Tag Archives: ssNMR

Solid-state NMR supports a study on Rh nanoparticles

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NHC-stabilised Rh nanoparticles: Surface study and application in the catalytic hydrogenation of aromatic substrates

F. Martinez-Espinar, P. Blondeau, P. Nolis, B. Chaudret, C. Claver, S. Castillón and C. Godard

DOI: 10.1016/j.jcat.2017.08.010

Highlights

  • Synthesis and characterisation of small RhNPs stabilised by N-heterocyclic carbenes.
  • Evidence of the location of the ligands on the faces, edges and apexes of the NPs.
  • Hydrogenation of aromatic ketones, phenols and N-heteroaromatic substrates.
  • Tuning of the selectivity as a function of the reaction conditions.
  • Full reduction of quinoline under mild conditions with total selectivity.

13C{1H} CP-MAS spectra of (a) L, (b) Rh0.4, (c) Rh0.4 + CO and (d) 13C-Rh0.4.

11B-MQMAS Solid State NMR experiment performed on polyaminoborane derivatives

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no spine minimum. half size. Editor: Tamara Hanna JEM: Esther RTP: Bryan NolteAmmonia Borane Dehydrogenation Promoted by a Pincer-Square-Planar Rhodium(I) Monohydride: A Stepwise Hydrogen Transfer from the Substrate to the Catalyst
Esteruelas, M.A.; Nolis, P.; Oliván, M.; Oñate, M.; Vallribera, A.; Vélez, A. Inorg. Chem., 2016, 55 (14), pp 7176–7181. DOI: 10.1021/acs.inorgchem.6b01216

The pincer d8-monohydride complex RhH-{xant(PiPr2)2} (xant(PiPr2)2 = 9,9-dimethyl-4,5-bis-(diisopropylphosphino)xanthene) promotes the release of 1 equiv of hydrogen from H3BNH3 and H3BNHMe2 with TOF50% values of 3150 and 1725 h−1, to afford [BH2NH2]n and [BH2NMe2]2 and the tandem ammonia borane dehydrogenation−cyclohexene hydrogenation. Continue reading 11B-MQMAS Solid State NMR experiment performed on polyaminoborane derivatives →