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    Aggregation models of potential cyclical trimethylsulfonium dicyanamide ionic liquid clusters

    Date
    2009-02-19
    Author
    Carper, W. Robert
    Langenwalter, Kevin
    Nooruddin, Naveed S.
    Kullman, Michael J.
    Gerhard, Dirk
    Wasserscheid, Peter
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    Citation
    The journal of physical chemistry. B. 2009 Feb 19; 113(7): 2031-41.
    Abstract
    Raman and infrared spectra of trimethylsulfonium dicyanamide [(CH(3))(3)SN(CN)(2)] are reported and accurately reproduced by DFT methods (B3LYP and B3PW91), MP2, and MP3, and to a lesser extent by the RHF method. The (CH(3))(3)SN(CN)(2) ionic liquid forms two isomeric dimers that are of cyclic structure, one of which is 13 kcal/mol lower in energy than the other. Both isomeric cyclic pairs (versions 1 and 2), [(CH(3))(3)SN(CN)(2)](2), have the potential to further combine and form a common structure containing four pairs of (CH(3))(3)SN(CN)(2). This structure can then conceivably undergo a stacking procedure to form extended ionic liquid nanotubes of eight ionic liquids, [(CH(3))(3)SN(CN)(2)](8). The possible formation of gas phase ionic liquid clusters of two, four, and eight trimethylsulfonium dicyanamide ionic liquids is supported by highly exergonic free energy changes obtained from B3LYP/(6-311+G(d,p)) density functional calculations.
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    URI
    http://dx.doi.org/10.1021/jp809215z
    http://hdl.handle.net/10057/4327
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