Preparation, structures, and photocatalytic properties of three new uranyl-organic assembly compounds

Three new uranyl-organic coordination polymers (UO2)(8)(NDC)(12)(4,4'-bipyH(2))(3)(4,4'-bipyH)(3) (1), (UO2)(3)O[Ag(2,2'-biPY)(2)](2)(NDC)(3) (2), and (UO2)(2)(NDC)(2)(2,2'-biPY)(2) (3), where NDC = 1,4-naphthalenedicarboxylate and bipy = bipyridine, have been prepared in hydrothermal conditions. Both 1 and 2 possess a 2D structure while 3 is composed of 1D zigzag chains. In 1 there are mononuclear pentagonal-bipyramidal U-O polyhedra and 1D channels filled with 4,4'-bipy molecules, whereas in 2 there are mononuclear hexagonal-bipyramidal U-O polyhedra and tetranuclear pentagonal-bipyramidal U-O clusters which form 2D channels with occluded [Ag(2,2'-biPY)(2)](+) counterions. In 3 both the NDC and the bipy ligands coordinate to uranyl centers, leading to hexagonal-bipyramidal polyhedra which are connected to form 1 D zigzag chains. Under UV or visible irradiation, 1 and 2 degrade rhodamine B with similar efficiency. The correlation between photocatalytic reaction rate and oxygen concentration for 1 and 2 has also been elucidated. Crystal data: 1, triclinic, space group P (1) over bar, a = 11.037(2) angstrom, b = 15.126(3) angstrom, c = 15.660(3) angstrom, alpha = 62.05(3)degrees, beta = 72.26(3)degrees, gamma =82.05(3)degrees, and Z = 2; 2, triclinic, space group P (1) over bar, a = 14.161(3) angstrom, b = 15.122(3) angstrom, c= 18.212(4) angstrom, alpha = 85.73(3)degrees, beta = 76.99(3)degrees, gamma = 67.32(3)degrees, and Z = 2; 3, monoclinic, space group P2(1)/n, a = 10.7976(18) angstrom, b = 31.501(6) angstrom, c = 11.590(2) angstrom, beta = 97.609(4)degrees, and Z = 4.