Abstract
The reaction of cobalt(II) with fumaric acid (H2fum) and isonicotinamide in a basic solution produces the title salt, [Co(C6H6N2O)2(H2O)4](C4H2O4). In the complex cation, the CoII atom, located on an inversion centre, is coordinated by two isonicotinamide and four water mol-ecules in a distorted N2O4 octa-hedral geometry. The fumarate anion is located on another inversion centre and is linked to neighbouring complex cations via O-H⋯O and N-H⋯O hydrogen bonds and weak C-H⋯O hydrogen bonds. In the crystal, the complex cations are further linked by O-H⋯O, N-H⋯O and weak C-H⋯O hydrogen bonds, forming a three-dimensional supra-molecular architectecture. Hirshfeld surface analyses (dnorm surfaces and two-dimensional fingerprint plots) for the title compound are presented and discussed.
Highlights
The reaction of cobalt(II) with fumaric acid (H2fum) and isonicotinamide in a basic solution produces the title salt, [Co(C6H6N2O)2(H2O)4](C4H2O4)
The fumarate anion is located on another inversion centre and is linked to neighbouring complex cations via O—HÁ Á ÁO and N—HÁ Á ÁO hydrogen bonds and weak C—HÁ Á ÁO hydrogen bonds
The complex cations are further linked by O—HÁ Á ÁO, N—HÁ Á ÁO and weak C—HÁ Á ÁO hydrogen bonds, forming a three-dimensional supramolecular architectecture
Summary
Metal carboxylates have attracted intense attention because of their interesting framework topologies (Rao et al, 2004). Fumarate dianions (fum) have good conformational freedom and they possess some desirable features such as being versatile ligands because of the four electron-donor oxygen atoms they carry, and their ability to link inorganic moieties (Zheng et al, 2003). Dicarboxylic acids such as fumaric acid and amides have been useful in creating many supramolecular structures involving isonicotinamide and a variety of carboxylic acid molecules (Vishweshwar et al, 2003; Aakeroy et al, 2002). Dicarboxylic acid ligands are utilized in the synthesis of a wide variety of metal carboxylates. We describe the synthesis, structural features and Hirshfeld surface analysis of the title salt
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