Spectra-structure relationship: Syntheses, characterization, single crystal X-ray structural studies and packing analyses of two novel copper(II) complexes: [Cu(pyridine)2(H2O)4](p-toluenesulfonate)2 and [Cu(β-picoline)2(H2O)4](p-toluenesulfonate)2

X-ray structural studies revealed the presence of uncoordinated p-toluenesulfonate anions in both of the crystal structures. The copper cations coordinate to two py/β-pic and four water molecules; the six donor atoms span as a distorted octahedron in both case. The crystal packing in both the complexes 1 and 2 are stabilized by CHO, CHπ and ππ stacking interactions besides electrostatic forces of attraction.