Received 6 January 2013
The asymmetric unit of the title compound, [CuBr2(C6H7N)2], contains one half-molecule, the whole molecule being generated by inversion through a center located at the CuII atom. The geometry around the CuII atom is square planar. Semicoordinate CuBr bonds [3.269 (1) Å] and nonclassical C-HBr hydrogen bonds connect the molecules, forming chains running parallel to the a axis. These chains are further linked via additional C-HBr hydrogen bonds into a three-dimensional network.
The title compound was prepared to investigate chloro-methyl and bromo-methyl exchange rules in the crystal structures of [Cu(3YP)2Br2] complexes (where 3YP = 3-substituted pyridine and Y = Cl, Br and methyl), see: Awwadi et al. (2006, 2011). Desiraju showed that the chloro-methyl exchange rule is obeyed if the final structure is stabilized by dispersive forces, see: Desiraju & Sarma (1986). For related structures, see: Marsh et al. (1981, 1982); Singh et al. (1972).
Data collection: SMART (Bruker, 2002); cell refinement: SAINT-Plus (Bruker, 2001); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: LR2097 ).
The author thanks Brendan Twamley for collecting the X-ray diffraction data set.
Awwadi, F. F., Willett, R. D., Haddad, S. F. & Twamley, B. (2006). Cryst. Growth Des. 6, 1833-1838.
Awwadi, F. F., Willett, R. D. & Twamley, B. (2011). Cryst. Growth Des. 11, 5316-5323.
Bruker (2002). SMART. Bruker AXS Inc., Madison, Wisconsin, USA.
Bruker (2001). SADABS and SAINT-Plus. Bruker AXS Inc., Madison, Wisconsin, USA.
Desiraju, D. & Sarma, J. A. (1986). Proc. Indian Acad. Sci. (Chem. Sci.), 96, 599-605.
Marsh, W. E., Hatfield, W. E. & Hodgson, D. J. (1982). Inorg. Chem. 21, 2679-2684.
Marsh, W. E., Valente, E. J. & Hodgson, D. J. (1981). Inorg. Chim. Acta, 51, 49-53.
Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.
Singh, P., Jeter, D. Y., Hatfield, W. E. & Hodgson, D. J. (1972). Inorg. Chem. 11, 1657-1661.