1,721,052 research outputs found
Ossidazione catalitica di fosfine diterziarie in presenza di complessi di Ni (I) e Ni (0)
No full textThe reaction of hydrogen cyanide with bis 1,4 - bis (diphenyl phosphino) butane nickel (0),
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Generation of size-controlled Pd0 nanoclusters inside of the nanoporous domains of gel-type resins: diverse and convergent support to a strategy of "Template Controlled Synthesis"
No full textIn the realm of supported metal catalysis, the metal component
is usually present as nanoparticles dispersed on the
surface of suitable metal oxides or on active carbon.
Synthetic procedures are normally directed to the generation
of size-controlled metal nanoclusters, whose circumstances
become mandatory when reactions to be catalyzed are
“structure sensitive”.In general, size control has been achieved by: directly
manufacturing metal-oxide-supported catalysts;by the
generation of kinetically stabilized metal nanoclusters in the
liquid phase and subsequent transfer of the protected
nanoclusters on to suitable supports; by generating metal
nanoclusters inside isoporous inorganic materials such as
mesoporous silicas. Herein, we report on three independent, convergent
pieces of structural evidence of this template-controlled
synthesis strategy to obtain size-controlled metal nanoclusters
suitable for synthesizing resin-supported metal catalysts
Polybenzimidazole as a Promising Support for Metal Catalysis: Morphology and Molecular Accessibility in the Dry and Swollen State
No full textPolybenzimidazole (PBI) in beaded form (250-500 mu m) has been characterized in the dry state by scanning electron microscopy (SEM), BET, and nitrogen porosimetry. In the swollen state, it has been characterized by inverse steric exclusion chromatography (ISEC) in tetrahydrofuran, toluene, and water, by ESR of TEMPONE (2,2,6,6-tetramethyl-4-oxo-1-oxypiperidine). and pulse field gradient spin echo (PGSE) NMR spectroscopy, toluene, in tetrahydrofuran, ethanol and water. The dry-state results are in good agreement with the ISEC results obtained in tetrahydrofuran, toluene, and water with regard to the 40-80 nm macroporosity. The swelling-dependent surface area and pore volume detected by ISEC in toluene and water reveal the amphiphilic nature of PBI
Reaction of dicyanodi 1,2 - bis (disphenylphosphino) ethane Cobalt (II) with oxigen and halkyl halides
No full textReversible addition of carbon monoxide to tertiary phophines complexes of Co (II) and their reduction to Co (I) carbonyl derivatives
No full textComplexes of Nickel (II) cyanide :with ditertiary phosphines and their reduction to Nickel (I) derivatives
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