New synthetic approaches to ammonia-borane and its deuterated derivatives

Hu, Mengnan; Paasschen, J. M. Van; Geanangel, R. A.

doi:10.1016/0022-1902(77)80383-7

Cited by 92 publications

(67 citation statements)

References 7 publications

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“…Figure 2 presents the FTIR spectrum of the post-milled AB/0.5MgH 2 sample and those of the pristine AB (milled for 2 h) and MgH 2 reference samples. The post-milled pristine AB sample exhibits the IR bands that are in excellent agreement with the literature data (Figure 2 b), [30,31] suggesting that mechanical milling alone exerts no appreciable influence on the bond structure of AB. After milling with MgH 2 , the sample showed superposed IR spectra of the two individual phases with no appreciable frequency shift of the characteristic bands.…”

Section: Resultssupporting

confidence: 83%

Renewed Insight into the Promoting Mechanism of Magnesium Hydride on Ammonia Borane

Luo¹,

Kang²,

Wang³

2010

ChemPhysChem

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Our previous study found that mechanically milling with magnesium hydride (MgH(2)) could dramatically improve the dehydrogenation property of ammonia borane (AB). Meanwhile, it appears that the MgH(2) additive maintains its phase stability in the milling and subsequent heating process. In an effort to further the mechanistic understanding of the AB/MgH(2) system, we reinvestigated the property and structure evolution in the hydrogen release process of the AB/0.5MgH(2) sample. Property examination using volumetric method and synchronous thermal analyses showed that the AB/0.5 MgH(2) sample releases approximately 13.8 wt % hydrogen after being heated at 300 degrees C. This hydrogen amount is in excess of that available from AB, indicative of the participation of a faction of MgH(2) in the dehydrogenation process of AB. Structural and chemical state analyses using Fourier transformation infrared spectroscopy and solid-state (11)B nuclear magnetic resonance techniques further showed that part of MgH(2) participates in the dehydrogenation process of AB from the first step, resulting in the formation of Mg-B-N-H intermediate species. The incorporation of Mg in AB is believed to be a crucial event leading to dehydrogenation property improvements, particularly for the release of the last equivalent of H(2) in AB at relatively moderate temperature. These findings have provided renewed insight into the promoting mechanism of MgH(2) on the hydrogen release from AB.

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Section: Resultssupporting

confidence: 83%

Renewed Insight into the Promoting Mechanism of Magnesium Hydride on Ammonia Borane

Luo¹,

Kang²,

Wang³

2010

ChemPhysChem

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“…Ammonia borane (NH 3 BH 3 , AB) was synthesized by the reaction of ammonium carbonate and sodium borohydride in a tetrahydrofuran solution following a literature procedure. [23] The purity of the AB sample was verified by powder X-ray diffraction examination and elemental analyses.…”

Section: Methodsmentioning

confidence: 99%

Ammonia Borane Destabilized by Lithium Hydride: An Advanced On‐Board Hydrogen Storage Material

et al. 2008

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“…Boron-based materials play significant parts in chemical synthesis [2]. Ammonia-borane, known for long time [3], has possible use in laserinduced nuclear fusion because of its high hydrogen content and other favorable properties [4]. Such molecules are also candidates to be used as additives in rocket fuel [S].…”

Section: Introductionmentioning

confidence: 99%

Early stages of LiX, BeH₂X, and BH₃X pyrolysis (X stands for NH₃ or OH₂): A theoretical study of weak dative complex stability

Sana

Leroy

1993

Int J of Quantum Chemistry

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In this work, we study theoretically the thermal decomposition of weak dative complexes (namely, the complexes between BH3, BeH2, or LiH and ammonia or water). The most accurate calculations have been carried out at the ~~4sdtq/6-311+ +G(3df,2p) level on MP2fu11/6-31c** fully optimized geometries. The transition structures for hydrogen evolution are described. The rate constants were obtained using conventional transition-state theory. Stability conditions for the complexes were considered. Water complexes are less stable than are the corresponding ammonia derivatives. Lithium complexes seem to be very unstable. It seems that beryllium compounds could be synthesized. Borane derivatives are known experimentally. We find, as observed, that the first hydrogen evolution occurs only above room temperature. Iminoborane seems not to be easily accessible under pyrolysis conditions. Other reactions require less activation energy. Finally, the early stages of the ammonia-borane pyrolysis and paths to open-chain polymers as well as to cyclic structures are described. 0 1993 John Wiley & Sons, Inc.

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New synthetic approaches to ammonia-borane and its deuterated derivatives

Cited by 92 publications

References 7 publications

Renewed Insight into the Promoting Mechanism of Magnesium Hydride on Ammonia Borane

Renewed Insight into the Promoting Mechanism of Magnesium Hydride on Ammonia Borane

Ammonia Borane Destabilized by Lithium Hydride: An Advanced On‐Board Hydrogen Storage Material

Early stages of LiX, BeH₂X, and BH₃X pyrolysis (X stands for NH₃ or OH₂): A theoretical study of weak dative complex stability

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New synthetic approaches to ammonia-borane and its deuterated derivatives

Cited by 92 publications

References 7 publications

Renewed Insight into the Promoting Mechanism of Magnesium Hydride on Ammonia Borane

Renewed Insight into the Promoting Mechanism of Magnesium Hydride on Ammonia Borane

Ammonia Borane Destabilized by Lithium Hydride: An Advanced On‐Board Hydrogen Storage Material

Early stages of LiX, BeH2X, and BH3X pyrolysis (X stands for NH3 or OH2): A theoretical study of weak dative complex stability

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Early stages of LiX, BeH₂X, and BH₃X pyrolysis (X stands for NH₃ or OH₂): A theoretical study of weak dative complex stability