Tellurium
Mostrando 1-12 de 60 artigos, teses e dissertações.
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1. Seleno- and Telluro-Functionalization of Quinones: Molecules with Relevant Biological Application
Quinones and organochalcogens are classes of compounds with great biological applicability, such as antioxidant, anticancer, anti-Alzheimer, and antidepressant activities, among others. Thus, the combination of these two classes of compounds is important to obtain new hits with biological activities that are additive or synergistic. Several methodologies for
Journal of the Brazilian Chemical Society. Publicado em: 2022
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2. Complementary Performance of Organoselenides and Organotellurides as Antimicrobials Agents
Fungi and bacteria are well-known pathogens for plants, fruits, and animals, including humans. In this context, the prospection of antimicrobial agents is crucial to provide new alternatives for the treatment of microbial diseases. Hence, selenium- and tellurium-containing compounds are underexploited and herein, antimicrobial activity of several organochalc
J. Braz. Chem. Soc.. Publicado em: 2021-03
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3. THE SYMMETRY BREAKING PHENOMENON IN 1,2,3-TRIOXOLENE AND C2Y3Z2 (Z= O, S, Se, Te, Z= H, F) COMPOUNDS: A PSEUDO JAHN-TELLER ORIGIN STUDY
1,2,3-Trioxolene (C2O3H2) is an intermediate in the acetylene ozonolysis reaction which is called primary ozonide intermediate. The symmetry breaking phenomenon were studied in C2O3H2 and six its derivatives then oxygen atoms of the molecule are substituted by sulphur, selenium, tellurium (C2Y3H2) and hydrogen ligands are replaced with fluorine atoms (C2Y3F2
Quím. Nova. Publicado em: 2017-06
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4. Facile Synthesis of Tellurium Nanowires and Study of Their Third-Order Nonlinear Optical Properties
We report on the synthesis of single-crystalline tellurium nanowires with different aspect-ratios prepared via facile surfactant-assisted synthesis under mild conditions. Short and long Te nanowires were synthesized by the reduction of tellurium dioxide by hypophosphorous acid with the assistance of polyoxyethylene (23) laurylether and cetyltrimethylammonium
J. Braz. Chem. Soc.. Publicado em: 2017-01
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5. Effects of Te additions and stirring in the In segregation in Ga1-xInxSb alloys
Abstract The influence of tellurium in the indium segregation of Ga1-xInxSb:Te ingots obtained by the conventional vertical Bridgman method (CVBM), under stirred and non-stirred conditions, was investigated. Three Te-doped ingots and three no-doped ingots were unidirectionally solidified at a constant speed of 2.0 mm/hour, inside quartz ampoules, closed unde
REM, Int. Eng. J.. Publicado em: 2016-12
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6. Selective Synthesis of (Z)-Chalcogenoenynes and (Z,Z)-1,4-bis-Chalcogenbuta-1,3-dienes Using PEG-400
We present here our results on the temperature controlled, selective hydrochalcogenation of 1,4-diorganyl-1,3-butadiynes with nucleophilic species of selenium, tellurium and sulfur generated in situ from the respective diaryl dichalcogenide and NaBH4. Using polyethylene glycol (PEG)-400 at 30 ºC the (Z)-chalcogenoenynes are obtained and at 90 ºC the (Z,Z)-
J. Braz. Chem. Soc.. Publicado em: 2016-11
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7. Solventless and Mild Procedure to Prepare Organotellurium(IV) Compounds under Microwave Irradiation
Tellurium(IV) tetrachloride, p-methoxyphenyltellurium trichloride and the corresponding products of its reaction with alkynes were prepared under very mild reaction conditions, in absence of organic solvents and in short reaction times all assisted by microwave irradiation.
J. Braz. Chem. Soc.. Publicado em: 2015-05
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8. Reagentes organometálicos: preparação e reatividade de compostos orgânicos de telúrio / Organometallic reagents: preparation and reactivity of organic compounds of tellurium
Nesta tese foram desenvolvidas metodologias sintéticas para a preparação de compostos orgânicos de telúrio empregando reagentes organometálicos. Primeiramente, foi estudada a abertura tipo SN2 de lactonas, por organoiltelurolatos de lítio ou magnésio para obtenção dos respectivos ácidos telurocarboxílicos. Os organoiltelurolatos foram preparados
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/11/2011
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9. Estruturas HÃbridas de Nanotubos de Carbono de Parede Simples e TelÃrio. / Single Wall Carbon Nanotubes and Tellurium Hybrid Structures
In this work we use Raman spectroscopy and electron microscopy to characterize hybrid carbon nanotube single-wall and tellurium nanostructures. Carbon nanotubes are important nanostructures due to their electrical, optical and mechanical properties, which makes them attractive for many applications in nanotechnology. However, for a wide range of applications
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/08/2011
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10. Síntese, caracterização e estudo da química de coordenação de novos compostos contendo Índio e Telúrio / Synthesis, characterization and study of the coordination chemistry of new compounds containing Indium and Tellurium
Neste trabalho estão descritas a síntese e a caracterização dos primeiros compostos envolvendo índio e telúrio nos quais o telúrio apresenta comportamento metálico frente ao índio. Foi desenvolvido um estudo da química de coordenação entre os elementos índio e telúrio em diferentes estados de oxidação, na presença de diferentes ligantes, com
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/07/2011
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11. Síntese e avaliação de compostos de selênio(IV) e telúrio(IV) como inibidores de cisteíno e treonino proteases / Synthesis and evaluation of selenium(IV) and tellurium(IV) compounds as cysteine and threonine proteases inhibitors
Neste trabalho está descrito a síntese e avaliação biológica de uma série de compostos de selênio(IV) e telúrio(IV). Esta série foi planejada para que diferentes fatores estruturais pudessem ser avaliados e as possíveis relações entre a estrutura e atividade biológica dos compostos pudessem ser determinadas. Para tanto, selênio, telúrio, cloro
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 20/07/2011
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12. ANÁLISE ESTRUTURAL DE COMPLEXOS DERIVADOS DE TELÚRIO / STRUCTURAL ANALYSIS OF TELLURIUM BASED COMPLEXES
Este trabalho apresenta a síntese e a análise estrutural de diferentes classes de complexos derivados de telúrio, com a obtenção de zwitterions, polímeros de coordenação, e também, complexos heteronucleares, a partir de ditelureto de bis-4-piridila (4) e do ligante N, N, N, N-tetraetil-N,N-piridina-2,6- dicarbonil-bis(tioureia) (12). Os ligantes uti
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 18/03/2011