cis-(Di-2-pyridylamine-κ2 N 2,N 2′)bis(thiocyanato-κS)platinum(II)

In the title complex, [Pt(NCS)2(C10H9N3)], the PtII ion is four-coordinated in a distorted square-planar environment by the two pyridine N atoms of the chelating di-2-pyridylamine (dpa) ligand and two mutually cis S atoms from two linear thiocyanate anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 30.8 (4)°. In the crystal, the complex molecules are stacked in columns along the a axis and are connected by intermolecular N—H⋯N hydrogen bonds, forming supramolecular chains along the b axis.

In the title complex, [Pt(NCS) 2 (C 10 H 9 N 3 )], the Pt II ion is fourcoordinated in a distorted square-planar environment by the two pyridine N atoms of the chelating di-2-pyridylamine (dpa) ligand and two mutually cis S atoms from two linear thiocyanate anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 30.8 (4) . In the crystal, the complex molecules are stacked in columns along the a axis and are connected by intermolecular N-HÁ Á ÁN hydrogen bonds, forming supramolecular chains along the b axis.   Table 1 Selected geometric parameters (Å , ).
In the title complex, [Pt(NCS) 2 (dpa)], the Pt II ion is four-coordinated in a distorted square-planar environment by the two pyridyl N atoms of the chelating dpa ligand and two S atoms from two thiocyanate anions (Fig. 1). The dpa ligand is not planar with the dihedral angle between the least-squares planes of the pyridyl rings being 30.8 (4)°. The thiocyanato ligands are located on the same sides of the PtS 2 N 2 plane and are almost linear with the bond angles <S1-C11-N4 = 177.4 (9)° and <S2-C12-N5 = 177.3 (9)°. The pairs of Pt-N and Pt-S bond lengths are nearly equivalent (Table 1).
The complex molecules are stacked in columns along the a axis and are connected by intermolecular N-H···N hydrogen bonds, forming chains along the b axis ( Fig. 2 and Table 2). In the columns, intermolecular π-π interactions between the pyridine rings are present, the ring centroid-centroid distance being 4.155 (5) Å.

Experimental
To a solution of K 2 PtCl 4 (0.2066 g, 0.498 mmol) in H 2 O (20 ml) and MeOH (10 ml) were added KSCN (0.5232 g, 5.384 mmol) and di-2-pyridylamine (0.0883 g, 0.516 mmol) and stirred for 7 h at room temperature. The formed precipitate was separated by filtration and washed with H 2 O and MeOH, and dried at 50 °C, to give a yellow powder (0.2182 g).
Crystals suitable for X-ray analysis were obtained by slow evaporation from a CH 3 CN solution.