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UID:20250817T124117EDT-93040XUVVc@132.216.98.100
DTSTAMP:20250817T164117Z
DESCRIPTION:The use of hydrogen as an energy carrier offers a clean\naltern
 ative to current combustion of fossil fuels that produces\nharmful carbon 
 particulates\, oxides of nitrogen and sulfur\, and\nvoluminous quantities 
 of carbon dioxide. As others work on\nefficient production of hydrogen fro
 m water and sunlight\, we are\ninvestigating options for on-board hydrogen
  storage to enable\nlong-haul transportation that is key to moving goods a
 cross North\nAmerica. While metal hydrides and metal organic framework sor
 bents\nprovide reversible storage options\, they are currently unable to\n
 meet the storage capacity requirements for long-haul\ntransportation. So-c
 alled “chemical hydrides” such as\nazacycloalkanes can also serve as rever
 sible hydrogen storage\nmedia\, but activation barriers are high and dehyd
 rogenation rates\nremain slow with the best catalysts.\nWith both protic N
 -H and hydridic B-H bonds as well as three\nhydrogen atoms per main group 
 element\, ammonia-borane (AB\, H3NBH3)\nis a promising material for high c
 apacity hydrogen storage\napplications.1 Detailed studies of the dehydro-o
 ligomerization of\nAB has revealed a wealth of reaction products and react
 ion pathways\ndepending on reaction media and conditions\, additives and\n
 catalysts. Through detailed in situ NMR studies of AB\ndehydrogenation usi
 ng a variety of catalyst precursors we have\nidentified a key reaction int
 ermediate proposed to arise by\ntrapping of reactive aminoborane monomer\,
  H2NBH2\, by AB.2 A new\nfamily of chelating diamine bis(phosphine) iron c
 atalysts is\nproposed to dehydrogenate amine-boranes via a Noyori-type\nhe
 terolytic activation mechanism.3 Finally\, remaining technical\nbarriers t
 o commercialization of amine-borane fuels will be\ndescribed.\n1 Stephens\
 , F. H.\; Pons\, V.\; Baker\, R. T. Dalton Trans.\n2007\, 2613\; Marder\, 
 T. B. Angew. Chem. Int.\nEd. 2007\, 46\, 8116\; Hamilton\, C. H.\;\nBaker\
 , R. T.\; Staubitz\, A.\; Manners\, I. Chem. Soc. Rev.\n2009\, 38\, 279.\n
 2 Pons\, V.\; Baker\, R. T.\; Szymczak\, N. K.\; Heldebrant\, D. J.\;\nLin
 ehan\, J. C.\; Matus\, M. H.\; Grant\, D. J.\; Dixon\, D. A. Chem.\nCommun
 . 2008\, 6597.\n3 Blaquiere\, N.\; Diallo-Garcia\, S.\; Gorelsky\, S. I.\;
  Black\, D.\nA.\; Fagnou\, K. J. Am. Chem. Soc.\n2008\, 130\, 14034\; Kass
 \, M.\;\nFriedrich\, A.\; Drees\, M.\; Schneider\, S. Angew. Chem. Int.\nE
 d. 2009\, 48\, 905.\n
DTSTART:20091026T220000Z
DTEND:20091026T233000Z
LOCATION:Maass Chemistry Building\, CA\, QC\, Montreal\, H3A 0B8\, 801 rue 
 Sherbrooke Ouest
SUMMARY:Sigma Xi Lecture
URL:/channels/event/sigma-xi-lecture-111402
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