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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.

acta crystallographica. section e, crystallographic communications

Synthesis and crystal structure of poly[[bis(aqua-κO)tetrakis(μ-4,4′-bipyridine-κ2 N:N′)hexakis(3-chlorobenzoato)-κ5 O;κ2 O:O′-tricobalt(II)] methanol disolvate]