A novel near monochromatic red emissive europium(III) metal-organic framework based on 1,2,4,5-benzenetetracarboxylate: From synthesis to photoluminescence studies
authors Lahoud, MG; Frem, RCG; Marques, LF; Arroyos, G; Brandao, P; Ferreira, RAS; Carlos, LD
nationality International
journal JOURNAL OF SOLID STATE CHEMISTRY
author keywords Photoluminescence; Metal-organic frameworks; Europium; Tetracarboxylate
keywords RARE-EARTH IONS; COORDINATION POLYMERS; LUMINESCENT PROPERTIES; LANTHANIDE COMPLEXES; MAGNETIC-PROPERTIES; CRYSTAL-STRUCTURES; ACID; LIGAND; EU3+; INTENSITIES
abstract This work presents the synthesis, solid state characterization (infrared spectroscopy, thermal analysis (TGA/DTA), powder and single crystal X-ray diffraction) and photoluminescence studies of a new europium metal organic framework (MOF), [Eu-2(Btec)(1,5)(H2O)](n) (Btec(4-) =1,2,4,5-benzenetetracarboxylate anion). Single crystal X-ray diffraction analysis reveals that the material has a three-dimensional network, with two crystallographically independent Eu(III) ions adopting different coordination geometries. This structure presents one of the Btec(4-) anions acting as a mu(8)-bridging linker, with the carboxylate groups in distinct connection to Eu(III) ions, culminating into an unknown coordination mode for the linker. The results of thermogravimetric analyses indicate that the MOF has high thermal stability, with this characteristic being of great interest for the application of these compounds in several fields such as catalysis and photonics. The luminescent properties showed that the Eu(III) ions are a local-spectroscopic probe, with the compound presenting a red emission when excited in the UV spectral region with absolute emission quantum yield values of 0.48 +/- 0.05. The thermal dependence on the intensity of the transitions originating from the F-7(1) level, especially the F-7(1) -> D-5(1) transition, was studied. These results opens the possibility to test this MOF [Eu-2(Btec)(1.5)(H2O)(7) in the field of molecular thermometry.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0022-4596
isbn 1095-726X
year published 2017
volume 253
beginning page 176
ending page 183
digital object identifier (doi) 10.1016/j.jssc.2017.05.041
web of science category Chemistry, Inorganic & Nuclear; Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000406572600024
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journal impact factor 2.179
5 year journal impact factor 2.130
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