%0 Journal Article
%A Giacalone, Francesco
%A Campisciano, Vincenzo
%A Calabrese, Carla
%A Parola, Valeria La
%A Syrgiannis, Zois
%A Prato, Maurizio
%A Gruttadauria, Michelangelo
%D 2016
%T Single-Walled
Carbon Nanotube–Polyamidoamine
Dendrimer Hybrids for Heterogeneous Catalysis
%U https://acs.figshare.com/articles/journal_contribution/Single_Walled_Carbon_Nanotube_Polyamidoamine_Dendrimer_Hybrids_for_Heterogeneous_Catalysis/3125392
%R 10.1021/acsnano.6b00936.s001
%2 https://ndownloader.figshare.com/files/4863031
%K turnover frequency
%K PdCl 4
%K 6 times
%K convergent strategy
%K Heck reaction
%K Pd species
%K nanotube length
%K Additional experiments
%K Suzuki
%K SWCNT
%K refluxing toluene
%K palladium nanoparticles
%K Heterogeneous Catalysis
%K dendrimer
%K catalyst
%K 48 000
%K Heck reactions
%K TOF
%K material
%K turnover number
%K PAMAM
%K 566 000
%K generations 2.5
%X We report the synthesis and catalytic
properties of single-walled
carbon nanotubepolyamidoamine dendrimers hybrids (SWCNT–PAMAM),
prepared via a convergent strategy. The direct reaction
of cystamine-based PAMAM dendrimers (generations 2.5 and 3.0) with
pristine SWCNTs in refluxing toluene, followed by immobilization and
reduction of [PdCl4]2–, led to the formation
of highly dispersed small palladium nanoparticles homogeneously confined
throughout the nanotube length. One of these functional materials
proved to be an efficient catalyst in Suzuki and Heck reactions, able
to promote the above processes down to 0.002 mol % showing a turnover
number (TON) of 48 000 and a turnover frequency (TOF) of 566 000
h–1. In addition, the hybrid material could be recovered
and recycled for up to 6 times. No leaching of the metal has been
detected during the Suzuki coupling. Additional experiments carried
out on the spent catalyst permitted to suggest that a “release
and catch” mechanism is operative in both reactions, although
during Heck reaction small catalytically active soluble Pd species
are also present.
%I ACS Publications