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https://www.arca.fiocruz.br/handle/icict/6758
ELECTROSPRAY IONIZATION AND TANDEM MASS SPECTROMETRY CHARACTERIZATION OF NOVEL HETEROTRIMETALLIC RU(G5-C5H5)(DPPF)SNX3 COMPLEXES AND THEIR HETEROBIMETALLIC RU(G 5-C5H5)(DPPF)X PRECURSORS
Electrospray ionization
Ru–Sn–Fe complexes
Tandem mass spectrometry
Transient ionic species
Catalytic activity
Author
Affilliation
Universidade Federal de Minas Gerais. Departamento de Quımica. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Quımica. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Quımica. Belo Horizonte, MG, Brazil.
Fundação Oswaldo Cruz. Centro de Pesquisas Rene Rachou. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Quımica. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Quımica. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Quımica. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Quımica. Belo Horizonte, MG, Brazil.
Fundação Oswaldo Cruz. Centro de Pesquisas Rene Rachou. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Quımica. Belo Horizonte, MG, Brazil.
Universidade Federal de Minas Gerais. Departamento de Quımica. Belo Horizonte, MG, Brazil.
Abstract
Electrospray ionization and tandem mass spectrometry were used to characterize some novel heterotrimetallic complexes Ru(g5-C5H5)(dppf)SnX3(1) (dppf = diphenylphosphine ferrocene; X = Cl, Br) and their heterobimetallic precursors Ru(g5-C5H5)(dppf)X(2) (X = Cl, Br, I, N3). The positive-ion ESI mass spectra of1and2in acetonitrile solution showed the predominant presence of the [Ru(g5-C5H5)(dppf)] + cation (3)ofm/z721. In the positive-ion ESI mass spectrum of the complex Ru(g5 -C5H5)(dppf)N3 (2d), another prominent cation ofm/z735, i.e. [Ru(g5 -C5H5)(dppf)N] + (4), was also observed. Its formation was proposed to occur via the oxidation of the ruthenium atom (RuII!RuIII) followed by the loss of N2. The positive-ion ESI tandem mass spectra of ons 3and4showed mainly fragments formed by neutral losses of C5H5, C6H5and P(C6H5)2. Finally, cation 3was proposed to be the catalytic active species in the single-step conversion of methanol to acetic acid
Keywords
Ru–Sn complexesElectrospray ionization
Ru–Sn–Fe complexes
Tandem mass spectrometry
Transient ionic species
Catalytic activity
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