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Figure 2 . ORTEP drawings of cation F (C20H27N2+) and anion B (C4H3O4-) in the asymmetric unit of (I) showing the atom numbering scheme and 50% probability displacement ellipsoids of non-H atoms. Dashed lines indicate N2F-H2FBO2B intermolecular and O3B-H3BO1B intramolecular hydrogen bond interactions.