not repeatable and indeed most solutions of 1:1 stoichiometry
did not yield the cocrystal. Preparation of the 2:1 material
appeared yet more complicated and was achieved either by
dissolution of the components in chloroform/hexane solutions
and adding n-hexane to effect a drown-out crystallization or
through cogrinding. The authors confirmed the stoichiometry
of this phase with NMR and reported a unit cell for the
structure but were unable to obtain a full structure solution.
Overall, it appeared difficult to effect controlled crystallization
in this system with both stoichiometry and solvent affecting the
balance of 1:1 and 2:1 cocrystals obtained