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)0.5·3H2O]n, [Ln = Dy (1), Yb (2)] (H4dbtec = 3,6-dibromobenzene-1,2,4,5-tetracarboxylic acid; H2ox = 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 13C NMR of H4dbtec indicates ox in 1 and 2 is generated by the in situ decomposition of H4dbtec. Additionally, the photoluminescent properties of 1 and 2 are also discussed.

Graphical abstractTwo isostructural lanthanide complexes, [Ln (dbtec)0.5(ox)0.5·3H2O]n, [Ln = Dy (1), Yb (2)] (H4dbtec = 3,6-dibromobenzene-1,2,4,5-tetracarboxylic acid; H2ox = oxalic acid), have been synthesized under the hydrothermal method and characterized. In 1 and 2 oxalic acid (in situ reaction generated) plays an important role in determining the 3D frameworks. The thermal stability and luminescent behavior of 1 and 2 were also discussed.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Two novel 3D Ln(III) coordination polymers were synthesized and characterized. ► In situ oxalic acid generated during the hydrothermal reaction of H4dbtec. ► The photoluminescent properties of 1 and 2 are also discussed.