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Photoluminescent Investigation of the Doping Site of Eu3+-Doped [Zn3(BTC)2·12H2O] Metal-Organic Framework Prepared by Microwave-Assisted Hydrothermal Synthesis

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Autor(es):
César S. Cunha ; Oscar L. Malta ; Huayna Terraschke ; Hermi F. Brito
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: Journal of the Brazilian Chemical Society; v. 31, n. 11, p. 2409-2420, Nov. 2020.
Citações Web of Science: 0
Resumo

The [Zn3(BTC)2·12H2O] (BTC = 1,3,5-tricarboxylate) metal-organic framework (MOF) was successfully synthesized using a microwave-assisted hydrothermal synthesis technique, which allowed for significantly decreased reaction time compared to the production of the same compound via conventional heating. In situ doping with Eu3+ ions at concentrations ranging from 1.0 to 5.0 mol% produced doped materials whose emission ranged from blue to red color. The Eu3+ spectroscopic properties were used to study the incorporation of the dopant into the structure of [Zn3(BTC)2·12H2O], even at very low concentrations. These experiments confirmed the usefulness of this ion as a luminescent probe, as it permitted the identification of small variations in structure not perceptible by X-ray diffraction. The variation in the coordination environment induced by increases in doping percentage was analyzed by evaluating changes in the characteristic Eu3+ excitation and emission profiles, using them to calculate luminescence lifetimes, experimental intensity parameters Ωλ (λ: 2 and 4) as well as the intrinsic quantum yield (QEu+3Eu+3) of the 5D0 emitting level of each doped MOF. The excitation and luminescence spectra show that intramolecular energy transfer from the BTC linker to Eu3+ ion, and we could observe the emission color tuning originated from the emissions of the BTC ligand and Eu3+ ion. (AU)

Processo FAPESP: 13/07521-6 - Preparação de sistemas supramoleculares - MOF contendo íons terras raras e investigação de suas propriedades fotoluminescentes
Beneficiário:Cesar dos Santos Cunha
Linha de fomento: Bolsas no Brasil - Doutorado Direto
Processo FAPESP: 16/03640-9 - Investigação de alto rendimento de novas estruturas metal-orgânicas (MOFs) à base de bismuto dopado com terras raras
Beneficiário:Cesar dos Santos Cunha
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado Direto