Ligand-directed assembly of distinct 1-D Cd^II coordination polymers with a bent dipyridyl derivative and two isophthalates bearing different 5-substituents

Abstract

Two 1-D CdII coordination polymers, {[Cd(4-abpt)(hip)(H2O)2](H2O)7/2} n (1) and {[Cd(4-Habpt)(sip)(H2O)](H2O)2} n (2) (4-abpt = 4-amino-3,5-bis(4-pyridyl)-1,2,4-triazole, H2hip = 5-hydroxyisophthalic acid, H3sip = 5-sulfoisophthalic acid), have been hydrothermally synthesized and structurally characterized. Complex 1 has a comb-like 1-D coordination chain, while 2 presents a 1-D dual-track motif. The structural modulation of the coordination polymers can be achieved by simply changing the 5-substituent of the isophthalate from a hydroxyl group to a sulfonate group. Further, supramolecular architectures with higher dimensionality are constructed via hydrogen bonding and/or aromatic π-stacking interactions. Both complexes have been characterized by IR, microanalysis, and powder X-ray diffraction techniques. In addition, the solid fluorescence properties of both complexes have also been investigated.