Bis(9-amino­acridinium) bis­(pyridine-2,6-dicarboxyl­ato)zincate(II) trihydrate

In the title compound, (C₁₃H₁₁N₂)₂[Zn(C₇H₃NO₄)₂]·3H₂O, the Zn^II ion is six-coordinated with the N₄O₂ donor set being a distorted octa­hedron through two almost perpendicular (r.m.s. deviation of ligand atoms from the mean plane is 0.057 Å) tridentate pyridine-2,6-dicarboxyl­ate ligands [dihedral angle between the ligands = 86.06 (4)°]. The charge is compensated by two 9-amino­acridinium cations protonated on the ring N atom. A variety of inter­molecular contacts, such as ion–ion, N—H...O and O—H...O hydrogen bonds, and π–π stacking [centroid–centroid distances = 3.4907 (9)–4.1128 (8) Å], between cations and between anions, play important roles in the formation of the three-dimensional network.

9-Amino­acridinium bis­(pyridine-2,6-dicarboxyl­ato-κ³O²,N,O⁶)ferrate(III) tetra­hydrate

The asymmetric unit of the title compound, (C₁₃H₁₁N₂)[Fe(C₇H₃NO₄)₂]·4H₂O, contains a 9-amino­acridinium cation, one anionic complex and four uncoordinated water mol­ecules. In the anionic complex, the Fe^III ion is six-coordinated by two almost perpendicular [dihedral angle = 88.78 (7)°] pyridine-2,6-dicarboxyl­ate ligands in a distorted octa­hedral geometry. In the crystal, anions are connected into chains along [10-1] by weak C—H...O inter­actions, which create ten-membered hydrogen-bonded R₂²(10) rings. These chains are linked by three-membered water clusters. The final three-dimensional network is constructed by numerous inter­molecular O—H...O and N—H...O inter­actions.