Bis(2-amino-6-methylpyridinium)tetrabromidocuprate(II)

In the crystal structure of the title compound, ( C6H9N2) 2[ CuBr4], the geometry around the Cu atom is intermediate between tetrahedral ( T-d) and square planar ( D-4h). Each [CuBr4](2-) anion is connected non- symmetrically to four surrounding cations through N-H center dot center dot center dot X ( pyridine and amine proton) hydrogen bonds, forming chains of the ladder-type running parallel to the crystallographic b axis. These layers are further connected by means of offset face-to-face interactions ( parallel to the a axis), giving a three-dimensional network. Cation pi -pi stacking [centroid separations of 3.69 ( 9) and 3.71 (1) angstrom] and Br center dot center dot center dot aryl interactions [ 3.72 ( 2) and 4.04 (6)angstrom] are present in the crystal structure. There are no intermolecular Br center dot center dot center dot Br interactions.