The asymmetric unit of the title compound, (C13H11N2)2[Mn(C7H3NO4)2]·3H2O, consists of a discrete mononuclear [Mn(2,6-pydc)2]2− anionic complex (2,6-pydc is pyridine-2,6-dicarboxylate) associated with two 9-aminoacridinium counter-ions for neutralization of charge and three uncoordinated water molecules. The MnII atom is six-coordinated by (2,6-pydc)2− anions in a tridentate fashion and is at the centre of a distorted octahedron formed by the MnO4N2 bonding set. In the crystal, various intermolecular interactions between different moieties can be found, such as different kinds of hydrogen bonds, offset or slipped π–π [centroid–centroid distances in the range 3.3704 (12) to 3.8674 (13)Å] and C=O⋯π [3.563 Å] interactions, which lead to the formation of a three-dimensional supramolecular network.
In the title compound, (C13H11N2)2[Zn(C7H3NO4)2]·3H2O, the ZnII 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.
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 FeIII 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 R
2
2(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.
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