2016. 57, 6 – UDC 548.73:547.13:546.562 CRYSTAL STRUCTURE AND SPECTROSCOPIC CHARACTERIZATION OF A COORDINATION POLYMER OF COPPER(II) CHLORIDE WITH ETHYLENEDIAMINE AND THE 2-HYDROXYBENZOATE ION S.S. Batool1, S.R. Gilani1, M.N. Tahir2, A. Siddique3, W.T.A. Harrison4 1Department of Chemistry, University of Engineering and Technology, Lahore, Pakistan E-mail: s_r_gilani@hotmail.com, syeda_shahzadi_uet@yahoo.com 2Department of Physics, University of Sargodha, Sargodha, Pakistan 3Department of Chemistry, Government Post Graduate Islamia College for Women, Lahore, Pakistan 4Department of Chemistry, University of Aberdeen, Aberdeen, Scotland Received April, 17, 2015 A new mixed-ligand one-dimensional copper(II) coordination polymer [Cu(en)(sal)Cl]n where en = ethylenediamine(C2H8N2) and Hsal = 2-hydroxybenzoic acid (salicylic acid; C7H6O3) is synthesized and characterized by FTIR spectroscopy and single crystal X-ray diffraction. <...> The structure contains Cu2+ ions in two different distorted octahedral coordination environments: an axially extended CuN4Cl2 moiety arising from a pair of bidentate en ligands and a CuO4Cl2 moiety arising from a pair of asymmetrically coordinated sal– anions. <...> The chloride ions bridge the copper ions into a zigzag chain propagating in [001]. <...> The structure is consolidated by N—H O and N—H Cl hydrogen bonds which generate a layered network. <...> Salicylic acid (Hsal) C7H6O3, also known as 2-hydroxybenzoic acid, has many biological properties including antipyretic, antiseptic, anti-bacterial, anti-fungal, keratolytic, and photoprotective activities and is used for skin treatments [ 2 ]. <...> The biological properties of copper and salicylic acid are manifested with an increased activity in copper(II) salicylate that is a potent antioxidant, anti-inflammatory, anti-arthritic, and anti-epileptic agent [ 3 ]. <...> Many ternary copper(II)—carboxylate complexes with diamines contain [Cu(en)2(X)2]2+ units where X = H2O or CH3OH. <...> The en ligands in the [Cu(en)2(X)2]2+ di-cation usually form an equatorial square plane, while the two trans water (or methanol) molecules occupy axial positions, forming a Jahn—Teller tetragonally distorted octahedron. <...> The carboxylate anions in these monomeric complexes usually take on the role of the counterion and intermolecular interactions, including O—H O <...>