Figure 8
Crystal packing of (a) the triclinic polymorph of p-benzosemiquinone and (b) the triclinic polymorph of quinhydrone viewed normal to the ac plane with symmetry elements shown. In the triclinic p-benzosemiquinone, the disordered H1 proton is drawn in symmetry-equivalent positions to emphasize the symmetry of the hydrogen bond, whereas the population of each site is 0.5. |