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In the binuclear centrosymmetric title compound, [In2(C7H3NO4)2(C7H4NO4)2(H2O)2]·4H2O, which contains both pyridine-2,3-dicarboxyl­ate and 3-carb­oxy­pyridine-2-carboxyl­ate ligands, the InIII atom is six-coordinated in a distorted octa­hedral geometry. One pyridine ligand is N,O-chelated while the other is N,O-chelated and at the same time bridging to the other via the second carboxyl group. In the crystal, an extensive O—H...O hydrogen-bonding network, involving the coordinated and lattice water mol­ecules and the carboxyl groups of the ligands, together with C—H...O and π–π inter­actions [centroid–centroid distance = 3.793 (1) Å], leads to the formation of a three-dimensional structure.

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In the title compound, (C5H7N2)[Fe(C7H3NO4)2] or [2-apyH][Fe(pydc)2], the asymmetric unit contains an [Fe(pydc)2] (pydc is pyridine-2,6-dicarboxyl­ate) anion and a protonated 2-amino­pyridine cation ([2-apyH]+). The complex anion contains an FeIII atom within a distorted octahedral FeN2O4 coordination geometry. N—H...O and C—H...O hydrogen bonding, offset π–π stacking [centroid–centroid distance = 3.805 (13) Å] and C=O...π inter­actions [3.494 (14) Å] generate a three-dimensional network structure.

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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.

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The title compound, [HgCl2(C4H5N3)]n, features a two-dimensional network parallel to (001) that is based on an HgII atom octahedrally coordinated by four μ2-Cl atoms and two μ2-2-amino­pyrimidine (apym) ligands in trans positions, yielding a distorted HgCl4N2 octa­hedron. The coordination network can be described as an uninodal 4-connected net with the sql topology. The HgII ion lies on a site of -1 symmetry and the apym ligand lies on sites of m symmetry with the mirror plane perpendicular to the pyrimidine plane and passing through the NH2 group N atom. This polymeric structure is stabilized by N—H...Cl hydrogen bonds and columnar π–π stacking of pyrimidine rings, with a centroid–centroid distance of 3.832 (2) Å.

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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 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.

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The asymmetric unit of the title complex, (C6H8N)2[Cu(C7H3NO4)2]·6H2O, contains half a copper(II)–dipicolinate complex located on a twofold rotation axis, one protonated aniline mol­ecule and three solvent water mol­ecules. The CuII atom is coordinated by four O atoms and two N atoms from two dipicolinate ligands in a distorted octa­hedral environment. In the crystal, the components are linked into a three-dimensional framework by inter­molecular O—H...O and N—H...O inter­actions.
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