Abstract
The reaction of CoCl2 with succinic acid and isonicotinamide in basic solution produces the title complex [Co(C6H6N2O)2(H2O)4](C4H4O4). The cobalt(II) ion of the complex cation and the succinate anion are each located on an inversion centre. The CoII ion is octa-hedrally coordinated by four O atoms of water mol-ecules and two N atoms of isonicotinamide mol-ecules. The two ions are linked via Owater-H⋯Osuccinate hydrogen bonds, forming chains propagating along [001]. In the crystal, these hydrogen-bonded chains are linked into a three-dimensional framework by further O-H⋯O hydrogen bonds and N-H⋯O hydrogen bonds. The framework is reinforced by C-H⋯O hydrogen bonds. Hirshfeld surface analysis and two-dimensional fingerprint plots have been used to analyse the inter-molecular inter-actions present in the crystal.
Highlights
Metal carboxylates have attracted intense attention because of their interesting framework topologies
The values of the Co—Owater and Co— Npyridine bond lengths and the bond angles involving atom Co1 (Table 1) are close to those reported for similar cobalt(II) complexes (Gao et al, 2006; Liu et al, 2012)
Each O atom of the succinate dianion is linked to an H atom of a water molecule via O—HÁ Á ÁO hydrogen bonds, so forming chains along the c-axis direction (Table 2 and Figs. 1 and 2)
Summary
Metal carboxylates have attracted intense attention because of their interesting framework topologies. Succinate dianions (succ) have good conformational freedom and they possess some desirable features such as being a versatile ligand because of the four electron-donor oxygen atoms they carry, and their ability to link inorganic moieties. Metal succinates are one of the best dicarboxylatebased moieties that display an interesting structural variety. Dicarboxylic acids such as succinic acid and amides have been useful in creating many supramolecular structures between isonicotinamide and a variety of carboxylic acid molecules (Vishweshwar et al, 2003; Aakeroy et al, 2002). Dicarboxylic acid ligands have been utilized frequently in the synthesis of various metal carboxylates. For this reason they have been investigated widely, both experimentally and computationally. We describe the synthesis, structural features and Hirshfeld surface analysis of a new tetraaquabis(isonicotinamide-N1)cobalt(II) succinate complex
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