Figure 9
A packing diagram for (III) , showing the π–π stacking structures of the two independent hydrogen-bonded units. Dashed lines indicate O—H⋯N hydrogen bonds and H atoms not involved in the hydrogen bonds have been omitted. [Symmetry codes: (i) −x + 1, −y + 1, −z + 1; (iv) −x + 1, −y + 1, −z; (v) −x + 2, −y + 1, −z; (vi) −x, −y + 1, −z + 1.] |