3 years ago

New lanthanide 2D coordination polymers constructed from a flexible ether-bridged tricarboxylate block: Synthesis, structures and luminescence sensing

New lanthanide 2D coordination polymers constructed from a flexible ether-bridged tricarboxylate block: Synthesis, structures and luminescence sensing
Three new 2D lanthanide-organic networks, {[Sm2(µ 4-cpta)(µ 5-cpta)(H2O)3]·3H2O} n (1) and [Ln(µ 3-cpta)(phen)(H2O)2] n (Ln=Tb (2) and Sm (3)), were successfully synthesized via hydrothermal reactions using Ln(NO3)3·6H2O, a flexible ether-bridged tricarboxylic acid H3cpta (2-(2-carboxyphenoxy)terephthalic acid) as a principal building block, and phen (1,10-phenanthroline) as an optional supporting ligand. All products were obtained as air and thermally stable microcrystalline solids and fully characterized by standard solid-state techniques, including elemental analysis, TGA, IR spectroscopy, powder and single-crystal X-ray diffraction. Compound 1 possesses an intricate 2D layer structure with the 4,5L51 topology, which is driven by the µ 4- and µ 5-cpta3− and Sm(III) nodes. Compounds 2 and 3 are isostructural and disclose a different 2D metal-organic network with the fes topology, which is assembled from the µ 3-cpta3− and Ln(III) nodes. Luminescence properties of 2 and derived M n +@2 suspensions were investigated, disclosing a possible use of this compound as a notable luminescence sensor for the detection of Fe3+ cations in aqueous medium.

Publisher URL: www.sciencedirect.com/science

DOI: S0020169317309283

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