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A New Heterogeneous Catalyst Obtained via Supramolecular Decoration of Graphene with a Pd2+ Azamacrocyclic Complex

2019; Multidisciplinary Digital Publishing Institute; Volume: 24; Issue: 15 Linguagem: Inglês

10.3390/molecules24152714

1433-1373

Matteo Savastano, Paloma Arranz‐Mascarós, M. Paz Clares, Rafael Cuesta, M.L. Godino-Salido, Lluís Guijarro, M.D. Gutiérrez-Valero, Mario Inclán, Antonio Bianchi, Enrique García‐España, Rafael López-Garzón,

Graphene and Nanomaterials Applications

A new G-(H2L)-Pd heterogeneous catalyst has been prepared via a self-assembly process consisting in the spontaneous adsorption, in water at room temperature, of a macrocyclic H2L ligand on graphene (G) (G + H2L = G-(H2L)), followed by decoration of the macrocycle with Pd2+ ions (G-(H2L) + Pd2+ = G-(H2L)-Pd) under the same mild conditions. This supramolecular approach is a sustainable (green) procedure that preserves the special characteristics of graphene and furnishes an efficient catalyst for the Cu-free Sonogashira cross coupling reaction between iodobenzene and phenylacetylene. Indeed, G-(H2L)-Pd shows an excellent conversion (90%) of reactants into diphenylacetylene under mild conditions (50 °C, water, aerobic atmosphere, 14 h). The catalyst proved to be reusable for at least four cycles, although decreasing yields down to 50% were observed.