Two novel isostructural Ln (III) 3D frameworks supported by 3,6-dibromobenzene-1,2,4,5-tetracarboxylic acid and in situ generated oxalate: Syntheses, characterization and photoluminescent property

Two isostructural lanthanide complexes, [Ln (dbtec)(0.5)(ox)(0.5)center dot 3H(2)O](n), [Ln = Dy (1), Yb (2)] (H(4)dbtec = 3,6-dibromobenzene-1.2,4,5-tetracarboxylic acid; H(2)ox = oxalic acid), have been synthesized under the hydrothermal method and characterized by single-crystal X-ray diffraction, X-ray powder diffraction (PXRD), thermogravimetric analysis (TGA) and elemental analysis (EA) and IR spectra. Complex 1 and 2 present a 2-nodal (4,6)-connected 3D fsc network. The C-13 NMR of H(4)dbtec indicates ox in 1 and 2 is generated by the in situ decomposition of Kidbtec. Additionally, the photoluminescent properties of 1 and 2 are also discussed. (C) 2012 Elsevier B.V. All rights reserved.