Synthesis, structures, luminescent and magnetic properties of four coordination polymers with the flexible 1,3-phenylenediacetate ligands

Four coordination polymers, [Zn(pda)(bPY)(H2O)](n)center dot H2O (1), [Cd(pda)(prz)(H2O)](n) (2). [Co-3(mu(3)-OH)(2)(Pda)(2)(PYz)](n)center dot 2nH(2)O (3) and [Pr-2(pda)(3)(H2O)](n) (4) (H(2)pda=1,3-phenylendiacetic acid, bpy=4,4'-bipyridine, prz= piperazine and pyz=pyrazine) have been hydrothermally synthesized and characterized. Complex 1 is a ID wheel-like chain structure, which is further extended into a 3D metal-organic supramolecular framework by H-bonds and pi-pi stacking interactions. Complex 2 is a 1 D ladder-like chain structure, which is also further extended into a 3D metal-organic supramolecular framework by H-bonds. Complex 3 possess a 2D sheet structure with infrequent two pairs of double-helix chains. Complex 4 features a 3D structure. Both 1 and 2 display strong blue fluorescent emission at room temperature. Magnetic susceptibility measurements of complexes 3 and 4 exhibit antiferromagnetic interactions between the nearest metal ions, with C=9.99 and 3.43 cm(3) mol(-1) K, and theta=-23.9 and -46.3 K, respectively. Crown Copyright (C) 2011 Published by Elsevier Inc. All rights reserved.