Syntheses and photoluminescence properties of new Zn(II) and Cd(II) coordination polymers prepared from 5-sulfoisophthalate ligand

Abstract

New coordination polymers, formulated as {[Zn( µ -sipH)( µ -apim)] · 3H 2 O} n (1) andwere synthesized based on the 1-(3-aminopropyl)imidazole (apim) along with 5-sulfoisophthalate (sip) ligands. The complexes were synthesized under mild hydrothermal conditions. All the complexes were characterized by elemental analysis, FT-IR spectroscopy, and single-crystal X-ray diffraction studies. The X-ray crystallographic studies of 1 and 2 reveal Zn(II) and Cd(II) ions are µ -bridged by dianionic sipH and trianionic sip ligands in bis(monodentate) and bis(bidentate) coordination mode, respectively, to generate 1D polymer chains. In complex 1, the adjacent chains are linked by two apim ligands to form a 1D nanotubular structure. Complex 2 is the first example of a protonated apimH ligand. In the complexes the adjacent 1D chains extend into a 3D supramolecular network by hydrogen bonds.The thermal decomposition behavior and photoluminescent property of the complexes are also discussed herein.

Hydrothermal Synthesis, Crystal Structures and Properties of 1D Coordination Polymers Based on 5-Nitroisophthalic Acid and 1-Methylimidazole Linkers

“…It can connect to metal ions with four potential oxygen donor atoms from two carboxylate groups with the bending angle of 120 o and its 5-substituted nitro group has electron withdrawing ability and steric effect (11-14) (Scheme 1). Moreover, mixed-ligand coordination polymers (with dicarboxylic acid and N-donor neutral ligand) have been widely synthesized to improve the structural diversity and dimensionality in the assembly process (7,15). 1-methylimidazole ligand was used as a secondary neutral ligand to provide geometric need of metal centers.…”