title: Parallel stacking interactions in square-planar transition-metal complexes containing fused chelate and C6-aromatic rings.
abstract: Stacking interactions in the crystal structures of square-planar transition metal complexes from the Cambridge Structural Database with five- and six-membered chelate rings fused with C(6-arom) rings (arom = aromatic) were analyzed. The distribution of distances between the closest C(6-arom)-C(6-arom) and C(6-arom)-chelate contacts shows that in a large fraction of the intermolecular interactions the C(6-arom) ring of one molecule is closer to the chelate than to the C(6-arom) ring of the other molecule. These results indicate a possible preference of the C(6-arom) ring to form stacking contacts with the chelate rings. The preference is ubiquitous and does not depend on the metal type.
authors.affiliation: Innovation Centre, Department of Chemistry, University of Belgrade, Belgrade, Serbia.
authors.forename: Dušan N
authors.initials: DN
authors.lastname: Sredojević
authors.forename: Dubravka Z
authors.initials: DZ
authors.lastname: Vojislavljević
authors.forename: Zoran D
authors.initials: ZD
authors.lastname: Tomić
authors.forename: Snezana D
authors.initials: SD
authors.lastname: Zarić