No abstract

In the title compound, (C5H7N2)2[CoCl4], the cobalt(II) ion is coordinated by four chloride ions in a slightly distorted tetra­hedral geometry. The crystal packing is stabilized by inter­molecular N—H⋯Cl hydrogen bonding, forming a three-dimensional network. The crystal was a non-merohedral twin emulating tetra­gonal symmetry, but being in fact ortho­rhom­bic.

The asymmetric unit of the title compound, C5H7N2 +·C6H6NO3S−·C6H7NO3S·H2O, contains one 4-ammonio­benzene­sulfonate zwitterion (+H3NC6H4SO3 −), one 4-amino­benzene­sulfonate anion (H2NC6H4SO3 −), one 4-amino­pyridinium cation and two half-mol­ecules of water, each lying on a twofold rotation axis. The various ions and molecules in the structure are linked through N—H⋯O, N—H⋯N and N—H⋯S hydrogen bonds and C—H—π inter­actions into a three-dimensional framework.

In the crystals of the title compound, C5H7N2 +·CNS−·C5H6N2, the components are linked by three N—H...N and two N—H...S hydrogen bonds, resulting in two interpenetrating three-dimensional networks. Hirshfeld surface analysis shows that the most important contributions to the crystal packing are from H...H (36.6%), C...H/H...C (20.4%), S...H/H...S (19.7%) and N...H/H...N (13.4%) interactions.

In the title compound, [Ni2(CO3)(C5H6N2)8(H2O)]Cl2·5H2O, one of the the NiII ions is six-coordinated in a distorted octa­hedral geometry, with the equatorial plane defined by four pyridine N atoms from four amino­pyridine ligands, the axial positions being occupied by one water O and a carbonate O atom. The other NiII ion is also six-coordinated, by four other pyridine N atoms from four other amino­pyridine ligands and two carbonate O atoms to complete a distorted octa­hedral geometry. In the crystal structure, mol­ecules are linked into an infinite three-dimensional network by O—H⋯O, N—H⋯Cl, N—H⋯O, O—H⋯N, C—H⋯O, C—H⋯N and C/N—H⋯π inter­actions involving the pyridine rings.