Dichloridobis(2-phenylpyridine-κN)zinc(II)

In the title compound, [ZnCl2(C11H9N)2], the Zn2+ cation lies on a twofold axis and is coordinated by two Cl− anions and the N atoms of two 2-phenylpyridine ligands, forming a ZnN2Cl2 polyhedron with a slightly distorted tetrahedral coordination geometry. The dihedral angle between the phenyl ring and the metal-bound pyridine ring is 50.3 (4)° for each 2-phenylpyridine ligand. This arranges the phenyl ring from one ligand in the complex above the pyridine ring of the other resulting in an intramolecular π–π interaction, with a centroid–centroid distance of 3.6796 (17) Å. Weak C—H⋯Cl hydrogen bonds stabilize the crystal packing, linking molecules into chains along the c axis.

In the title compound, [ZnCl 2 (C 11 H 9 N) 2 ], the Zn 2+ cation lies on a twofold axis and is coordinated by two Cl À anions and the N atoms of two 2-phenylpyridine ligands, forming a ZnN 2 Cl 2 polyhedron with a slightly distorted tetrahedral coordination geometry. The dihedral angle between the phenyl ring and the metal-bound pyridine ring is 50.3 (4) for each 2-phenylpyridine ligand. This arranges the phenyl ring from one ligand in the complex above the pyridine ring of the other resulting in an intramolecularinteraction, with a centroid-centroid distance of 3.6796 (17) Å . Weak C-HÁ Á ÁCl hydrogen bonds stabilize the crystal packing, linking molecules into chains along the c axis.

Experimental
Crystal data [ZnCl 2 (C 11   Data collection: SMART (Bruker, 2000); cell refinement: SAINT (Bruker, 2000); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: metal-organic compounds Dichloridobis(2-phenylpyridine-κN)zinc(II) Sivanesan Dharmalingam, Ha-Jin Lee and Sungho Yoon Comment 2-Phenylpyridine coordinated metal complexes of Ir III and Pt II are well known for their intense photoluminescence (Samha et al., 1993;Yoshinari et al., 2010;Zhao et al., 2008). A four coordinate Pt II square planar metal complex has also been reported with two 2-phenylpyridine and two Clligands (Yoshinari et al. 2010). Complexes with substituted 2phenylpyridine ligands have also been reported (Santoro et al., 2011). Here, we report the structure of a tetrahedrally coordinated Zn 2+ complex which crystallizes in the tetragonal space group I4 1 cd with one half molecule in the asymmetric unit. Bond distances to the metal are given in Table 1 with the structure of the molecule shown in Fig 1 and its crystal packing involving weak intermolecular C-H···Cl interactions detailed in Fig 2 and Table 2.

Experimental
To a solution of 2-phenylpyridine (1.56 ml, 11.0 mmol) in 30 mL of acetonitrile, ZnCl 2 (0.50 g, 3.6 mmol) was added at room temperature. After three hours, acetonitrile was removed under reduced pressure and crystals were collected from a dichloromethane and pentane layering system. Colorless block-like crystals. Yield = 90%, (1.45 g).

Refinement
The H atoms were placed at calculated positions and refined as riding with C-H = 0.95 Å [Uiso(H) = 1.2 Ueq(C)].

Dichloridobis(2-phenylpyridine-κN)zinc(II)
Crystal data [ZnCl 2 (C 11  where P = (F o 2 + 2F c 2 )/3 (Δ/σ) max < 0.001 Δρ max = 0.37 e Å −3 Δρ min = −0.36 e Å −3 Absolute structure: Flack (1983), 997 Friedel pairs Flack parameter: 0.02 (2) Special details Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. 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.