Synthesis and Characterization of a Series of Lanthanide Complexes Constructed from Orotic Acid

摘要: The solution reaction of orotic acid (2,6-dioxo-1,2,3,6-tetrahydropyrimidine-4-carboxylic acid, H3dtpc) and Ln(NO3)3·6H2O (Ln = La, Ce) or Ln2O3 Pr, Nd) yielded five complexes [{Ln(aH2dtpc)2(bH2dtpc)(H2O)4}·H2O]n La 1, Ce 3), [La(aH2dtpc)2(cH2dtpc)(H2O)6]·4H2O (2), [Ln(aH2dtpc)2(OH)(H2O)6]·(H3dtpc)2·7H2O Pr 4, Nd 5). Complexes 1 3 possess 1D chain structures, 2 is a mononuclear structure, 4 5 are that extended into infinite honeycomb structures through hydrogen bonding interactions. hydrothermal Nd, Eu, Gd, Er) produced polymeric [Ln(dHdtpc)(OH)(H2O)]n 6, 7, Eu 8, Gd 9, Er 10), which contain isostructural 3D frameworks with ladder-like chains formed by LnIII, µ3-OH bridge an orotate spacer. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)