Date Published: April 01, 2011
Publisher: International Union of Crystallography
Author(s): Hadi Kargar, Reza Kia.
The asymmetric unit of the title coordination polymer, [Cu(C18H16Cl2N2O2)]n, consists of a Schiff base complex in which the CuII atom adopts a square-pyramidal coordination geometry, being coordinated by two N and two O atoms of symmetry-related ligands and by a third O atom from a complex related by an inversion center. In the structure, a crystallographic twofold rotation axis bisects the central C—C bonds of the n-butyl spacers of the designated Schiff base ligands, making symmetry-related dimeric units, which are twisted around CuII atoms in a bis-bidentate coordination mode. In the crystal, these dimeric units are connected through the third bridging Cu—O bonds [2.3951 (13) Å], forming one-dimensional coordination polymers, which propagate along . Furthermore, intermolecular π–π interactions [centroid–centroid distance = 3.811 (1) Å] stabilize the crystal packing.
For van der Waals radii, see: Bondi (1964 ▶). For background to coordination polymers, see: Kido & Okamoto (2002 ▶); Li et al. (2006 ▶); Eddaoudi et al. (2001 ▶); Dietzel et al. (2005 ▶). For background to bis-bidentate Schiff base complexes, see: Hannon et al. (1999 ▶); Lavalette et al. (2003 ▶). For the synthesis and structural variations of Schiff base complexes, see: Granovski et al. (1993 ▶); Elmali et al. (2000 ▶).