Crystal Structure and Hirshfeld Surface Analysis of Tetraaquabis(Isonicotinamide-Κn1)Nickel(II) Fumarate

Abstract

The reaction of NiCl<inf>2</inf> with fumaric acid and isonicotinamide in a basic solution produces the title complex, [Ni(C<inf>6</inf>H<inf>6</inf>N<inf>2</inf>O)<inf>2</inf>(H<inf>2</inf>O)<inf>4</inf>](C<inf>4</inf>H<inf>2</inf>O<inf>4</inf>). 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 O<inf>water</inf> - H⋯O<inf>fumarate</inf> 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. © 2018 Kansiz et al.