Iridium Catalyzed Dehydrogenation of Substituted Amine Boranes: Kinetics, Thermodynamics and Implications for Hydrogen Storage.

Journal Article · Mon Oct 06 04:00:00 EDT 2008 · Inorganic Chemistry, 47(19):8583-8585

DOI:https://doi.org/10.1021/ic801161g· OSTI ID:946629

Dietrich, Brandon L; Goldberg, Karen I; Heinekey, D M; Autrey, Thomas; Linehan, John C

Dehydrogenation of ammonia borane (AB) and methylamine-borane (MeAB) is catalyzed efficiently by the iridium pincer complex (η3-1,3-(OPtBu2)2C6H3)Ir(H)2 (1). With MeAB and with MeAB/AB mixtures, rapid release of one equivalent of H2 is observed to yield soluble oligomeric products at rates similar to those previously reported for the dehydrogenation of AB catalyzed by 1. The rapid dehydrogenation reaction has allowed the experimental determination of the reaction enthalpy (ΔH) for the dehydrogenation of AB, MeAB, and AB/MeAB mixtures by calorimetry. The reactions are significantly more exothermic than suggested by some computational studies. This work was supported by the U.S. Department of Energy (DOE) as part of the Center of Excellence for Chemical Hydrogen Storage. PNNL is operated by Battelle for DOE.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 946629
• Report Number(s): PNNL-SA-62015; EB4202000
• Journal Information: Inorganic Chemistry, 47(19):8583-8585, Journal Name: Inorganic Chemistry, 47(19):8583-8585 Journal Issue: 19 Vol. 47; ISSN 0020-1669; ISSN INOCAJ
• Country of Publication: United States
• Language: English

Related Subjects

08 HYDROGEN
AMINES
AMMONIA
BORANES
CALORIMETRY
DEHYDROGENATION
ENTHALPY
HYDROGEN STORAGE
IRIDIUM
KINETICS
MIXTURES
THERMODYNAMICS