INFIQC   05475
INSTITUTO DE INVESTIGACIONES EN FISICO- QUIMICA DE CORDOBA
Unidad Ejecutora - UE
artículos
Título:
PVP-stabilized palladium nanoparticles electrochemically obtained as effective catalysts in aqueous medium Suzuki-Miyaura reaction
Autor/es:
PAULA M. UBERMAN; LUIS A. PÉREZ; GABRIELA I. LACCONI*; SANDRA E. MARTÍN*
Revista:
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012 vol. 363 p. 245 - 253
ISSN:
1381-1169
Resumen:
In this paper the synthesis of stable palladium nanoparticles (PdNPs) by electrochemical methods at room temperature is reported. Direct electroreduction of H2PdCl4 aqueous solution in the presence of poly- (N-vinyl-2-pirrolydone) (PVP) onto platinum electrodes was performed by the application of a constant current density pulse. By simultaneous stirring of the electrolyte, the NPs formed on the electrode surface were stabilized with PVP in the solution. The resulting PdNPs were characterized by transmission electron microscopy and the total content of palladium was analytically determined by atomic absorption measurements. The average size of the NPs (in the range of 10-22 nm) was tuned by changing the current density applied. The PdNPs prepared by this methodology exhibited highly efficient catalytic activity on Suzuki-Miyaura coupling reaction in aqueous medium. Particularly high turnover numbers (TON up to 104-105) were achieved by these PVP-stabilized PdNPs with aryl iodides and bromides.