Synthesis and structure of ruthenium-fullerides

Abstract

We report a simple and original procedure for preparing Ru–C60 polymeric chains, which spontaneously self-assemble as polymeric spherical particles, and can be surface decorated with Ru nanoparticles.

Chemoselective reduction of quinoline over Rh–C60 nanocatalysts

“…The reaction was allowed to react overnight at -20°C and the last TEM analysis performed showed that the size of the nanospheres remained similar, 255.7 ± 39.5 nm; while the Rh NP on the surface presented a bimodal distribution, 2.4 ± 0.7 and 4.7 ± 0.4 nm, and isolated NP were no longer observed. These observations make feasible to propose that, as previously observed during the synthesis of Ru-C60 compounds, 30 the nanospheres are composed by molecular species, which form this particular shape due to the stirring and the different viscosity between the assynthesized species and the solvent. 40 Figure S3).…”

“…These species are structurally similar to the ruthenium nanocatalysts stabilized with fullerene C60 described in a previous study by some of us. 30 In this abovementioned work, the decomposition under dihydrogen of [Ru(COD)(COT)] in the presence of fullerene C60 provided Ru based catalyst composed by Ru-C60 molecular spheres with the surface decorated with Ru NP; as pointed out by a combination of characterization techniques including TEM, WAXS, Extended X-Ray Absorption Fine Structure (EXAFS), and supported by DFT calculations. Also, Ru-C60 fulleride nanospheres synthesised in DCB displayed a size of 200.0 ± 38.5 nm , which is similar to the ones of Rh-C60 materials.…”

“…This behaviour has been previously observed for Ru-C60 species. 30 To gain further insight into the interactions between Rh and fullerene, XPS analyses of Rh-C60 1/1 and 10/1 were conducted (Figure 3, Figure S4 and Table S2). Peaks in the full XPS spectra indicate the presence of Rh, C and O elements on both samples ( Figure S4).…”

“…On the other hand, electron-poor Ru NP can be produced straightforward from the decomposition of (1,5-cyclooctadiene)(1,3,5-cyclooctatriene)ruthenium(0) [Ru(COD)(COT)] with H2 in the presence of fullerene C60. 30 This nanocatalyst shows excellent activity and selectivity in the hydrogenation of nitrobenzene. 31,32 The same methodology has been used to obtain other metal NP.…”

Theoretical investigation of interactions between palladium and fullerene in polymer

“…However, the Ni/Ni distance within the polymer chains was found to be slightly longer (11.230(6)Å at 280 K) than the Pd/Pd distances. Recently, 1-D C 60 Ru polymeric chains were theoretically studied by Leng et al 55 using periodic DFT calculations. According to their calculations, the most stable polymer is that with Ru atoms in a h 2(6) -h 6 Fig.…”