Catalytic Hydrogenation of a Manganese(V) Nitride to Ammonia
Abstract
The catalytic hydrogenation of a metal nitride to make free ammonia using a rhodium hydride catalyst that promotes H2 activation and hydrogen atom transfer is described. The phenylimine-substituted rhodium complex, (η5-C5Me5)Rh(MePhI)H (MePhI = N-methyl-1-phenylethan-1-imine) exhibited higher thermal stability compared to the previously reported (η5-C5Me5)Rh(ppy)H (ppy = 2-phenylpyridine). DFT calculations established that the two rhodium complexes have comparable Rh–H bond dissociation free energies of 51.8 kcal mol-1 for (η5-C5Me5)Rh(MePhI)H and 51.1 kcal mol-1 for (η5-C5Me5)Rh(ppy)H. In the presence of 10 mol% of the phe-nylimine rhodium precatalyst and 4 atm of H2 in THF, the manganese nitride, (tBuSalen)Mn≡N underwent hydrogenation to liberate free ammonia with up to 6 total turnovers of NH3 or 18 turnovers of H·. The phenylpyridine analogue proved inactive for ammonia synthesis under identical conditions owing to competing deleterious hydride transfer chemistry. Subsequent research showed that the use of a non-polar solvent such as benzene suppressed formation of the cationic rhodium product resulting from the hydride transfer and enabled catalytic ammonia synthesis by proton coupled electron transfer.
- Authors:
-
- Princeton Univ., NJ (United States). Frick Lab.
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1616530
- Grant/Contract Number:
- SC0006498
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of the American Chemical Society
- Additional Journal Information:
- Journal Volume: 142; Journal Issue: 20; Journal ID: ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Kim, Sangmin, Zhong, Hongyu, Park, Yoonsu, Loose, Florian, and Chirik, Paul J. Catalytic Hydrogenation of a Manganese(V) Nitride to Ammonia. United States: N. p., 2020.
Web. doi:10.1021/jacs.0c03346.
Kim, Sangmin, Zhong, Hongyu, Park, Yoonsu, Loose, Florian, & Chirik, Paul J. Catalytic Hydrogenation of a Manganese(V) Nitride to Ammonia. United States. https://doi.org/10.1021/jacs.0c03346
Kim, Sangmin, Zhong, Hongyu, Park, Yoonsu, Loose, Florian, and Chirik, Paul J. Mon .
"Catalytic Hydrogenation of a Manganese(V) Nitride to Ammonia". United States. https://doi.org/10.1021/jacs.0c03346. https://www.osti.gov/servlets/purl/1616530.
@article{osti_1616530,
title = {Catalytic Hydrogenation of a Manganese(V) Nitride to Ammonia},
author = {Kim, Sangmin and Zhong, Hongyu and Park, Yoonsu and Loose, Florian and Chirik, Paul J.},
abstractNote = {The catalytic hydrogenation of a metal nitride to make free ammonia using a rhodium hydride catalyst that promotes H2 activation and hydrogen atom transfer is described. The phenylimine-substituted rhodium complex, (η5-C5Me5)Rh(MePhI)H (MePhI = N-methyl-1-phenylethan-1-imine) exhibited higher thermal stability compared to the previously reported (η5-C5Me5)Rh(ppy)H (ppy = 2-phenylpyridine). DFT calculations established that the two rhodium complexes have comparable Rh–H bond dissociation free energies of 51.8 kcal mol-1 for (η5-C5Me5)Rh(MePhI)H and 51.1 kcal mol-1 for (η5-C5Me5)Rh(ppy)H. In the presence of 10 mol% of the phe-nylimine rhodium precatalyst and 4 atm of H2 in THF, the manganese nitride, (tBuSalen)Mn≡N underwent hydrogenation to liberate free ammonia with up to 6 total turnovers of NH3 or 18 turnovers of H·. The phenylpyridine analogue proved inactive for ammonia synthesis under identical conditions owing to competing deleterious hydride transfer chemistry. Subsequent research showed that the use of a non-polar solvent such as benzene suppressed formation of the cationic rhodium product resulting from the hydride transfer and enabled catalytic ammonia synthesis by proton coupled electron transfer.},
doi = {10.1021/jacs.0c03346},
journal = {Journal of the American Chemical Society},
number = 20,
volume = 142,
place = {United States},
year = {Mon Apr 27 00:00:00 EDT 2020},
month = {Mon Apr 27 00:00:00 EDT 2020}
}
Web of Science
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