Construction of a series of rare earth metal-organic frameworks supported by thiophenedicarboxylate linker: Synthesis, characterization, crystal structures and near-infrared/visible luminescence

• Autor(a) principal: Marques, Lippy F.
• Data de Publicação: 2016
• Outros Autores: Santos, Hudson P., Correa, Charlane C., Resende, Jackson A.L.C., da Silva, Robson R. [UNESP], Ribeiro, Sidney J.L. [UNESP], Machado, Flávia C.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1016/j.ica.2016.07.008; http://hdl.handle.net/11449/178134
• topic: 25-Thiophenedicarboxylic acid; Lanthanides; Metal-organic frameworks; Photoluminescence

Six novel rare earth metal organic-frameworks with the general formula {[RE2(2,5-tdc)3(dmso)2]·H2O}n(RE = YIII, PrIII, NdIII, SmIII, ErIIIand TmIII; 2,5-tdc2− = 2,5-thiophenedicarboxylate anion; dmso = dimethylsulfoxide) were synthesized and their complete characterization, including single crystal X-ray diffraction, FTIR spectroscopy and thermal analysis (TG/DTA) are reported. Structure analysis reveals that REIIIions show distorted capped trigonal – prismatic geometry. The 2,5-tdc2−ligands connect four REIIIcenters, adopting (κ1– κ1) – (κ1– κ1) – μ4coordination mode, generating an interesting 3D network with potential application for gas adsorption. Photophysical properties were studied using excitation/emission spectra and the photoluminescence data show the near infrared (NIR) and visible (Vis) emission with the characteristic transitions:1D2 → 3F2for PrIII,4F3/2 → 4IJ(J = 9/2, 11/2 and 13/2) for NdIII,4G5/2 → 6HJ(J = 5/2, 7/2, 9/2 and 11/2) for SmIIIand4I13/2 → 4I15/2for ErIII. This study indicates that 2,5-tdc2−ligand is able to act as a sensitizer for emission in NIR and Vis region in these ions.