TY - JOUR
T1 - Synthesis and Characterization of Alkyl-Imidazolium-Based Periodic Mesoporous Organosilicas
T2 - A Versatile Host for the Immobilization of Perruthenate (RuO4-) in the Aerobic Oxidation of Alcohols
AU - Karimi, Babak
AU - Elhamifar, Dawood
AU - Yari, Omolbanin
AU - Khorasani, Mojtaba
AU - Vali, Hojatollah
AU - Clark, James H.
AU - Hunt, Andrew J.
PY - 2012/10/15
Y1 - 2012/10/15
N2 - The preparation and characterization of a set of periodic mesoporous organosilicas (PMOs) that contain different fractions of 1,3-bis(3-trimethoxysilylpropyl)imidazolium chloride (BTMSPI) groups uniformly distributed in the silica mesoporous framework is described. The mesoporous structure of the materials was characterized by powder X-ray diffraction, transmission electron microscopy, and N2 adsorptiondesorption analysis. The presence of propyl imidazolium groups in the silica framework of the materials was also characterized by solid-state NMR spectroscopy and diffuse-reflectance Fourier-transform infrared spectroscopy. The effect of the BTMSPI concentration in the initial solutions on the structural properties (including morphology) of the final materials was also examined. The total organic content of the PMOs was measured by elemental analysis, whereas their thermal stability was determined by thermogravimetric analysis. Among the described materials, it was found that PMO with 10?% imidazolium content is an effective host for the immobilization of perruthenate through an ion-exchange protocol. The resulting Ru@PI-10 was then employed as a recyclable catalyst in the highly efficient aerobic oxidation of various types of alcohols.
AB - The preparation and characterization of a set of periodic mesoporous organosilicas (PMOs) that contain different fractions of 1,3-bis(3-trimethoxysilylpropyl)imidazolium chloride (BTMSPI) groups uniformly distributed in the silica mesoporous framework is described. The mesoporous structure of the materials was characterized by powder X-ray diffraction, transmission electron microscopy, and N2 adsorptiondesorption analysis. The presence of propyl imidazolium groups in the silica framework of the materials was also characterized by solid-state NMR spectroscopy and diffuse-reflectance Fourier-transform infrared spectroscopy. The effect of the BTMSPI concentration in the initial solutions on the structural properties (including morphology) of the final materials was also examined. The total organic content of the PMOs was measured by elemental analysis, whereas their thermal stability was determined by thermogravimetric analysis. Among the described materials, it was found that PMO with 10?% imidazolium content is an effective host for the immobilization of perruthenate through an ion-exchange protocol. The resulting Ru@PI-10 was then employed as a recyclable catalyst in the highly efficient aerobic oxidation of various types of alcohols.
KW - PALLADIUM NANOPARTICLES
KW - STABILIZED GOLD NANOCLUSTERS
KW - RECOVERABLE CATALYST
KW - organosilicas
KW - INTERPHASE CATALYST
KW - supported catalysts
KW - HYDROGEN-TRANSFER REACTIONS
KW - EFFICIENT HETEROGENEOUS CATALYSTS
KW - MOLECULAR-OXYGEN
KW - perruthenate
KW - ionic liquids
KW - mesoporous materials
KW - SUPPORTED IONIC LIQUIDS
KW - PHASE SILP CATALYSIS
KW - SELECTIVE OXIDATION
UR - http://www.scopus.com/inward/record.url?scp=84867212429&partnerID=8YFLogxK
U2 - 10.1002/chem.201200380
DO - 10.1002/chem.201200380
M3 - Literature review
SN - 0947-6539
VL - 18
SP - 13520
EP - 13530
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
IS - 42
ER -