Microwave-Assisted Functionalization of Single-Walled Carbon Nanotubes as a Platform for a Supported Iridium Catalyst

Abstract

The single-walled carbon nanotubes (SWCNT) are allowed to react with imino esters via 1,3-dipolar cycloaddition activated by thermal 1,2-prototropy. The reaction is optimized and analyzed using different heating methods. The functionalization affords pyrrolidino-nanotubes, which were characterized using several techniques. The ester group is next transformed in the corresponding SWCNT-iridium carboxylate, and as a proof of concept, tested in the conventional hydrogen transfer reaction of acetophenone to yield 1-phenylethanol

Nitrogen-enriched Carbon Nanotube Supported Palladium as a Catalyst for Desulfurization of Dibenzothiophene and Reduction of Nitroarenes

“…The second weight loss of 57% was attributed to the destruction of the CNT structure. Analogously for sample (5), a 16% and a 57% were detected for the same ranges of the temperature, respectively. According to this data, and considering quantitative yield in all the steps required for the preparation of carbon materials (3) and ( 5), the functionalization was estimated in 0.94 and 0.70%, respectively.…”

“…Next, CNT-epoxy was reacted with sodium azide followed by a reaction azido-CNT (2) with IL(B) under CuAAC to produce (3). Furthermore, IL-modified CNT was reacted with sodium azide and resulting compound (4) was treated with 1-(prop-2-yn-1-yl)-1H-imidazole under CuAAC (click reaction) to produce the nitrogen-enriched CNT (5). Finally, modified CNT was mixed with Na2PdCl4 to afford a CNT-supported palladium catalyst (6) which was referred as CNT-TZ-IL@Pd throughout the text (Scheme 1).…”

“…Also, XPS of the Pd 3d region showed a doublet at 339.2 (Pd 3d3/2) and 344.5 eV (Pd 3d5/2) due to the presence of Pd(II) species [29]. Thermal gravimetric analysis (TGA) of CNT, modified CNT (3), and (5) in temperatures between 25-700 °C were carefully surveyed (Figure 6). TGA obtained from CNT-IL (3) showed two major weight losses in the temperature range of 150-350 and 350-420 °C.…”

“…[1,2]. Due to the high chemical and physical stability of CNTs, recently, they can extensively be used in the design of heterogeneous catalysts [3][4][5]. Despite their unique properties, CNTs are chemically ineffective, hydrophobic, and have little activity on their own.…”