Figure 5
A view of the structure of polymorph (IVa); intramolecular hydrogen-bonding interactions between the phenol and aldehyde functions are shown as dashed lines. Dotted lines show interatomic distances in the range 3.42–3.47 Å in the π–π overlap region. Displacement ellipsoids are drawn at the 50% probability level. [Symmetry codes: (viii) 2 − x, − y, z; (ix) 2 − x, 1 − y, −z.] |