Dianilinedibromidozinc(II)

In the title compound, [ZnBr2(C6H7N)2], the Zn atom (site symmetry 2) adopts a distorted tetrahedral ZnN2Br2 geometry. In the crystal, molecules are linked by N—H⋯Br hydrogen bonds, generating sheets containing R 2 2(8) loops.


Comment
Researches have worked on synthesis and X-ray studies of organo-zinc complexes for their applications in catalysis (Ibrahim et al., 2003, Park et al., 2008 and supramolecular chemistry (Nesterova et al., 2005). These complexes act as fluorescent probe for labeling proteins (Wu et al., 2008). Herein, we report the synthesis and crystal structure of the title compound, (I).
The molecular structure of (I) is presented in Fig. 1. The compound crystallizes in the space group C2/c with Z' = 1/2.
The Zn II ion is located on a 2-fold axis and is coordinated by two Br atoms [Zn1-Br/Br1 iii = 2.3851 (3) Å] and two amino N atoms from aniline ligands [Zn1-N1/N1 iii = 2.057 (2) Å] [symmetry code: (iii) 1 -x, y, 3/2 -z]. The geometry around the Zn II ion is that of a tetrahedron. The benzene ring plane is approximately planar, with maximum deviation from the least-squares plane being 0.004 (2)Å for atom C2.

Experimental
Zinc bromide (1.125 g, 5 mmol) was added to distilled water (20 ml). Aniline (0.93 g, 10 mmol) was added to the above solution and stirred at room temperature for 5 minutes. White precipitate formed was filtered off, washed with distilled water, dried and recrystallized in methanol to yield colourless blocks of (I).

Refinement
All C-bonded H atoms were refined using a riding model, with C-H distances constrained to 0.93Å and with U iso = 1.2U eq (C). Amino H atoms were located in difference map and refined freely.   Table 1.)