Coordination structure and intermolecular interactions in copper(II) acetate complexes with 1,10-phenanthroline and 2,2'-bipyridine

The crystal structures of two coordination compounds, (acetato-κO)(2,2'-bipyridine-κ²N,N')(1,10-phenanthroline-κ²N,N')copper(II) acetate hexahydrate, [Cu(C₂H₃O₂)(C₁₀H₈N₂)(C₁₂H₈N₂)](C₂H₃O₂)·6H₂O or [Cu(bipy)(phen)Ac]Ac·6H₂O, and (acetato-κO)bis(2,2'-bipyridine-κ²N,N')copper(II) acetate-acetic acid-water (1/1/3), [Cu(C₂H₃O₂)(C₁₀H₈N₂)₂](C₂H₃O₂)·C₂H₄O₂·3H₂O or [Cu(bipy)₂Ac]Ac·HAc·3H₂O, are reported and compared with the previously published structure of [Cu(phen)₂Ac]Ac·7H₂O (phen is 1,10-phenanthroline, bipy for 2,2'-bipyridine, ac is acetate and Hac is acetic acid). The geometry around the metal centre is pentacoordinated, but highly distorted in all three cases. The coordination number and the geometric distortion are both discussed in detail, and all complexes belong to the space group P-1. The analysis of the geometric parameters and the Hirshfeld surface properties d_norm and curvedness provide information about the metal-ligand interactions in these complexes and allow comparison with similar systems.