Crystal structure and Hirshfeld surface analysis of tetraaquabis(isonicotinamide-κN 1)nickel(II) fumarate

Abstract

The reaction of NiCl2 with fumaric acid and isonicotinamide in a basic solution produces the title complex, [Ni(C6H6N2O)2(H2O)4](C4H2O4). The nickel(II) ion of the complex cation and the fumarate anion are each located on an inversion centre. The NiII ion is coordinated octahedrally by four water O atoms and two N atoms of isonicotinamide molecules. The fumarate anion is linked to neighbouring complex cations via Owater—H...Ofumarate hydrogen bonds. In the crystal, the complex cations are further linked by O—H...O, N—H...O and C—H...O hydrogen bonds, forming a three-dimensional supramolecular architecture. Hirshfeld surface analysis and two-dimensional fingerprint plots were used to analyse the intermolecular interactions present in the crystal and indicate that the most important contributions for the crystal packing are from H...O/O...H (41.8%), H...H (35.3%) and H...C/C...H (10.2%) interactions.