Tonic liquids may have future applications in lithium- ion batteries. A combination of Li[N(SO2CF3)2] and LEMImJLN(SO2CF3)2J (EMim = l-ethyl-3- methylimidazolium ion) has been used as a model for a room temperature ionic liquid electrolyte. From this mixture, crystals of Li2[EMIm] [N(SO2CF3)213 have been isolated. The structure (X- ray diffraction) shows each Li 1 ion to be in a 5- coordinate environment, bound by [N(SO2CF3)2J~ ions. The latter adopt either bi- or monodentate modes and coordinate through O-donors.
(a) When adopting a bidentate mode, why is it more favourable for a [N(SO2CF3)2] ligand (Fig. 9.8d) to coordinate through two O atoms attached t o different S atoms rather than through the two O atoms of one CF3SO2 group?
(b) What coordination geometries are usually associated with a coordination number of 5? Comment on the energy difference(s) between them,
(c) The diagrams below show the two possible arrangements of CF3 groups when [N(SO2CF3)2] acts as an 0,0'-donor to metal ion M" + . Explain how these arise.
[Data: K. Matsumoto et al. (2006) Solid Stale Sci., vol. 8, p. 11O31
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