Crystal structures of two dimeric nickel di-phenyl-acetate com-plexes

Abstract

In the crystal structures of the title com-pounds, namely μ-aqua-κ² O:O-di-μ-di-phenyl-acetato-κ⁴ O:O'-bis-[(di-phenyl-acetato-κO)bis-(pyridine-κN)nickel(II)], [Ni₂(C₁₄H₁₁O₂)₄(C₅H₅N)₄(H₂O)] (1) and μ-aqua-κ² O:O-di-μ-di-phenyl-acetato-κ⁴ O:O'-bis-[(2,2'-bi-pyridine-κ² N,N')(di-phenyl-acetato-κO)nickel(II)]-aceto-nitrile-di-phenyl-acetic acid (1/2.5/1), [Ni₂(C₁₄H₁₁O₂)₄(C₁₀H₈N₂)₂(H₂O)]·2.5CH₃CN·C₁₄H₁₂O₂ (2), the com-plex units are stabilized by a variety of intra- and inter-molecular hydrogen bonds, as well as C-H⋯π and π-π contacts between the aromatic systems of the pyridine, dipyridyl and di-phenyl-acetate ligands. Despite the fact that the di-phenyl-acetate ligand is sterically bulky, this does not inter-fere with the formation of the described aqua-bridged dimeric core, even with a 2,2'-bi-pyridine ligand, which has a strong chelating effect.

Keywords: Hirshfeld surface analysis; NiII dimer; carboxyl­ate com­plex; crystal structure; hydrogen bonds; π-stacking.