Fig. 2. Molecular structure of the racemic, disordered 1 : 1 co-crystal of 2·K1 and 2·K2, in the solid state at 100 K. Hydrogen atoms are omitted for clarity. Only one of the two disordered B(Mes)2 groups is shown. The central [K(18-crown-6)]+ moiety is disordered by 50% via inversion symmetry, with the K atom shifted off-center towards the [5]-helicene molecules. Both centrosymmetric configurations, each occupied by 50%, are shown.
