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

Abstract

A one-dimensional complex [CuL0.5(Ac)2]n⋅0.5nCHCl3 (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) A, b = 13.0383(11) A, c = 8.5671(9) A, β = 103.215(3)°, V = 2959.6(5) A3, Z = 8. The crystal structure of the complex reveals that the familiar lantern-type structure that is characteristic of dimetal tetracarboxylates of CuII 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 CuII⋅⋅⋅CuII distance is 2.6060(9) A. The title complex resides in the formation of a 3D network through π–π stacking interactions.