Crystal Structure Of The Ba-Ii-Based Co-Ii-Containing One-Dimensional Coordination Polymer Poly[[Aqua-{Mu(4)-2,2 '-[(4,10-Dimethyl-1,4,7,10-Tetraazacyclododecane-1,7-Diyl)Bis(Methyliden E)] Bis(4-Oxo-4h-Pyran-3-Olato)}Perchloratocobaltbarium]Perchlorate]

The title compound, {[Ba{Co(H(-2)L1)}(ClO4)(H2O)]ClO4}(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)](ClO4)(H2O)}(+) cationic fragment and a non-coordinating ClO4- anion. In the neutral [Co(H(-2)L1)] moiety, the cobalt ion is hexacoordinated in a trigonal-prismatic fashion by the surrounding N4O2 donor set. The Ba2+ ion is nine-coordinated and exhibits a distorted [BaO9] 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- mu(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 ClO4- anions are located in the space between the chains. Weak C-H center dot center dot center dot 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 N4O2 donor set.