A new uranyl(VI) complex of rigid V-shaped carboxylate ligand: Synthesis, structure and properties

Reaction of uranium oxynitrate hexahydrate with 4, 4″-Dicarboxyl-(1,1′,3′,1″)-Terphenyl (H2L) by liquid diffusion method resulted in a complex {[UO2(L)(DMF)]·H2O}n. Single-crystal diffraction analysis shows that the uranyl ion is in a pentagonal bipyramid coordination environment. Five oxygen atoms of L2− ligands and DMF constructed the equatorial plane. Two oxygen atoms of uranyl occupy the two axial positions. The complex got the two-dimensional layered structure by π–π interactions. The thermal analysis verifies the component and the structure of the complex. The UV/vis measurement exhibits that the complex has strong absorption in the UV and visible region.