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nanoreactors for arene hydrogenations. In particular, HCO3 ,
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-
F- and CF3SO3 anions of ammonium salts have rarely been
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reported. The different systems were characterized by adapted
physico-chemical experiments (surface tension, DLS technique,
TEM analysis). The results confirm that easily prepared, active
and reusable green Rh(0) nanocatalysts protected by N-cetyl-N-(2-
hydroxyethyl) ammonium salts constitute an efficient partnership
for the reduction of arenes under mild and micellar conditions.
No bulk metal or sedimentation were observed during these
experiments. The size and the structure of the nanoparticles
seem to depend on the nature of the counter-ion and their
capacity to provide a strong or weak stabilization at the growing
particles’ surface. Worm-like Rh(0) nanospecies were observed
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with fluorinated ions such as F-, BF4 and CF3SO3 , whereas
-
-
isolated and spherical colloids were obtained with Cl- and HCO3
-
anions leading to relevant activities up to 3600 h-1.
To conclude, we have reported the most important series of
counter-ions of hydroxyethylammonium salts described in the
literature, and have shown that these new surfactants are efficient
capping and stabilizing agents of catalytically active rhodium
nanoparticles.
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This work and Ph. D. grant were supported by the Agence
Nationale de la Recherche (ANR), project MesAsColl/ANR-
08-CP2D. Thanks to Patricia Beaunier from UPMC for TEM
experiments.
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