Abstract
The title compound, {[Ba{Co(H-2L1)}(ClO4)(H2O)]ClO4} n , L1 = 4,10-bis-[(3-hy-droxy-4-pyron-2-yl)meth-yl]-1,7-dimethyl-1,4,7,10-tetra-aza-cyclo-dodeca-ne, is a one-dimensional coordination polymer. The asymmetric unit consists of a {Ba[Co(H-2L1)](ClO4)(H2O)}+ cationic fragment and a non-coordinating ClO4- anion. In the neutral [Co(H-2L1)] moiety, the cobalt ion is hexa-coordinated in a trigonal-prismatic fashion by the surrounding N4O2 donor set. The Ba2+ ion is nine-coordinated and exhibits a distorted [BaO9] monocapped square-anti-prismatic geometry, the six oxygen atoms coming from three distinct [Co(H-2L1)] moieties, while the remaining three vertices are occupied by the oxygen atoms of a bidentate perchlorate anion and a water mol-ecule. A barium-μ2-oxygen motif develops along the a axis, connecting symmetry-related dinuclear BaII-CoII 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⋯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 BaII-based one-dimensional coordination polymer, containing CoII ions surrounded by a N4O2 donor set.
Highlights
In the neutral [Co(H–2L1)] moiety, the cobalt ion is hexacoordinated in a trigonal–prismatic fashion by the surrounding N4O2 donor set
[Co(H–2L1)] moieties, while the remaining three vertices are occupied by the oxygen atoms of a bidentate perchlorate anion and a water molecule
Weak C—H O hydrogen bonds involving both coordinating and non-coordinating perchlorate anions build the whole crystal architecture. This is the first example of a macrocyclic ligand forming a BaII-based one-dimensional coordination polymer, containing CoII ions surrounded by a N4O2 donor set
Summary
Metal coordination polymers (CPs) have witnessed continuous growth, owing to their fascinating structural diversity in terms of architecture and topology and their numerous potential applications, such as gas storage (Banerjee et al., 2016; Fracaroli et al, 2014; Sumida et al, 2012; Suh et al, 2012), chemical sensing (Campbell et al, 2015; Hu et al, 2014; Wang et al, 2013; Kreno et al, 2012), catalysis (Chughtai et al, 2015; Mo et al, 2014; Yoon et al, 2012; Liu, Xuan et al, 2010) and so forth. It has already proved to able form a CoII species (Borgogelli et al, 2013) that is able to bind hard metal ions such as LnIII (Ln = Gd, Eu) and Na(I). In the case of the alkaline ion, a heterodinuclear complex forms, involving only one CoII species (Borgogelli et al, 2013). We present a BaII–CoII heterodinuclear metal coordination compound of L1, where a one-dimensional wave-like infinite array of barium ions bridges the [Co(H–2L1)] moieties through a barium–2-oxygen motif. This is the first time that L1 has proven able to form a coordination polymer and, to our knowledge, this is the first example of a macrocyclic ligand forming a BaII-based 1D-CP containing.
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