Lanthanide Ion
Mostrando 1-12 de 37 artigos, teses e dissertações.
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1. MÉTODO MANUAL PARA DEPOSIÇÃO DE TINTAS FOTOLUMINESCENTES BASEADAS EM LOFS MISTAS APLICADO A CODIFICAÇÃO DE DOCUMENTOS
In this work, the process of synthesis of Metal-Organic Frameworks containing lanthanide ions (LOFs), accelerated via a precipitating agent, capable of accelerating the process of nucleation of MOF crystals, in order to explore the optical properties of this precursor solution (SP_Gd/EU-MOF), as a quick-response photoluminescent material in the coding of off
Quím. Nova. Publicado em: 2020-12
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2. ÓXIDO DE ÍTRIO E ALUMÍNIO DOPADO COM Yb3+ E Er3+ INCORPORADO EM MEMBRANA DE POLIAMIDA
Lanthanide ions have special light emission, which can occur through descending and ascending energy conversion. Ascending energy conversion is especially interesting for bioapplications because excitation in the infrared region does not excite biomolecules and therefore does not interfere in detection, not to mention that it penetrates deeper in the skin. H
Quím. Nova. Publicado em: 2018-05
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3. CONTRIBUIÇÃO AO ESTUDO DE CAMPO CRISTALINO E TRANSIÇÕES 4f-4f EM SISTEMAS CONTENDO LANTANÍDEOS. / CONTRIBUTION TO THE STUDY OF CRYSTAL AND FIELD 4F-4F TRANSITIONS IN SYSTEMS CONTAINING LANTHANIDES.
A theoretical study of the interactions between the 4f electrons in lanthanide ions (Ln3 +) with the chemical environment was made using crystal field theory. The main effects were studied: change in position of the berycentre of the energy levels of the free ion, maximum splitting of the J level and contribution to 5D0-7F0 transition of Eu3+ ion. Use of sec
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/09/2012
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4. Synthesi and photoluminescent properties of bis-diketonate complexes of trivalent lanthanide ions with phosphine oxide ligands / Síntese e propriedades fotoluminescentes de complexos bis-dicetonatos de íons lantanídeos trivalentes com ligantes fosfinóxidos
Este trabalho relata a síntese, caracterização e a investigação das propriedades fotoluminescentes de complexos β-dicetonatos (TTA=2-tenoiltrifluoroacetonato e DBM= dibenzoilmetanato) de íons lantanídeos trivalentes (Ln3+= Gd3+, Eu3+ e Tb3+) com diferentes ligantes fosfinóxidos (TPPO= trifenilfosfinóxido e HMPA= hexametilfosforamida). Os dados
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/06/2011
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5. Estudos das propriedades ópticas dos complexos európio tetraciclinas e suas aplicações na detecção de lipoproteínas / Studies of optical properties of complexes europium tetracycline and its applications in detection of lipoproteins
This work presents the optical properties of europium complexes - Tetracyclines (EuTcs) in the presence of LDL and oxidized LDL with potential applications in clinical analysis. Four elements were chosen from the Tetracyclines family: Tetracycline (Tc), Chlortetracycline (CTc), Metatetraciclina (MTc) and Oxytetracycline (OTc) to be part of complexes with eur
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 26/07/2010
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6. DESENVOLVIMENTO DE UM NOVO MARCADOR LUMINESCENTE PARAMICROCISTINA-LR: um estudo teórico. / DEVELOPMENT OF A NEW luminescent PARAMICROCISTINA-LR: a theoretical study.
In this work we describe a theoretical study of lanthanide complexes with macrocyclic ligands. Spectroscopic properties of the cryptate [EuÌ(bipy)2py(CO2Et)2]3+.2H2O were investigated with semiempirical methodologies such as Sparkle, INDO/S-CIS, Judd- Ofelt model as well as Maltas models implemented in LUMPAC (Luminescence Package). This computational packa
Publicado em: 2010
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7. AvaliaÃÃo espectroscÃpica da substituiÃÃo sistemÃtica de molÃculas de Ãgua coordenadas por ligantes β-dicetonas em complexos com Ãons lantanÃdeos
In this work, lanthanide complexes with β-diketones (2,4-pentanedione and trifluoroacetylacetone) and β-keto esters (etil 4,4,4,-trifluoro-2,4- pentanedione) ligands have been synthesized. The complexes showed general formulas: [Ln(acac)(H2O)6]Cl2, [Ln(acac)2(H2O)4]Cl, [Ln(tfa)(H2O)6]Cl2, [Ln(tfa)2(H2O)4]Cl e [Ln(eta)2(H2O)4]Cl. The compounds were
Publicado em: 2008
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8. Redes de coordenaÃÃo com Ãons lantanÃdeos: sÃntese, caracterizaÃÃo e estudo espectroscÃpio
This work shows the synthesis of new metalorganic frameworks containing Eu3+ and Gd3+ ions, using 1,3,5,-benzenetrisbenzoic acid (H3BTB) as ligand. The H3BTB was synthesized in two steps and characterized by elemental analysis, infrared spectroscopy and nuclear magnetic resonance 1H and 13C; the obtained results confirm all literature dataâs. Networks of co
Publicado em: 2008
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9. Synthesis and characterization of Eu3+ and Er3+ doped SiO2-ZrO2 based transparent glass ceramic nanocomposites via sol-gel process / Síntese e caracterização de nanocompósitos vitrocerâmicos transparentes a base de SiO2-ZrO2 dopados com íons Eu3+ e Er3+ via processo sol-gel
The preparation of transparent glass-ceramic based on the SiO2-ZrO2 doped with Eu3+ and Er3+ ions by the sol-gel methodology was the aim of this work. The structural and optical properties of the systems as a function of the time and temperature of annealing and also zirconium concentration are presented. The sol was prepared in acid solution and left in res
Publicado em: 2008
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10. Ãteres coroa com Ãons lantanÃdeos: de compostos de coordenaÃÃo a novos materiais nanoestruturados de sÃlica
Com o objetivo de desenvolver novos materiais e ligantes, baseados em Ãteres coroa, capazes de coordenarem um ou mais Ãons lantanÃdeos, o presente trabalho mostra a sÃntese de compostos de coordenaÃÃo mono e binucleares, livres ou ligados Ãs matrizes de sÃlica. As caracterizaÃÃes foram realizadas via anÃlise elementar, anÃlise termogravimÃtrica,
Publicado em: 2008
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11. Modelo Sparkle: novos avanÃos para o estudo quÃmico-quÃntico de complexos de lantanÃdeos
Since 1994, the Sparkle Model for Lanthanide Complexes has been used for the calculation of ground state geometries of only Eu(III) complexes. In the present thesis, we evolved the Sparkle Model and advanced Sparkle/AM1 and Sparkle/PM3: new paradigms for semiempirical quantum chemical calculations on lanthanide complexes. Parameterizations for all fifteen tr
Publicado em: 2007
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12. Estudo do comportamento térmico e da luminescência de filmes de quitosana com os íons Eu3+ e Tb3+
Films of chitosan with trivalent lanthanides ions Eu3+ and Tb3+ were respectively prepared in the ratio of 3:1 m/m (chitosan: lanthanide) and 6:1 m/m (chitosan: lanthanide). There were no formations of films in a ratio of 1:1 m/m (chitosan: lanthanides). The films of chitosan with the Tb3+ ion have the same transparent appearance than the pure chitosan films
Publicado em: 2007