A series of 3D isomorphous lanthanide coordination polymers based on flexible dicarboxylate ligand: Synthesis, structure, characterization, and properties

Seven lanthanide coordination polymers, namely, {[Ln(BDOA)15(H2O)].H2O}(n) (Ln = Ce(I), Fr(II), Nd(III), Sm(IV), Eu(V), Gd(VI), and Tb(VII), H(2)BDOA = benzene-1,4-dioxydiacetic acid), have been synthesized through hydrothermal reactions of lanthanide nitrate with H2BDOA ligands and characterized by elemental analysis, infrared spectroscopy and single crystal X-ray diffraction. Findings indicate that I-VI are isomorphous and isostructural, containing the subunit of cavate 10-membered cages (Ln(2)O(2)(OCO)(2)), while VII possesses the subunit of cavate 14-membered cages (Tb-2(OCO)(4)), based on which to assemble into three-dimensional porous architectures via BDOA(2-) ligands, hydrogen bonds and interactions. I and III present antiferromagnetic behaviors and lanthanide contraction effect exists in Luminescent studies suggest the typical intense emissions of Ln(III) ions occur in the visible region and therefore the coordination polymers display good selectivity towards some certain metal ions such as Ca2+ and Cd2+, showing promising potential as selective luminescent probes of these metal ions. (c) 2014 Elsevier Ltd. All rights reserved.