2015. 56, 1 – UDC 548.73:547.13:546.65 CRYSTAL STRUCTURES AND CHARACTERIZATION OF TWO ONE-DIMENSIONAL COORDINATION POLYMERS CONTAINING Ln3+ IONS AND ANTHRANILATE (C7H6NO2)– ANIONS S. Hussain1, I.U. Khan1, W.T.A. Harrison2, M.N. Tahir3, S. Ahmad4 1Department of Chemistry, Government College University, Lahore, 54000, Pakistan E-mail: sajjaduet07@yahoo.com 2Department of Chemistry, University of Aberdeen, Aberdeen AB24 3UE, Scotland 3Department of Physics, University of Sargodha, Sargodha, Pakistan 4Department of Chemistry, University of Engineering and Technology, Lahore, Pakistan Received December, 21, 2013 The syntheses, crystal structures and characterization (IR, TGA/DSC) of the isostructural onedimensional coordination polymers [Ce(C7H6NO2)3]n (1) and [Pr(C7H6NO2)3]n (2) are described. <...> The metal ions adopt distorted capped square anti-prismatic MO9 coordination geometries. <...> The anthranilate ligands bridge the metal ions in bridging-bidentate (O, 2-O) mode to generate [010] chains in the crystal and each ligand features an intramolecular N—H O hydrogen bond. <...> It is notable that two very similar, but crystallographically distinct chains appear in the unit cell. <...> INTRODUCTION Anthranilic acid (Hanth or 2-aminobenzoic acid), C7H7NO2, has a minor structural claim to fame because it crystallizes with one neutral molecule and one zwitterionic molecule in the asymmetric unit [ 1 ]. <...> In its deprotonated, anionic, anth– form (see scheme below), it is an effective ligand for transition metal ions, which can bond in various different ways including O,O-bidentate [ 2 ], bridging-monodentate [ 3 ], O-monodentate [ 4 ] and N,O,O-bridging tridentate [ 5 ]. <...> A preliminary report described the crystal structure of a bimetallic europium-anth complex [ 6 ] and a comprehensive study . 133 – 140 Scheme 1. <...> The anth– anion in its (O,2-O) bridging-bidentate bonding mode © Hussain S., Khan I.U., Harrison W.T.A., Tahir M.N., Ahmad S., 2015 134 S. HUSSAIN, I.U. KHAN, W.T.A. HARRISON ET AL. by Deacon et al. [ 7 ] revealed La, Nd, Eu and Er complexes with a wide variety of structures. <...> As an extension of these studies, in this paper we describe the syntheses, characterization and single crystal structures of [Ce(C7H6NO2 <...>