Figure 3
Intermolecular hydrogen-bonding interactions (dashed lines) between the hydrogen atoms of the ammonio group of the boron cluster anions and the oxygen atoms of the ketone functions. Displacement ellipsoids are drawn at the 50% probability level and hydrogen atoms are shown with arbitrary radii. Symmetry codes: (a) x, − y, z; (b) 1 − x, − + y, − z; (c) − + x, y, − z. |