Abstract
The asymmetric unit of the title polymer, [Co2(C3H3O4)2Cl2(H2O)2] n , comprises one Co(II) atom, one water mol-ecule, one singly deprotonated malonic acid mol-ecule (HMal(-); systematic name 2-carb-oxy-acetate) and one Cl(-) anion. The Co(II) atom is octa-hedrally coordinated by the O atom of a water mol-ecule, by one terminally bound carboxyl-ate O atom of an HMal(-) anion and by two O atoms of a chelating HMal(-) anion, as well as by two Cl(-) anions. The Cl(-) anions bridge two Co(II) atoms, forming a centrosymmetric Co2Cl2 core. Each malonate ligand is involved in the formation of six-membered chelate rings involving one Co(II) atom of the dinuclear unit and at the same time is coordinating to another Co(II) atom of a neighbouring dinuclear unit in a bridging mode. The combination of chelating and bridging coordination modes leads to the formation of a two-dimensional coordination polymer extending parallel to (001). Within a layer, O-Hwater⋯Cl and O-Hwater⋯O hydrogen bonds are present. Adjacent layers are linked through O-H⋯O=C hydrogen bonds involving the carb-oxy-lic acid OH and carbonyl groups.
Highlights
CoII atom is octahedrally coordinated by the O atom of a water molecule, by one terminally bound carboxylate O atom of an hydrogenmalonate anion (HMal) anion and by two O atoms of a chelating HMal anion, as well as by two Cl anions
Each malonate ligand is involved in the formation of six-membered chelate rings involving one CoII
In the present communication we report on the structure of a two-dimensional coordination polymer, [Co(C3H3O4)Cl(H2O)]n, containing both chelating and bridging functions of singly deprotonated malonic acid ligands
Summary
Complexes with paramagnetic metal ions and extended structures are interesting due to their potential applications in molecular magnetism (Moroz et al, 2012; Pavlishchuk et al., 2010, 2011; Yuste et al, 2009). Malonic acid exhibits both chelating and bridging modes of coordination and is an efficient ligand for achieving two- or three-dimensional polymeric structures (Delgado et al, 2004). In the present communication we report on the structure of a two-dimensional coordination polymer, [Co(C3H3O4)Cl(H2O)]n, containing both chelating and bridging functions of singly deprotonated malonic acid ligands
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