Tin Iv
Mostrando 13-24 de 33 artigos, teses e dissertações.
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13. Different coordination modes for disulfoxides towards diorganotin(IV) dichlorides. X-ray crystal structures of 1,2-cis-bis-(phenylsulfinyl)ethene (rac-,cis-cbpse) and adducts [{Ph2SnCl2(meso-bpse)}n] and [{n-Bu2SnCl2(pdtd)}2]
As reações de meso-1,2-bis(fenilsulfinil)etano (meso-bpse) com Ph2SnCl2, de 2-fenil-1,3-ditiona trans-1-trans-dióxido (pdtd) com n-Bu2SnCl2 e de 1,2-cis-bis-(phenylsulfinyl)ethene (rac-,cis-cbpse) com Ph2SnCl2, na proporção molar 1:1, levaram à formação de [{Ph2SnCl2(meso-bpse)}n], [{n-Bu2SnCl2(pdtd)}2] e [{Ph2SnCl2(rac,cis-cbpse)}x] (x = 2 ou n), re
Journal of the Brazilian Chemical Society. Publicado em: 2009
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14. Micelle-mediated extraction and determination of tin in soft drink and water samples
Desenvolveu-se a pré-concentração em fase micelar de traços de estanho na determinação de Sn(IV) por espectrofotometria baseada na extração no ponto de nuvem (CPE) do complexo de Sn(IV) com violeta de pirocatecol em um meio surfactante. Violeta de pirocatecol (PCV) foi usado como agente quelante e brometo de cetiltrimetilamônio (CTAB) como agente su
Journal of the Brazilian Chemical Society. Publicado em: 2009
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15. Determinação de Sn(II) por polarografia: aplicação no controle de qualidade de reagentes liofilizados para radiodiagnóstico / Polarographic determination of Sn(II): application in the quality control of radiopharmaceutical reagents
Stannous chloride (SnCl2.2H2O) is the major compound used for reduction of generator-derived 99mTc-pertechnetate in cold kits for on site preparation of 99mTc-radiopharmaceuticals. These cold kits usually contain a ligand, stannous chloride, and different additives. Various techniques were described for tin determination, but they cannot distinguish between
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 11/07/2008
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16. Emprego de catalisadores de estanho(IV) em reações de transesterificação: obtenção de biodiesel. / Biodiesel obtention by transesterification using tin(IV) catalysts.
Neste trabalho investigou-se a atividade catalítica de quatro complexos metálicos exibindo caráter ácido de Lewis: dibutil diacetato de estanho, dibutil dilaurato de estanho, óxido de dibutil estanho e ácido butil estanóico. Estes catalisadores foram testados na alcoólise do óleo de soja e de mamona para a obtenção de uma mistura de ésteres de á
Publicado em: 2008
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17. Compostos organoestânicos com ação farmacológica
This work regards the mechanistic investigation of the biological activity of diorganotin complexes of aminobenzoic acid towards C. albicans cells (i); as well as the synthesis, characterization and biological activity of organotin derived of cholic acid (ii), 2,2-2,5-hiophenodiyl-bis(metilenenitrile)]-dibenzoic acid (iii) and 2-(3-oxociclohexen-1-enyl)amino
Publicado em: 2008
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18. Estudo da desoxigenação do produto de craqueamento catalítico de óleo de mamona (Ricinus communis) na presença de diversos catalisadores
The purely thermal cracking of castor oil produces a mixture of compounds with unsatisfactory fuel properties, as high viscosity, high acid value and low cetane index. This low quality is associated with high value of oxygenated products in obtained product composition. The aim of this work was to improve the physical-chemical properties of cracking product
Publicado em: 2007
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19. SYNTHESIS AND CHARACTERIZATION OF INORGANIC ION EXCHANGERS BASED ON MIXED OXIDE TIN-TITANIUM TO BE USED IN RECOVERY OF CADMIUM AND NICKEL AND PHOTOLUMINESCENT STUDIES / Síntese e caracterização de trocadores iônicos inorgânicos a base de óxidos mistos Estanho-Titânio para utilização na recuperação de Cádmio e Níquel e estudos fotoluminescentes
This work presents the synthesis, characterization and adsorption studies of inorganic ion exchangers based on mixed tin-titanium oxide for recovery of cadmium and nickel metals from aqueous effluents, discarded in the environment mainly through Ni-Cd battery. The exchangers were synthesized by sol-gel modified method using a mixture of tin(IV) chloride and
Publicado em: 2007
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20. Synthesis and spectroscopic characterization of tin(II) and tin(IV) complexes containing 2,3,5,6-tetrakis(alpha-pyridyl)pyrazine as a bridging ligand
Neste trabalho foram investigadas as reações entre o ligante heterocíclico nitrogenado 2,3,5,6-tetraquis(alfa-piridil)pirazina, TPP, e seis precursores de estanho, a saber: SnCl2, SnX4 (X = Cl ou Br), SnRCl3 (R = Ph ou Me) e SnPh2Cl2. Os produtos foram caracterizados por microanálise (C, H, N e Sn), espectroscopia no infravermelho (4000-200 cm-1), RMN de
Journal of the Brazilian Chemical Society. Publicado em: 2005-10
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21. Ethanol Electrooxidation with dimensionally stable anodes, DSA®, in NaCl medium / Eletrooxidação do etanol na presença de cloreto de sódio em eletrodos de óxidos de rutênio e irídio
In this work, it was investigated the electrocatalytic properties of oxides electrodes denominated dimensionally stable anodes, DSA®, in NaCl medium, applying them for ethanol oxidation. For this propose, many experimental parameters nave been investigated: the modulator oxide, changes in the preparation method of the electrode and pH changes of the solutio
Publicado em: 2005
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22. Preparation of highly dispersed Ru-Sn bimetallic supported catalysts from the single source precursors Cp(PPh3)2Ru-SnX3 (X = Cl or Br)
In this work highly dispersed Ru-Sn bimetallic catalysts have been prepared from organobimetallic Cp(PPh3)2Ru-SnX3 (X = Cl or Br) complexes. These single source precursors can be easily impregnated in high surface area supports, such as activated carbon and sol-gel SiO2, and upon controlled thermal treatment the ligands are released as volatile products resu
Materials Research. Publicado em: 2003-06
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23. Synthesis and characterization of heptacoordinated tin(IV) complexes. X-ray crystal structure of [nBu2Sn(dappt)]·(Me 2CO)0.5 [H2dappt = 2,6-diacetylpyridine bis(4-phenylthiosemicarbazone)]
As reações do ligante 2,6-diacetilpiridina bis(4-feniltiossemicarbazona), H2dappt, com R4-mSnXm (m = 2, 3; R = Me, nBu, Ph e X = Cl) resultaram na formação de quatro novos complexos organoestânicos heptacoordenados, os quais foram caracterizados por análise elementar e pelas espectroscopias no IV e Mössbauer. O derivado n-butila, [nBu2Sn(dappt)]·(Me
Journal of the Brazilian Chemical Society. Publicado em: 2001-08
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24. Estudo da interação entre SnCl4 e ligantes O e N-doadores por espectroscopia vibracional
In this work the interaction of tin (IV) tetrachloride with monodentated ligands of Gutmann s scale was studied, by analysing the vibrational spectra of 23 complexes with the general formula SnL2Cl4. It was observed that this scale can be used as a measurement of interaction strengths since the wavenumber of the stretching v(Sn-Cl) decrease as the interactio
Publicado em: 1980