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Título: | Platinum nanoparticles stabilized by N-heterocyclic thiones. Synthesis and catalytic activity in mono- and di-hydroboration of alkynes. |
Autor(es): | Teixeira, Leonardo César de Moraes Figueiredo, Rute Cunha Espinós, Juan P. Vattie, Florencia Franconetti, Antonio Jaime, Carlos Lacroix, Bertrand Rojo Marcos, Francisco Javier Muñoz, Patricia Lara Conejero, Salvador |
Data do documento: | 2020 |
Referência: | TEXEIRA, L. C. de M. et al. Platinum nanoparticles stabilized by N-heterocyclic thiones. Synthesis and catalytic activity in mono- and di-hydroboration of alkynes. Nanoscale, v. 12, p. 6821-6831, 2020. Disponível em: <https://pubs.rsc.org/en/journals/journalissues/nr#!recentarticles&adv>. Acesso em: 10 jun. 2021. |
Resumo: | N-Heterocyclic Thiones (NHT) proved to be efficient ligands for the stabilization of small platinum nanoparticles (1.3–1.7 nm), synthesized by decomposition of [Pt(dba)2], under a H2 atmosphere, in the presence of variable sub-stoichiometric amounts of the NHT. Full characterization by means of TEM, HR-TEM, NMR, ICP, TGA and XPS have been carried out, providing information about the nature of the metal nanoparticles and the interaction of the NHT ligands to the metal surface. Importantly, DFT calculations indicate that some NHT ligands interact with the metal through the CvC double bond of the imidazole fragment in addition to the sulfur atom, thus providing additional stabilization to the nanoparticles. According to XPS, TGA and ICP techniques, the surface coverage by the ligand increases by decreasing the size of the substituents on the nitrogen atom. The platinum nanoparticles have been used as catalyst in the hydroboration of alkynes. The most active system is that with a less covered surface area lacking an interaction of the ligand by means of the CvC double bond. This catalyst hydroborates alkynes with excellent selectivities towards the monoborylated anti-Markovnikov product (vinyl-boronate) when one equiv. of borane is used. Very interestingly, aliphatic alkynes undergo a second hydroborylation process leading to the corresponding 1,1- and 1,2-diboroylated species with good selectivities towards the former. |
URI: | http://www.repositorio.ufop.br/jspui/handle/123456789/14282 |
DOI: | https://doi.org/10.1039/D0NR00251H |
ISSN: | 2040-3372 |
Licença: | This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. Fonte: o PDF do artigo. |
Aparece nas coleções: | DEQUI - Artigos publicados em periódicos |
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ARTIGO_PlatinumNanoparticlesStabilized.pdf | 3,77 MB | Adobe PDF | Visualizar/Abrir |
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