SYNTHESIS AND CRYSTAL STRUCTURE OF BIS(2,2'-BIPYRIDINE-N,N')DICHLOROMANGANESE(II) COMPLEX WITH FREE 2,2'-BIPYRIDINE

摘要

The title complex [Mn(bipy)_2Cl_2] centre dot 0.5 bipy centre dot 2.5 H_2O, 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-l, with a=8.814(2), b= 11.335(2), c= 13.347(3)A, alpha=76.85(2), beta=89.55(2), gamma=86.52(2) deg. 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) A. A pi-pi interaction is also observed between adjacent bipy rings. The chelating bipy and free bipy showed different IR absorptions.