resumo
Novel three-dimensional lanthanide-organic frameworks with 2,5-pyridinedicarboxylic (2,5-H(2)pdc) and 1,4-phenylenediacetic acids (1,4-H(2)pda) were synthesized by hydrothermal synthesis, and characterized structurally using single-crystal and powder X-ray diffraction, elemental and thermogravimetric analyses, FT-IR and photoluminescence spectroscopies, and diffuse reflectance. The structural details of [Ln(2)(2,5-pdc)(2)(1,4-pda)(H2O)(2)} [where Ln(3+) = Eu3+, Tb3+, (Eu0.2Tb0.8)(3+) and (Eu0.1Tb0.9)(3+)] and the dehydrated [Eu-2(2,5-pdc)(2)(1,4-pda)] phase were unveiled by single-crystal X-ray diffraction. Photoluminescence measurements performed for the Eu3+ and Tb3+ compounds show emission at room temperature. Energy transfer from Tb3+ to Eu3+ has been observed for the Eu3+/Tb3+ mixed materials.
palavras-chave
FULL-COLOR PHOSPHORS; COORDINATION POLYMERS; HYDROTHERMAL SYNTHESIS; MAGNETIC-PROPERTIES; STRUCTURAL-CHARACTERIZATION; 3-HYDROXYPICOLINIC ACID; LUMINESCENCE PROPERTIES; ADIPATE FRAMEWORK; TRIMESIC ACID; METAL-IONS
categoria
Chemistry; Crystallography; Materials Science
autores
Soares-Santos, PCR; Cunha-Silva, L; Paz, FAA; Ferreira, RAS; Rocha, J; Trindade, T; Carlos, LD; Nogueira, HIS
nossos autores
Filipe Alexandre Almeida Paz
Investigador Principal
Helena Isabel Seguro Nogueira
Professor Auxiliar com Agregação
João Rocha
Prof. Catedrático
Luís Carlos
Professor Catedrático
Maria Rute de Amorim e Sá Ferreira André
Professor Catedrático
Paula Cristina Ramos Soares e Santos
Técnico de Laboratório