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- Title
Highly Functionalized SWCNTs with a Dopamine Derivative as a Support for Pd Nanoparticles: A Recyclable Catalyst for the Reduction of Nitro Compounds and the Heck Reaction.
- Authors
Campisciano, Vincenzo; Valentino, Laura; Laura Alfieri, Maria; La Parola, Valeria; Napolitano, Alessandra; Giacalone, Francesco; Gruttadauria, Michelangelo
- Abstract
Single‐walled carbon nanotubes (SWCNTs) were functionalized with a dopamine derivative in which the amine group was converted to azide (dopamine azide). The direct reaction of SWCNTs and dopamine azide in o‐dichlorobenzene at high temperature (160 °C) led to very highly functionalized CNTs (≈60 wt.%). Surprisingly, despite this high degree of functionalization, Raman spectroscopy detected a low disruption of the π‐network of the carbonaceous support. This finding was justified by the rehybridization from sp3 to sp2 of the sidewall carbon atoms of CNTs involved in the functionalization process. Further characterization by means of different techniques such as X‐ray photoelectron spectroscopy (XPS) analysis and transmission electron microscopy (TEM) allowed to shed some light on the chemical composition and morphology of the obtained material. Moreover, the estimation of the total content of phenolic units and their reducing potential after CNTs functionalization was also assessed using Folin and Ciocalteu and 2,2‐diphenyl‐1‐picryl hydrazide (DPPH) assays. The functionalization of CNTs was exploited to immobilize palladium(II) species that were subsequently reduced with NaBH4 leading to the formation of Pd nanoparticles (NPs). The so obtained hybrid material was used as a recyclable heterogeneous catalyst for the reduction of nitro compounds and the Heck reaction.
- Subjects
HECK reaction; CATALYSTS recycling; DOPAMINE; X-ray photoelectron spectroscopy; HYBRID materials; NITRO compounds
- Publication
Chemistry - A European Journal, 2023, Vol 29, Issue 58, p1
- ISSN
0947-6539
- Publication type
Article
- DOI
10.1002/chem.202301238