Synthesis, crystal structure and Hirshfeld surface analysis of tetraaquabis(isonicotinamide-κN 1)cobalt(II) fumarate

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 molecules in a distorted N2O4 octahedral 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 supramolecular architectecture. Hirshfeld surface analyses (d norm surfaces and two-dimensional fingerprint plots) for the title compound are presented and discussed.