The Preparation and Properties of Hexamminecobalt(III) Borohydride, Hexamminechromium(III) Borohydride and Ammonium Borhydride<sup>1</sup>

Parry, R. W.; Schultz, D. R.; Girardot, Peter R.

doi:10.1021/ja01534a001

Cited by 90 publications

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“…It should be noted that usually such compounds are not stable enough because of their tendency to the spontaneous liberation of hydrogen. Accordingly, the precursor to ammonia-borane -ammonium borohydride (NH 4 BH 4 ) decomposes at temperatures above À40°C to give H 2 and has a halflife of about 6 h at room temperature [12,13]. However, the given compound 1 is not able to form dihydrogen, because the negative charged hydride ion is not presented in the structure of DHB.…”

Section: Characterizing B-há á áH-n Dihydrogen Bond Systems With the mentioning

confidence: 99%

Experimental and theoretical treatment of hydrogen splitting and storage in boron–nitrogen systems

Sumerin

Schulz

Nieger

et al. 2009

Journal of Organometallic Chemistry

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Section: Characterizing B-há á áH-n Dihydrogen Bond Systems With the mentioning

confidence: 99%

Experimental and theoretical treatment of hydrogen splitting and storage in boron–nitrogen systems

Sumerin

Schulz

Nieger

et al. 2009

Journal of Organometallic Chemistry

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“…Another example is ammonium borohydride [NH 4 ][BH 4 ] with 24.6 wt. % H, but it is unstable dehydrogenating to AB at sub-zero temperatures [5].…”

Section: Introductionmentioning

confidence: 99%

In situ Synchrotron X-ray Thermodiffraction of Boranes

2016

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Abstract:Boranes of low molecular weight are crystalline materials that have been much investigated over the past decade in the field of chemical hydrogen storage. In the present work, six of them have been selected to be studied by in situ synchrotron X-ray thermodiffraction. The selected boranes are ammonia borane NH 3 BH 3 (AB), hydrazine borane N 2 H 4 BH 3 (HB), hydrazine bisborane N 2 H 4 (BH 3 ) 2 (HBB), lithium LiN 2 H 3 BH 3 (LiHB) and sodium NaN 2 H 3 BH 3 (NaHB) hydrazinidoboranes, and sodium triborane NaB 3 H 8 (STB). They are first investigated separately over a wide range of temperature (80-300 K), and subsequently compared. Differences in crystal structures, the existence of phase transition, evolutions of unit cell parameters and volumes, and variation of coefficients of thermal expansion can be observed. With respect to AB, HB and HBB, the differences are mainly explained in terms of molecule size, conformation and motion (degree of freedom) of the chemical groups (NH 3 , N 2 H 4 , BH 3 ). With respect to LiHB, NaHB and STB, the differences are explained by a stabilization effect favored by the alkali cations via M¨¨¨H interactions with four to five borane anions. The main results are presented and discussed herein.

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“…[2][3][4][5] Several research directions are being explored, but there is no definite solution to the high temperature hydrogen desorption and irreversibility problems associated with these compounds. Ammonium borohydride, NH 4 BH 4 , has the highest gravimetric hydrogen density, 24.523 wt%, yet although it was first synthesized more than 50 years ago, 6 its structure and properties are only now being fully explored. The reported instability above −40 °C perhaps put this potential H-storage material out of the research focus.…”

mentioning

confidence: 99%

Structure and dynamics of ammonium borohydride

et al. 2010

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The Preparation and Properties of Hexamminecobalt(III) Borohydride, Hexamminechromium(III) Borohydride and Ammonium Borhydride¹

Cited by 90 publications

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Experimental and theoretical treatment of hydrogen splitting and storage in boron–nitrogen systems

Experimental and theoretical treatment of hydrogen splitting and storage in boron–nitrogen systems

In situ Synchrotron X-ray Thermodiffraction of Boranes

Structure and dynamics of ammonium borohydride

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The Preparation and Properties of Hexamminecobalt(III) Borohydride, Hexamminechromium(III) Borohydride and Ammonium Borhydride1

Cited by 90 publications

References 0 publications

Experimental and theoretical treatment of hydrogen splitting and storage in boron–nitrogen systems

Experimental and theoretical treatment of hydrogen splitting and storage in boron–nitrogen systems

In situ Synchrotron X-ray Thermodiffraction of Boranes

Structure and dynamics of ammonium borohydride

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The Preparation and Properties of Hexamminecobalt(III) Borohydride, Hexamminechromium(III) Borohydride and Ammonium Borhydride¹