Journal
NANOSCALE
Volume 8, Issue 22, Pages 11371-11374Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6nr01460g
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Funding
- Elements Strategy Initiative for Catalysts & Batteries (ESICB)
- Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan [26248003]
- Nanotechnology Platform from the Ministry of Education, Culture, Sports, Science, and Technology (MEXT) of Japan
- Grants-in-Aid for Scientific Research [26248003] Funding Source: KAKEN
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Iridium clusters nominally composed of 15, 30 or 60 atoms were size-selectively synthesized within OH-terminated poly(amidoamine) dendrimers of generation 6. Spectroscopic characterization revealed that the Ir clusters were partially oxidized. All the Ir clusters efficiently converted 2-nitrobenzaldehyde to anthranil and 2-aminobenzaldehyde under atmospheric hydrogen at room temperature in toluene via selective hydrogenation of the NO2 group. The selectivity toward 2-aminobenzaldehyde over anthranil was improved with the reduction of the cluster size. The improved selectivity is ascribed to more efficient reduction than intramolecular heterocyclization of a hydroxylamine intermediate on smaller clusters that have a higher Ir(0)-phase population on the surface.
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