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Journal articles
Active hydrogenation Rh nanocatalysts protected by new self-assembled supramolecular complexes of cyclodextrins and surfactants in water
Abstract : The stability of inclusion complexes between randomly methylated β-cyclodextrin (RaMeCD) or its leucine-grafted analogue (RaMeCDLeu) with two hydroxylated ammonium surfactants was investigated. The binding isotherms and complexation constants were measured using the Isothermal Titration Calorimetry (ITC) technique. These host-guest inclusion complexes were used as protective agents during the formation of rhodium(0) nanoparticles by chemical reduction of rhodium trichloride in water. The amount of protective agent was adjusted in order to ensure both stability and reactivity of the rhodium nanocatalysts under the catalytic conditions. The size and dispersion of air-stable and water-soluble rhodium suspensions were determined by Transmission Electron Microscopy (TEM) analyses. These spherical nanoparticles, with sizes between 1.20 to 1.50 nm according to the nature of inclusion complexes, were evaluated in the biphasic hydrogenation of various reducible compounds (olefins, linear or aromatic ketones), showing promising results in terms of activity and selectivity.
Keywords :
Supramolecular complexes
Cyclodextrins
Amino acids
Isothermal titration calorimetry
High resolution transmission electron microscopy
Ammonium surfactants
Rhodium compounds
Transmission electron microscopy
Surface active agents
Supramolecular chemistry
Rhodium
Nanoparticles
Ketones
Isotherms
Hydrogenation
Spherical nanoparticles
Host-guest inclusion complexes
Catalytic conditions
Chemical reduction
Complexation constants
https://hal-univ-rennes1.archives-ouvertes.fr/hal-01416441
Contributor : Laurent Jonchère Connect in order to contact the contributor
Submitted on : Monday, March 27, 2017 - 4:41:45 PM
Last modification on : Thursday, December 2, 2021 - 2:10:03 PM
Long-term archiving on: : Wednesday, June 28, 2017 - 3:29:41 PM
Contributor : Laurent Jonchère Connect in order to contact the contributor
Submitted on : Monday, March 27, 2017 - 4:41:45 PM
Last modification on : Thursday, December 2, 2021 - 2:10:03 PM
Long-term archiving on: : Wednesday, June 28, 2017 - 3:29:41 PM