Bis­(thio­cyanato-κN)[tris(pyridin-2-yl­meth­yl)amine-κ⁴N]­iron(II)

In the title complex, [Fe(NCS)₂(C₁₈H₁₈N₄)], the Fe^II cation is chelated by a tris­(2-pyridyl­meth­yl)amine ligand and coordin­ated by two thio­cyanate anions in a distorted N₆ octa­hedral geometry. In the crystal, weak C—H...S hydrogen bonds and π–π stacking inter­actions between parallel pyridine rings of adjacent mol­ecules [centroid–centroid distance = 3.653 (3) Å] link the mol­ecules into a two-dimensional supra­molecular architecture. The structure contains voids of 124 (9) ų, which are free of solvent molecules.

1,10-Phenanthroline-5,6-dione ethanol monosolvate

In the title compound, C₁₂H₆N₂O₂·C₂H₅OH, the mol­ecule of the 1,10-phenanthroline-5,6-dione is approximately planar, with a maximum deviation of 0.051 (1) Å. In the crystal, mol­ecules are linked by O—H...N and weak C—H...O hydrogen bonds, forming supra­molecular chains propagating along [110]. π–π stacking inter­actions are observed between the pyridine rings of neighbouring chains, the centroid–centroid separations being 3.6226 (11) and 3.7543 (11) Å.

2-[2,6-Bis(pyrazin-2-yl)pyridin-4-yl]benzoic acid

In the title compound, C₂₀H₁₃N₅O₂, the two pyrazine rings are nearly coplanar with the central pyridine ring, forming dihedral angles of 2.21 (9) and 4.57 (9)°. In contrast, the strong steric hindrance caused by the ortho-carboxyl group on the phenyl ring makes this ring rotate out of the attached pyridine ring plane by 52.60 (9)°. The carboxyl group is twisted from the phenyl ring by 22.6 (1)°. In the crystal, aromatic π–π stacking inter­actions [centroid–centroid distances = 3.9186 (4) and 3.9794 (5) Å] occur between the anti­parallel mol­ecules, generating infinite chains along [100]. O—H...O hydrogen bonds connect the chains, leading to the formation of a two-dimensional supra­molecular network parallel to (010). Inter­molecular C—H...N hydrogen bonds are also observed.