Figure 4
Part of the crystal structure of (II), showing the formation of a cyclic centrosymmetric R22(6) dimer. Hydrogen bonds are shown as dashed lines. For the sake of clarity, the unit-cell outline, the DMF components and H atoms not involved in the motif shown have been omitted. Atoms marked with an asterisk (*) are at the symmetry position (−x + 1, −y + 1, −z + 1). |