Hydrothermal Synthesis and Crystal Structure of a Novel Lanthanide Coordination Polymer Bridged by Flexible Cyclohexane-1,2,3,4,5,6-hexacarboxylate and Rigid Oxalate Ligands

Reaction of Tb-2(ox)(3)center dot 6H(2)O and cyclohexane-1,2,3,4,5,6-hexacarboxylic acid hydrate (H6L1.H2O) (cis chair conformation L a,e,a,e,a,e) resulted in formation of a novel three-dimensional lanthanide coordination polymer [Tb-4(L-II)(ox)(3)(H2O)(8)] (trans-chair conformation L-II: e,e,e,e,e,e; ox: oxalate) under hydrothermal condition, which was characterized by elemental analysis and IR. X-ray diffraction crystal structure analysis shows that the complex crystallizes in triclinic system, space group P (1) over bar with a=0.60203(4) nm, b=1.082 78(8) nm, c=1.294 46(9) nm, alpha=67.908 0(10)degrees, beta=82.109 0(10), gamma=83.887 0(10)degrees, V=0.77307(9) nm(3), Z=2. In the formation of the complex, the cis-chair H6LI ligand transformed to the trans-chair L-II ligand, which adopts mu(8)-bridging mode connecting the Tb atoms to form two-dimensional (Tb-L-II) layers with channels. The one-dimensional (Tb-ox) chains bridged by mu(2)- and mu(4)-ox ligands link the (Tb-L-II) layers to generate a three-dimensional framework with channels, which were filled with ox ligands and water molecules through coordination and hydrogen interactions. CCDC: 790926.