Syntheses, Weak Interactions, and Crystal Structures of Two Tetrabromocuprate(II) Complexes Containing Benzyl Substituted Alkyl Pyridinium

Two tetrabromocuprate(II) complexes containing substituted benzyl alkyl pyridinium, [Bz-4-MePy](2)[CuBr4] (1) and [Bz-4-EtPy](2)[CuBr4] (2) ([Bz-4MePy](+) = (1-benzyl-4 '-methylpyridinium) [Bz-4-EtPy](+) = 1-benzyl-4 '-ethylpyridinium), were crystallized from methanol and dilute HBr solutions, and were determined by single crystal X-ray diffraction. Two complexes crystallize in the orthorhombic system with space group Pna2(1), and comprise two tortuous cations and one tetrahedral [CuBr4](2-) anion. The [CuBr4](2-) anions in two complexes form a linear chain by Br center dot center dot center dot Br interaction with the distance of 4.001 angstrom for 1 and 4.062 angstrom for 2, while the combination of C-H center dot center dot center dot Br and C-H center dot center dot center dot N weak hydrogen bonds, p center dot center dot center dot pi and pi center dot center dot center dot pi, interactions consolidate the crystal packing and results in a 3D network structure.