Crystal structure of the Ba(II)-based Co(II)-containing one-dimensional coordination polymer poly[[aqua{μ(4)-2,2′-[(4,10-dimethyl-1,4,7,10-tetra­aza­cyclo­dodecane-1,7-di­yl)bis(methylidene)]bis­(4-oxo-4H-pyran-3-olato)}­perchloratocobaltbarium] perchlorate]

The title compound, {[Ba{Co(H(-2) L1)}(ClO(4))(H(2)O)]ClO(4)}(n), L1 = 4,10-bis­[(3-hy­droxy-4-pyron-2-yl)meth­yl]-1,7-dimethyl-1,4,7,10-tetra­aza­cyclo­dodeca­ne, is a one-dimensional coordination polymer. The asymmetric unit consists of a {Ba[Co(H(–2) L1)](ClO(4))(H(2)O)}(+) cationic fragment and a non-coordinating ClO(4) (−) anion. In the neutral [Co(H(–2) L1)] moiety, the cobalt ion is hexa­coordinated in a trigonal–prismatic fashion by the surrounding N(4)O(2) donor set. The Ba(2+) ion is nine-coordinated and exhibits a distorted [BaO(9)] monocapped square-anti­prismatic geometry, the six oxygen atoms coming from three distinct [Co(H(–2) L1)] moieties, while the remaining three vertices are occupied by the oxygen atoms of a bidentate perchlorate anion and a water mol­ecule. A barium–μ(2)-oxygen motif develops along the a axis, connecting symmetry-related dinuclear Ba(II)–Co(II) cationic fragments in a wave-like chain, forming a one-dimensional metal coordination polymer. Non-coordinating ClO(4) (−) anions are located in the space between the chains. Weak C—H⋯O hydrogen bonds involving both coordinating and non-coordinating perchlorate anions build the whole crystal architecture. To our knowledge, this is the first example of a macrocyclic ligand forming a Ba(II)-based one-dimensional coordination polymer, containing Co(II) ions surrounded by a N(4)O(2) donor set.