Tetra­bromido(di-2-pyridyl­amine-κ²N²,N^2′)platinum(IV)

The Pt^IV ion in the title complex, [PtBr₄(C₁₀H₉N₃)], is six-coordinated in a slightly distorted octa­hedral environment by two pyridine N atoms from a chelating di-2-pyridyl­amine (dpa) ligand and four Br⁻ anions. The complex mol­ecule has mirror symmetry, with the Pt^IV atom, two Br atoms and the central N atom of the dpa ligand lying on the mirror plane. The dpa ligand is not planar, showing a dihedral angle of 34.7 (2)° between the pyridine rings. The complex mol­ecules are connected by inter­molecular N—H...Br hydrogen bonds, forming chains along [001]. Inter­molecular C—H...Br hydrogen bonds and π–π inter­actions between the pyridine rings [centroid–centroid distance = 3.667 (4) Å] are also observed.

(Di-2-pyridyl­amine-κ²N²,N^2′)diiodidopalladium(II)

The Pd^II ion in the title complex, [PdI₂(C₁₀H₉N₃)], is four-coordinated in a distorted square-planar environment defined by the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and two I⁻ anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 51.2 (2)°. In the crystal, pairs of complex mol­ecules are assembled through inter­molecular N—H...I hydrogen bonds into dimeric species. The complexes are stacked in columns along the b axis and display several inter­molecular π–π inter­actions between the pyridine rings, with a shortest ring centroid–centroid distance of 3.957 (3) Å.

Bis(di-2-pyridyl­amine-κ²N²,N^2′)palladium(II) bis­(thio­cyanate)

The Pd^II atom of the title salt, [Pd(C₁₀H₉N₃)₂](NCS)₂, lies on a center of inversion and exists in a square-planar environment defined by the four pyridine N atoms derived from the two chelating di-2-pyridyl­amine (dpa) ligands. The chelate ring displays a boat conformation with a dihedral angle between the pyridine rings of 43.0 (1)°. Adjacent thio­cyanate ions are linked to the cations by N—H...N hydrogen bonds.

cis-Dibromidobis(2-phenyl­pyridine-κN)platinum(II)

In the title complex, [PtBr₂(C₁₁H₉N)₂], the Pt^II ion has a distorted cis-Br₂N₂ square-planar coordination geometry defined by two N atoms from two 2-phenyl­pyridine (ppy) ligands and two Br⁻ anions. The ppy ligands are not planar, the dihedral angles between the pyridine and benzene rings being 49.0 (3) and 47.3 (3)°. In the crystal, the complex mol­ecules are stacked in columns along the a axis. In the columns, there are numerous intra- and inter­molecular π–π inter­actions between the six-membered rings, the shortest ring centroid–centroid distance being 3.774 (6) Å.