Iridium
Mostrando 1-12 de 42 artigos, teses e dissertações.
-
1. RECENTES APLICAÇÕES DO ORGANOFOTOCATALISADOR 1,2,3,5-TETRAQUIS(CARBAZOL-9-IL)-4,6-DICIANOBENZENO EM TRANSFORMAÇÕES QUÍMICAS
Ruthenium and iridium polypyridine complexes are among the most employed photocatalysts described in literature. The broad applicability is due to the redox potentials and long half-life times of the excited state which these molecules presented. The pursuit for metal-free alternatives has been intensified in the last few years, therefore, many organic fluor
Quím. Nova. Publicado em: 2021-03
-
2. Shortcomings in the training program of medical residency during the COVID-19 pandemic in Brazil. How will they be repaired?
Ruthenium and iridium polypyridine complexes are among the most employed photocatalysts described in literature. The broad applicability is due to the redox potentials and long half-life times of the excited state which these molecules presented. The pursuit for metal-free alternatives has been intensified in the last few years, therefore, many organic fluor
Rev. Bras. Ginecol. Obstet.. Publicado em: 2021-03
-
3. Supramolecular Approach in Energy Conversion Devices
This review summarizes investigations carried out at the Laboratory of Photochemistry and Energy Conversion (LFCE) in the University of São Paulo dealing with design and characterization of ruthenium(II), rhenium(I) and iridium(III) polypyridine complexes with desired photochemical and photophysical properties in light of the development of optoelectronics
J. Braz. Chem. Soc.. Publicado em: 2020-11
-
4. INFLUÊNCIA DA COMPOSIÇÃO DOS NANOFIOS PT-IR/C NA ATIVIDADE CATALÍTICA FRENTE A OXIDAÇÃO ELETROQUÍMICA DE ETANOL EM MEIO ÁCIDO
Carbon-supported platinum-iridium nanowire-shape electrocatalysts containing 20% of metallic loading were synthesized by chemical reduction method using formic acid as a reducing agent and tested towards the oxidation of ethanol in acidic medium. The developed electrocatalysts were synthesized with the following compositions: Pt0.9Ir0.1/C, Pt0.8Ir0.2/C, Pt0.
Quím. Nova. Publicado em: 2020-02
-
5. Iridium-Based Catalysts for the Ethanol Electrooxidation in Acidic Media
Herein we sinthesize and investigate Ir-based nanocatalysts (dispersed in carbon) in different atomic compositions combining two (IrRh) and three metals (IrRhSn). These materials were evaluated towards the ethanol electrooxidation in acidic electrolyte in presence of three ethanol concentrations using cyclic voltammetry, while the species produced during the
J. Braz. Chem. Soc.. Publicado em: 21/10/2019
-
6. A importância do estado excitado 3MLCT de compostos de Ru(II), Re(I) e Ir(III) no desenvolvimento de fotossensores, oleds e fotorredução de CO2
The photochemistry and photophysics of coordination compounds have been extensively investigated not only because their structure, stability, reactivity dependence on the metal center oxidation state and the coordinated ligand; but also for their electronic transitions in a wide range of visible radiation. The knowledge of light absorption, excited state dea
Quím. Nova. Publicado em: 2017-02
-
7. Iridium Catalysts for C-C and C-O Hydrogenolysis: Catalytic Consequences of Iridium Sites
The support effect on the properties of iridium catalysts for C-C and C-O hydrogenolysis was investigated. Cyclohexane conversion and glycerol hydrogenolysis were used to compare the behavior of iridium catalysts in terms of C-C and C-O cleavage. The nature of the support influenced the catalyst performance in both cyclohexane conversion and glycerol hydroge
J. Braz. Chem. Soc.. Publicado em: 2016-05
-
8. Amperometric Detection of Isoprenaline Based on Glassy Carbon Electrode Modified by Iridium Oxide Nanoparticles
A simple and sensitive electrochemical sensor by using a glassy carbon electrode modified by iridium oxide nanoparticles (GCE/IrOxNPs) was constructed and utilized to determine isoprenaline (IP). This sensor was used successfully for IP determination in human urine samples. IrOxNPs are grown on a GCE by electrodepositing method. Various experimental paramete
J. Braz. Chem. Soc.. Publicado em: 2015-05
-
9. Iridium Oxidation States in Catalytic Hydrogenation Intermediates
Os conhecidos hidretos de irídio(III) [IrH2(NCMe)3(PiPr3)]BF4, [IrH(h3-C3H5)(NCMe)2(PiPr3)]BF4, [IrH(E-CH=CHPh)(NCMe)3(PiPr3)]BF4 e [IrH{C(Ph)=CH2}(NCMe)3(PiPr3)]BF4, derivados do precursor catalítico tipo Crabtree [Ir(cod)(NCMe)(PiPr3)]BF4, foram investigados em reações com substratos tipicamente envolvidos na catálise homogênea de hidrogenação. Nov
J. Braz. Chem. Soc.. Publicado em: 2014-12
-
10. Desenvolvimento de método para a determinação de irídio, paládio, platina e ródio por ICP OES em sílica mesoporosa para uso catalítico / Development of method for the determination of iridium, palladium, platinum and rhodium in mesoporosa silica for catalyst use by ICP OES
O objetivo deste estudo foi avaliar parâmetros tais como, moagem, tamanho de partículas, homogeneidade, segregação, dissolução de amostras e amostragem de suspensão, visando o desenvolvimento de método para a determinação de Ir, Pd, Pt e Rh por espectrometria de emissão óptica com plasma indutivamente acoplado (ICP OES) em sílica mesoporosa para
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 10/07/2012
-
11. Comparação dos tratamentos do carcinoma espinocelular avançado do esofago pela teleterapia exclusiva e pela teleterapia associada à braquiterapia
RACIONAL: O câncer do esôfago ainda constitui neoplasia de difícil tratamento e de prognóstico muito ruim. OBJETIVO: Comparar a resposta do tratamento exclusivo com teleterapia isolada versus teleterapia associada à braquiterapia endoluminal de doentes portadores de carcinoma espinocelular avançado do esôfago. MÉTODO: Foram estudados 49 doentes porta
ABCD. Arquivos Brasileiros de Cirurgia Digestiva (São Paulo). Publicado em: 2011-12
-
12. Estudo da adsorção do líquido iônico [BMIM]+[BF4]sobre γ-Al2O3 por cálculos ab initio
Ionic liquids are, by definition, salts formed by an organic cation and an inorganic anion, with a low melting point. An important application of ionic liquids is that they can replace conventional solvents. Recently, they were also used as cocatalysts (in the form of solvents) for metallic clusters, in the process of removal of aromatics from petroleum. The
Publicado em: 2010