Crystal structure of di-μ-chlorido-bis-{chlorido-[(-)-5,6-pinenebi-pyridine]-cobalt(II)} aqua-dichlorido[(-)-5,6-pinenebi-pyridine]cobalt(II).

The crystal structure of [Co(2)Cl(4)(C(17)H(18)N(2))(2)][CoCl(2)(C(17)H(18)N(2))(H(2)O)] or [Co(L)Cl(μ-Cl)](2)[Co(L)(Cl)(2)(OH(2))], where L is the enanti-opure bidentate ligand (-)-5,6-pinenebi-pyridine (C(17)H(18)N(2)), has been determined. Crystals suitable for X-ray structure analysis were obtained by slow evaporation of an ethano-lic solution containing equimolar amounts of L and CoCl(2)·6H(2)O. The Co(II) cations all have a coordination number of five, and in each case the coordination polyhedron is a trigonal bipyramid. The Co-N bonds lengths range from 2.037†(7) to 2.195†(7)†à , and Co-Cl bonds lengths range from 2.284†(2) to 2.509†(2)†à . The asymmetric unit contains two discrete complexes, one dinuclear and the other mononuclear. Between the two mol-ecules, two types of inter-molecular inter-actions have been evidenced: π-π stackings involving the bi-pyridine units, and O-H⋯Cl hydrogen bonds between the hydrogen atoms of the aqua ligand coordinating to the mononuclear complex and the non-bridging chlorido ligand coordinating to the dinuclear mol-ecule. These inter-actions lead to a two-dimensional supra-molecular arrangement parallel to the ab plane.