Synthesis, crystal structure and properties of a 1-D Cd(II) coordination polymer [Cd(p-BDOA)·2H2O]n constructed by flexible carboxylic acid

A novel 1-D Cd(II) coordination polymer, [Cd(p-BDOA)·2H 2O]n (I) (p-BDOA2-=benzene-1,4-dioxyacetate dianion) has been synthesized and characterized by elemental analysis, IR, PL, TG and X-ray single crystal diffraction. The Crystal crystallizes in monoclinic system, the space group is C2/c, with the crystal cell parameters a=1.1751(1) nm, b=0.5510(1) nm, c=1.8277(2) nm, β=96.14(2)°, and V=1.176 6(3) nm3, Mr=372.60, R =0.045 9, wR=0.1279. The Cd(II) ion has a trigonal prism coordination configuration that defined by four carboxyl O atoms from two different p-BDOA2- ligands and two water molecules. Adjacent Cd(II) ions are linked by carboxylate groups with the bidentate coordination mode, giving rise to a chain structure with the adjacent Cd⋯Cd distance of 1.5263(5) nm. Furthermore, such chains are linked by hydrogen bonds to form supramolecular network. The results of PL and TG show that the complex exhibits intense fluorescent emissions and its chain skeleton is thermally stable up to 419 K. CCDC: 220443.