Figure 1
The molecular structures of compounds (I) , (II) , (III) and (IV) determined at 93 K, showing the atom-numbering scheme. Displacement ellipsoids of non-H atoms are drawn at the 50% probability level and H atoms are drawn as circles of arbitrary size. The O—H⋯N hydrogen bonds are indicated by dashed lines. [Symmetry code for (I) : (iii) −x + 1, −y + 1, −z; symmetry code for (IV) : (ii) −x + 1, −y + 1, −z + 1.] |