Details

Autor(en) / Beteiligte

• Musza, Katalin
• Mészáros, Rebeka
• Baán, Kornélia
• Kónya, Zoltán
• Kukovecz, Ákos
• Pálinkó, István
• Sipos, Pál
• Szabados, Márton

Titel

Mechanochemical preparation of NiCuSn nanoparticles and composites in presence of cetyltrimethylammonium bromide (CTAB) and the catalytic application of the products in homocoupling and hydration of terminal alkynes

Ist Teil von

• Journal of molecular structure, 2022-08, Vol.1262, p.132948, Article 132948

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •Mechanochemical synthesis of NiCuSn nanoparticles and composites was carried out.•The effect of milling parameters (intensity, duration) was elucidated.•Formation of NiSn and CuSn intermetallics, and Cu/Sn-oxide species was observed.•Cu, Cu2O or bronze facilitated 1,3-diyne formation by terminal alkyne homocoupling.•Sn and SnO2 containing catalysts were efficient in ketone and α-diketone synthesis. We report the synthesis of the NiCuSn nanoparticles and nanocomposites in mechanochemical route using CTAB as milling additive. The study of grinding intensity (frequency) and time interval drew up the importance of the well-chosen operation parameters. The mild milling resulted in formation of NiSn intermetallics, while the intense ones aided the evolution of bronze and copper(I) oxide phases. The utilization of CTAB proved to be the key factor to prevent or slow down the process of mechanical alloying and to fritter the metal grains into the nanodimensions. The dynamic light scattering data demonstrated positively charged particles with average solvodynamic diameters of around 70 nm applying intense or long-term millings. Without CTAB or with relatively short or weak grindings, these values remained between 230 and 550 nm, as in the case of the surface areas getting around 20 m2/g with and 1 m2/g without CTAB. The catalytic transformation of p-methoxyphenylacetylene in dimethyl sulfoxide showed that the copper, copper(I) oxide and bronze particles managed the reaction toward the evolution of 1,3-diyne in Glaser-Hay homocoupling without base addition, while the Sn and SnO2 phases assisted to the Markovnikov-type hydration of alkyne groups. The formation of α-diketone signed that the anti-Markovnikov route was also occurred. The use of CTAB was found to exert a profound effect on the quality of catalytic end-products through the controlled generation of bronze and tin oxide phases and the solid solution of nickel atoms. [Display omitted] .