Temperature-controlled formation of two Zn(II)-coordination polymers based on flexible o-phenylenediacetic acid and rigid 1,4-bis(imidazol-1-yl)benzene

Abstract

Two new coordination polymers with the same components, namely [Zn(mu-opda)(mu-dib)(0.5)(dib)](n) (1) and [Zn(mu(3)-opda)(mu-dib)(0.5)] (2), were synthesized under different temperatures and characterized by elemental analyses, IR spectroscopy, powder and single X-ray diffractions. The X-ray results showed that complex 1, synthesized at 120 degrees C, was a 1D ladder-like coordination polymer. When the reaction temperature was increased from 120 to 170 degrees C, a 2D coordination polymer (complex 2) was obtained with the sql topology. The o-pda ligand displayed different coordination modes in 1 and 2. Moreover, thermal, photoluminescence and topological properties of the synthesized complexes were studied in detail. (C) 2015 Elsevier Ltd. All rights reserved.