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Higaki T, Kitazawa H, Yamazoe S, et al. Partially oxidized iridium clusters within dendrimers: size-controlled synthesis and selective hydrogenation of 2-nitrobenzaldehyde. Nanoscale. 2016;8(22):11371-4doi: 10.1039/c6nr01460g.
Higaki, T., Kitazawa, H., Yamazoe, S., & Tsukuda, T. (2016). Partially oxidized iridium clusters within dendrimers: size-controlled synthesis and selective hydrogenation of 2-nitrobenzaldehyde. Nanoscale, 8(22), 11371-4. https://doi.org/10.1039/c6nr01460g
Higaki, Tatsuya, et al. "Partially oxidized iridium clusters within dendrimers: size-controlled synthesis and selective hydrogenation of 2-nitrobenzaldehyde." Nanoscale vol. 8,22 (2016): 11371-4. doi: https://doi.org/10.1039/c6nr01460g
Higaki T, Kitazawa H, Yamazoe S, Tsukuda T. Partially oxidized iridium clusters within dendrimers: size-controlled synthesis and selective hydrogenation of 2-nitrobenzaldehyde. Nanoscale. 2016 Jun 02;8(22):11371-4. doi: 10.1039/c6nr01460g. PMID: 27193739.
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Nanoscale. 2016 Jun 02;8(22):11371-4. doi: 10.1039/c6nr01460g.

Partially oxidized iridium clusters within dendrimers: size-controlled synthesis and selective hydrogenation of 2-nitrobenzaldehyde.

Nanoscale

Tatsuya Higaki, Hirokazu Kitazawa, Seiji Yamazoe, Tatsuya Tsukuda

Affiliations

  1. Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. [email protected].
  2. Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan. [email protected] and Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Katsura, Kyoto 615-8520, Japan.

PMID: 27193739 DOI: 10.1039/c6nr01460g

Abstract

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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