Figure 7
Part of the crystal structure of (III), showing the formation by the anions of a (010) sheet containing four different types of ring. For the sake of clarity, the H atoms bonded to the C atoms are omitted, as are the intra-anion O—H⋯O hydrogen bonds. The atoms marked with an asterisk (*), a hash (#), a dollar sign ($) or an ampersand (&) are at the symmetry positions (x, y, 1 + z), (x, y, -1 + z), (1 + x, y, z) and (-1 + x, y, z), respectively. |