Journal ArticleDOI
Iron complex-catalyzed ammonia-borane dehydrogenation. A potential route toward B-N-containing polymer motifs using earth-abundant metal catalysts.
R. Tom Baker,John C. Gordon,Charles W. Hamilton,Neil J. Henson,Po-Heng Lin,Steven Maguire,Muralee Murugesu,Brian L. Scott,Nathan C. Smythe +8 more
TLDR
Four Fe complexes containing amido and phosphine supporting ligands were synthesized, and their reactivity with AB was examined, and it was found that Fe supported by a bidentate P-N ligand can be used in a second cycle to afford a similar product mixture.Abstract:
Ammonia-borane (NH(3)BH(3), AB) has garnered interest as a hydrogen storage material due to its high weight percent hydrogen content and ease of H(2) release relative to metal hydrides. As a consequence of dehydrogenation, B-N-containing oligomeric/polymeric materials are formed. The ability to control this process and dictate the identity of the generated polymer opens up the possibility of the targeted synthesis of new materials. While precious metals have been used in this regard, the ability to construct such materials using earth-abundant metals such as Fe presents a more economical approach. Four Fe complexes containing amido and phosphine supporting ligands were synthesized, and their reactivity with AB was examined. Three-coordinate Fe(PCy(3))[N(SiMe(3))(2)](2) (1) and four-coordinate Fe(DEPE)[N(SiMe(3))(2)](2) (2) yield a mixture of (NH(2)BH(2))(n) and (NHBH)(n) products with up to 1.7 equiv of H(2) released per AB but cannot be recycled (DEPE = 1,2-bis(diethylphosphino)ethane). In contrast, Fe supported by a bidentate P-N ligand (4) can be used in a second cycle to afford a similar product mixture. Intriguingly, the symmetric analogue of 4 (Fe(N-N)(P-P), 3), only generates (NH(2)BH(2))(n) and does so in minutes at room temperature. This marked difference in reactivity may be the result of the chemistry of Fe(II) vs Fe(0).read more
Citations
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Journal ArticleDOI
Ammonia–Borane and Amine–Borane Dehydrogenation Mediated by Complex Metal Hydrides
Andrea Rossin,Maurizio Peruzzini +1 more
TL;DR: This review is a comprehensive survey of the last 10 years of research on ammonia-borane and amine-boranes dehydrogenation mediated by complex metal hydrides (CMHs), within the broader context of chemical hydrogen storage.
Journal ArticleDOI
Boron–nitrogen–hydrogen (BNH) compounds: recent developments in hydrogen storage, applications in hydrogenation and catalysis, and new syntheses
Zhenguo Huang,Tom Autrey +1 more
TL;DR: The strong efforts devoted to the exploration of BNH compounds for hydrogen storage have led to impressive advances in the field of boron chemistry as mentioned in this paper, and a review summarizes progress in this field from three aspects.
Journal ArticleDOI
Catalysis in service of main group chemistry offers a versatile approach to p-block molecules and materials
TL;DR: An overview of this emerging area of catalytic reactions that enable the formation of new bonds to carbon centres is presented with a focus on recent developments and future challenges.
Journal ArticleDOI
Boryl-mediated reversible H2 activation at cobalt: catalytic hydrogenation, dehydrogenation, and transfer hydrogenation.
Tzu-Pin Lin,Jonas C. Peters +1 more
TL;DR: The ability of boron to switch between a boryl and a dihydridoboratocobalt conformation makes possible the reversible conversion of 2 and 3, which is explored in the context of catalytic olefin hydrogenation as well as amine-borane dehydrogenation/transfer hydrogenation.
Journal ArticleDOI
Ammonia borane, a material with exceptional properties for chemical hydrogen storage
TL;DR: Ammonia borane has exceptional properties for chemical hydrogen storage and the recent years have witnessed many efforts in making it implementable for both thermolytic and hydrolytic dehydrogenations as mentioned in this paper.
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