Synthesis and crystal structure of poly[[bis­(aqua-κO)tetra­kis­(μ-4,4′-bi­pyridine-κ(2) N:N′)hexa­kis­(3-chloro­benzoato)-κ(5) O;κ(2) O:O′-tricobalt(II)] methanol disolvate]

A novel ladder-chain cobalt(II) coordination polymer, {[Co(3)(C(7)H(4)ClO(2))(6)(C(10)H(8)N(2))(4)(H(2)O)(2)]·2CH(3)OH}( n ), was synthesized and characterized. The structure contains two Co(II) centres with different octa­hedral environments, [Co(1)N(3)O(3)] and [Co(2)N(2)O(4)]. The O-donating 3-chloro­benzoate anions (3-Clbenz) act as the terminal ligands, while the N-donating 4,4′-bipy mol­ecules play the role of linkers. The Co(1) ions are linked by 4,4′-bipy mol­ecules into linear chains. Two such chains are joined by [Co(2)(3-Clbenz)(2)(H(2)O)(2)] units via two 4,4′-bipy bridging ligands, thus forming the ladder-chain structure. The crystal packing of the title compound is stabilized by supra­molecular inter­actions, such as hydrogen bonding, π–π and halogen⋯π contacts, giving a three-dimensional framework. The spectroscopic and thermal properties of the title compound have also been investigated.