.1016/j.ijms.2013.05.029

    M3 - Article

    VL - 353

    SP - 19

    EP - 25

    JO - International Journal of Mass Spectrometry

    JF - International Journal of Mass Spectrometry

    SN - 1387-3806

    IS - NA

    ER -