Synthesis and crystal structure of [CuL0.5(Ac)2]n=0.5nCHCl3 (L=2,5-bis(4-pyridyl)-1,3,4-oxadiazole)

A one-dimensional complex [CuL0.5(Ac)(2)](n).0.5nCHCl(3) (L being 2,5-bis(4-pyridyl)-1,3,4-oxadiazole) has been synthesized and structurally characterized by X-ray diffraction: Monoclinic, space group C2/c with a=27.217(3) Angstrom, b=13.0383(11) Angstrom, c=8.5671(9) Angstrom, beta=103.215(3)degrees, V=2959.6(5) Angstrom(3), Z=8. The crystal structure of the complex reveals that the familiar lantern-type structure that is characteristic of dimetal tetracarboxylates of Cu-II ions, and the binuclear units were bridged by the angular ligands to form a one-dimensional zigzag chain coordination polymer. Every metal center is present in a distorted square-pyramidal coordination environment, consisting of coordination with one N atom of the ligand in the axial position and four O atoms of CH3COO- anions in equatorial positions. The Cu-II...Cu-II distance is 2.6060(9) Angstrom. The title complex resides in the formation of a 3D network through pi-pi stacking interactions.