(2,2′-Bipyrimidine-κ2 N 1,N 1′)bis(thiocyanato-κN)platinum(II)

In the title complex, [Pt(NCS)2(C8H6N4)], the PtII ion is four-coordinated in a distorted square-planar environment defined by two pyrimidine N atoms derived from a chelating 2,2′-bipyrimidine (bpym) ligand and two mutually cis N atoms from two SCN− anions. The thiocyanate ligands are almost linear, displaying N—C—S bond angles of 178.6 (11) and 173.7 (11)°, and the N atoms are slightly bent coordinated to the Pt atom with Pt—N—C bond angles of 172.7 (9) and 160.4 (10)°. In the crystal, molecules are held together by C—H⋯S hydrogen bonds. Intramolecular C—H⋯N hydrogen bonds are also observed

In the title complex, [Pt(NCS) 2 (C 8 H 6 N 4 )], the Pt II ion is fourcoordinated in a distorted square-planar environment defined by two pyrimidine N atoms derived from a chelating 2,2 0bipyrimidine (bpym) ligand and two mutually cis N atoms from two SCN À anions. The thiocyanate ligands are almost linear, displaying N-C-S bond angles of 178.6 (11) and 173.7 (11) , and the N atoms are slightly bent coordinated to the Pt atom with Pt-N-C bond angles of 172.7 (9) and 160.4 (10) . In the crystal, molecules are held together by C-HÁ Á ÁS hydrogen bonds. Intramolecular C-HÁ Á ÁN hydrogen bonds are also observed
In the title complex, [Pt(NCS) 2 (bpym)], the Pt II ion is four-coordinated in a distorted square-planar environment defined by two pyrimidine N atoms derived from a chelating bpym ligand and two mutually cis N atoms from two SCNanions  Table 2). Intramolecular C-H···N hydrogen bonds are also observed (Table 2).

Experimental
To a solution of K 2 PtCl 4 (0.2087 g, 0.503 mmol) in H 2 O (15 ml) and acetone (15 ml) were added KSCN (0.5071 g, 5.218 mmol) and 2,2′-bipyrimidine (0.0809 g, 0.512 mmol), and refluxed for 3 h. After evaporation of the solvent, the residue was dissolved in CH 3 CN (20 ml), then filtered through a plug of silica gel (2 cm x 7 cm). The solvent of the eluate was removed in vacuo, the residue was washed with ether, and dried at 323 K, to give an orange powder (0.0686 g). Orange block-like crystals, suitable for X-ray analysis, were obtained by slow evaporation of a CH 3 CN solution at room temperature.

Refinement
H atoms were included in calculated positions and treated as riding atoms: C-H = 0.95 Å with U iso (H) = 1.2U eq (C). The highest peak (4.86 e Å -3 ) and the deepest hole (-1.72 e Å -3 ) in the difference Fourier map are located 0.91 Å and 0.79 Å, respectively, from the Pt1 atom.

Computing details
Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT (Bruker, 2000); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and PLATON (Spek, 2009); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).    Table 2 for details). Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å 2 )
x y z U iso */U eq