Spectroscopic study of RE complexes with aliphatic dicarboxylate ligands
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2017
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INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th
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The metal carboxylate complexes possess a great variety of applications such as porosity, gas storage, catalyses, medical and optical markers. This work reports the synthesis and systematic spectroscopic study of a class of compounds with general formula [RE2(L)3·x(H2O)]y(H2O), where RE = Eu3+, Gd3+, Tb3+, “x” values varying from 2 to 6, “y” values varying from 0 to 4 and L is an aliphatic dicarboxylate containing from 2 up to 12 C atoms. The complexes [RE2(L)3·x(H2O)]y(H2O) were synthetized based on literature [1] with yield values around 90% by coprecipitation method. The complexes were characterized via elemental analysis (CHN), thermal analysis (TG), X-ray diffraction (XRD) infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The CHN, FTIR and TG indicate that the complexes are hydrated. The FTIR spectra indicate that the ligand-metal bonds are via chelate-bridging. The XRD patterns indicate high crystallinity and the systems are isomorphic to the same ligand. The emission spectra, represented by the azelate complexes of Eu3+ and Tb3+, present a highly intense red and green-color emission under UV excitation (254 nm), respectively to the Eu3+ and Tb3+ ions. Moreover, characteristic narrow emission bands arising from the 5D0→7FJ (J = 0-4) transitions of Eu3+, 5D4→7FJ (J = 6-0) transitions of Tb3+. The splitting of emission bands of Eu3+ complexes suggests high crystallinity and low symmetry around the metal ion, supporting the XRD data
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ASSUNCAO, I.P.; BRITO, H.F.; SILVA, I.G.N.; PEDROSO, C.C.S.; FELINTO, M.C.F.C.; MALTA, O.L. Spectroscopic study of RE complexes with aliphatic dicarboxylate ligands. In: INTERNATIONAL CONFERENCE ON LUMINESCENCE, 18th, August 27 - September 01, 2017, João Pessoa, PB. Abstract... p. 92-92. Disponível em: http://repositorio.ipen.br/handle/123456789/28674. Acesso em: 30 Dec 2025.
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