Bis(azido-κN)bis[4-(dimethylamino)pyridine-κN]zinc

In the title complex, [Zn(N3)2(C7H10N2)2], the ZnII atom is coordinated by two N atoms from two 4-(dimethylamino)pyridine (DMAP) ligands and by two N atoms from two azide anions in a distorted tetrahedral coordination geometry. In the crystal, weak C—H⋯N hydrogen bonds between the DMAP and azide ligands link these discrete complex molecules into a three-dimensional supramolecular network.

In the title complex, [Zn(N 3 ) 2 (C 7 H 10 N 2 ) 2 ], the Zn II atom is coordinated by two N atoms from two 4-(dimethylamino)pyridine (DMAP) ligands and by two N atoms from two azide anions in a distorted tetrahedral coordination geometry. In the crystal, weak C-HÁ Á ÁN hydrogen bonds between the DMAP and azide ligands link these discrete complex molecules into a three-dimensional supramolecular network.
The crystal structure can be described as double layers which stack along the b axis, at c = 1/4 and 3/4, where each layer is formed of pairs of monomers ( Figure 2). In the structure of (I), mononuclear units are held together with weak intermolecular C-H···N hydrogen bonds between the 4-dimethylaminopyridine and the azide, forming an alternating centrosymmetric rings in two-dimensional network which can be described by the graph-set motif R 2 2 (12) and R 6 6 (44) (Bernstein et al., 1995) (Figure 3). The combination of the four intermolecular C-H···N hydrogen bonds generates a three-dimensional network.

Experimental
The title compound is prepared by reaction of methanolic solution containing Zn(CH 3 COO) 2 .2H 2 O, NaN 3 and 4-dimethylaminopyridine in a 1:1:1 stoichiometric ratio. The solution was maintained in 293 K under agitation during one hour. Colorless crystals were appeared by evaporation of the solution at room temperature over the course of a few days.

Refinement
The H atoms were placed at calculated positions with C-H = 0.93 and 0.96 Å, for aromatic and methyl H atoms, respectively, and refined in riding mode with U iso (H) = 1.2U eq (C) for aromatic H atoms and 1.5U eq (C) for methyl H atoms.

Figure 1
The asymmetric unit of the title structure with the atom numbering scheme. Displacement ellipsoids are drawn at the 50% probability level and H atoms are represented as small spheres of arbitrary radii.  Part of the crystal structure, showing the aggregation of R 2 2 (12) and R 6 6 (44) hydrogen-bonding motifs. [Symmetry codes: