Compostos derivados de benzilcobaloximas: estudo por espectrometria de massas, análise térmica e eletroquímica

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dc.contributor.advisorDockal, Edward Ralph [UNESP]
dc.contributor.authorGuzzi Filho, Neurivaldo José de [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.date.accessioned2014-06-11T19:35:08Z
dc.date.available2014-06-11T19:35:08Z
dc.date.issued2001
dc.description.abstractIn this thesis organocobaloxime complexes, with the organic group being derived from a substituted benzyl, of the type [RCo(DMG)2py] where R is 3-F∅CH2, 3-CH3O∅CH2, 4-Cl∅CH2, 3,5-CF3,CF3∅CH2, 3-CN∅CH2, 3-Cl∅CH2, 3,4-Cl,Cl∅CH2 and C6F5CH2, were studied by the techniques of spectrometry of mass, thermal analysis and cyclic voltammetry. The complexes were synthesized by the reaction between dimethylglioxime (DMGH) pyridine, hexaaquocobalt(II) chloride in a medium alkaline and inert atmosphere, to generate a compound Co(I) and the posterior reaction of the latter with the respective reagent. All the compounds were characterized by the spectroscopic techniques of nuclear magnetic ressonance of 1H and of 13C, infrared and visible-ultraviolet, and elementary analyses of carbon, hydrogen, nitrogen and cobalt. Mass spectra were obtained for some complex by the “ionization for eletrons spray followed by decomposition of the ion formed by collision with a gas” (ESI-MSCID- MS), to obtain molecular mass and structural information. The spectra of the studied compounds presented common characteristics, showing that the fragmentations of the axial ligands R and py almost happen simultaneously. Thermal analyses were also performed by TG and DSC and the investigated complexes presented similar behavior, with the decomposition ocurring in three stages. The first two stages are attributed to the loss of the axial ligands, followed by the partial elimination of the equatorial ligand dimethylilglioxime. The final residue was identified as Co3O4, in which part of the oxigen present came from dimethylglioxime and not from of the atmosphere. Cyclic voltammetry studies of the complexes in acetonitrile showed that the oxidation of the complexes, occurs by an quasi-reversible process with transfer of an electron. The oxidized species is decomposed then, with the rupture of the Co-C bond.en
dc.format.extent96 f.
dc.identifier.aleph000152947
dc.identifier.capes33004030072P8
dc.identifier.citationGUZZI FILHO, Neurivaldo José de. Compostos derivados de benzilcobaloximas: estudo por espectrometria de massas, análise térmica e eletroquímica. 2001. 96 f. Tese (doutorado) - Universidade Estadual Paulista, Instituto de Química, 2001.
dc.identifier.fileguzzifilho_nj_dr_araiq.pdf
dc.identifier.urihttp://hdl.handle.net/11449/105814
dc.language.isopor
dc.publisherUniversidade Estadual Paulista (Unesp)
dc.rights.accessRightsAcesso aberto
dc.sourceAleph
dc.subjectEspectrometria de massapt
dc.subjectAnalise termicapt
dc.subjectEletroquimicapt
dc.subjectElectrochemistryen
dc.titleCompostos derivados de benzilcobaloximas: estudo por espectrometria de massas, análise térmica e eletroquímicapt
dc.typeTese de doutorado
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Química, Araraquarapt
unesp.graduateProgramQuímica - IQpt
unesp.knowledgeAreaQuímica inorgânicapt

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