Synthesis and crystal structure of bis(2,2′-bipyridine-N,N′)dichloromanganese(II) complex with free 2,2′-bipyridine

The title complex [Mn(bipy)(2)Cl-2] . 0.5bipy . 2H(2)O, where bipy = 2,2'-bipyridine, has been prepared and its crystal structure has been determined by X-ray diffraction methods. The complex crystallizes in the triclinic space group P-1, with a=8.814(2), b=11.335(2), c=13.347(3)Angstrom, alpha=76.85(2), beta=89.55(2), gamma=86.52(2)degrees. Two chloride and two bipy ligands cis-coordinate to a Mn(II) atom with a distorted octahedral geometry. The crystal consists of Mn(II) complex, free bipy and crystalline water. The complex crystalline water link to each other by H-bonding to form supra-molecular chains, and free bipy molecules locate between parallel chains with a van der Waals contact distance of 3.58(1)Angstrom. A pi-pi interaction is also observed between adjacent bipy rings. The chelating bipy and free bipy showed different IR absorptions.