THE STRUCTURE OF H<sub>3</sub>NBH<sub>3</sub>

Lippert, Ernest L.; Lipscomb, William N.

doi:10.1021/ja01583a075

Cited by 90 publications

(34 citation statements)

References 2 publications

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“…The dominance of the I 4-N spin-lattice relaxation by the quadrupolar interaction is confirmed by the excellent agreement of "B and 1 4~ TI measurements with eq. [6]. The results presented here suggest that, at the temperatures studied, molecular reorientation is the dominant pathway for "N relaxation.…”

Section: Nitrogen-14 Relaxationmentioning

confidence: 50%

See 1 more Smart Citation

Boron-11, boron-10, and nitrogen-14 NMR relaxation rates and quadrupole coupling constants in BH₃NH₃

Penner¹,

Daleman²,

Custodio³

1992

Can. J. Chem.

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. Can. J. Chem. 70, 2420 (1 992). The "B, "B, and I4N spin-lattice relaxation times (TI) for aqueous solutions of BH,NH, were measured by NMR spectroscopy. The results of this investigation are consistent with the nuclear quadrupolar coupling constants reported in previous nuclear quadrupolar resonance and microwave studies. The activation energy associated with rotational reorientation of BH3NH3 in aqueous solution is 1 1.7 * 0.6 kJ/mol. Electric field gradients were calculated at various levels of ab initio molecular orbital theory, in order to obtain theoretical "N and "B quadrupolar coupling constants. At

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Section: Nitrogen-14 Relaxationmentioning

confidence: 50%

“…Analyses of these spectra have yielded the gasphase geometry, dipole moment, and barrier to internal rotation (3,4). Three crystal structure investigations have been reported (5)(6)(7). The most recent (7) suggests that there is an order-disorder phase transition in solid BH,NH, at 225 K.…”

Section: Introductionmentioning

confidence: 99%

Boron-11, boron-10, and nitrogen-14 NMR relaxation rates and quadrupole coupling constants in BH₃NH₃

Penner¹,

Daleman²,

Custodio³

1992

Can. J. Chem.

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“…The first report of temperature-induced phase I to II transition at ambient pressure was dated back to 1956 by Lippert et al [71] and Hughes [72] soon after ammonia borane was discovered. The transition was observed at (230 ± 5) K. However, there was no any further study on the low-temperature transformation at high pressures for more than five decades after this observation.…”

Section: Phase Transitions At Low Temperaturesmentioning

confidence: 99%

“…Lippert et al [71] and Hughes [72] determined the crystal structure using XRD. However, they were not able to determine the hydrogen atom positions in the structure.…”

Section: Phase Imentioning

confidence: 99%

Ammonia borane at high pressures

et al. 2014

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Ammonia borane has received tremendous research attention in the past decade because of its potential for chemical hydrogen storage. This paper reviews recent studies about the behavior of ammonia borane at high pressures. While much work is still needed to comprehensively understand the pressure influence on this molecular crystal, a phase diagram based on the available experimental and theoretical data is constructed. Raman spectroscopy studies indicate five transitions upon compression up to 65 GPa at ambient temperature. Diffraction experiments and theoretical studies demonstrate that three of these transitions are first-order phase transformations in the sequence of I4mm-Cmc2 1 -P2 1 -(different) P2 1 , and two are iso-structural. A low-temperature phase (Pmn2 1 ) and a high-temperature high-pressure phase (Pmna) are also recognized.

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“…[32] As SB is the starting material for preparing AB, the latter will always remain much more expensive; the cost factor is one of the issues preventing the use of SB. [33] 2.2 Physicochemical properties of ammonia borane At low temperatures, [34,35] AB possesses a face-centered orthorhombic Pmn2 1 phase ( Figure 2) that undergoes a transition to a body-centered tetragonal I4mm phase at temperatures above À48 8C.…”

Section: Synthesis Of Ammonia Boranementioning

confidence: 99%

Hydrolysis of Ammonia Borane as a Hydrogen Source: Fundamental Issues and Potential Solutions Towards Implementation

et al. 2011

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In today's era of energy crisis and global warming, hydrogen has been projected as a sustainable alternative to depleting CO(2)-emitting fossil fuels. However, its deployment as an energy source is impeded by many issues, one of the most important being storage. Chemical hydrogen storage materials, in particular B-N compounds such as ammonia borane, with a potential storage capacity of 19.6 wt % H(2) and 0.145 kg(H2)L(-1), have been intensively studied from the standpoint of addressing the storage issues. Ammonia borane undergoes dehydrogenation through hydrolysis at room temperature in the presence of a catalyst, but its practical implementation is hindered by several problems affecting all of the chemical compounds in the reaction scheme, including ammonia borane, water, borate byproducts, and hydrogen. In this Minireview, we exhaustively survey the state of the art, discuss the fundamental problems, and, where applicable, propose solutions with the prospect of technological applications.

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THE STRUCTURE OF H₃NBH₃

Cited by 90 publications

References 2 publications

Boron-11, boron-10, and nitrogen-14 NMR relaxation rates and quadrupole coupling constants in BH₃NH₃

Boron-11, boron-10, and nitrogen-14 NMR relaxation rates and quadrupole coupling constants in BH₃NH₃

Ammonia borane at high pressures

Hydrolysis of Ammonia Borane as a Hydrogen Source: Fundamental Issues and Potential Solutions Towards Implementation

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THE STRUCTURE OF H3NBH3

Cited by 90 publications

References 2 publications

Boron-11, boron-10, and nitrogen-14 NMR relaxation rates and quadrupole coupling constants in BH3NH3

Boron-11, boron-10, and nitrogen-14 NMR relaxation rates and quadrupole coupling constants in BH3NH3

Ammonia borane at high pressures

Hydrolysis of Ammonia Borane as a Hydrogen Source: Fundamental Issues and Potential Solutions Towards Implementation

Contact Info

Product

Resources

About

THE STRUCTURE OF H₃NBH₃

Boron-11, boron-10, and nitrogen-14 NMR relaxation rates and quadrupole coupling constants in BH₃NH₃

Boron-11, boron-10, and nitrogen-14 NMR relaxation rates and quadrupole coupling constants in BH₃NH₃