Intermolecular Interactions between Chelate Rings and Phenyl Rings in Square‐Planar Copper( II ) Complexes

Analysis of the geometrical parameters in crystal structures of square‐planar copper(II) complexes from the CSD shows that the short noncovalent copper(II)−phenyl carbon distances are a consequence of the interaction between the phenyl ring and the chelate ring with delocalized π‐bonds. The data show a correlation between the distances between the centers of the chelate and phenyl rings and the copper(II)−carbon distances, as well as a mutual slipped‐parallel orientation of the phenyl and chelate rings. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)