Metallo Borohydrides. I. Aluminum Borohydride

Schlesinger, H. I.; Sanderson, R. T.; Burg, Ariela

doi:10.1021/ja01869a037

Cited by 112 publications

(81 citation statements)

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“…From this point of view, it is important to carry out synthesis of new borohydrides by addition with other complex forming borohydrides, like Al(BH 4 ) 3 . 20 Herein we report on the synthesis, crystal structure, and Raman vibrational spectra together with thermal analysis of K[Al(BH 4 ) 4 ] which was first obtained by Semenenko et al 21 The synthesis was performed with liquid Al(BH 4 ) 3 and KBH 4 with the aim to prevent formation of possible halide-containing phases, common in case of metathesis reactions between borohydrides and halides. The crystal structure was determined by synchrotron powder diffraction, and further structural characterization was performed with Raman and IR spectroscopy.…”

Section: ■ Introductionmentioning

confidence: 99%

The First Halide-Free Bimetallic Aluminum Borohydride: Synthesis, Structure, Stability, and Decomposition Pathway

et al. 2013

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Interaction of solid KBH 4 with liquid Al(BH 4 ) 3 at room temperature yields a solid bimetallic borohydride KAl(BH 4 ) 4 . According to the synchrotron X-ray powder diffraction, its crystal structure (space group Fddd, a = 9.7405(3), b = 12.4500(4), and c = 14.6975(4) Å) contains a substantially distorted tetrahedral [Al(BH 4 ) 4 ]− anion, where the borohydride groups are coordinated to aluminum atoms via edges. The η -coordination of BH 4− is confirmed by the infrared and Raman spectroscopies. The title compound is the first aluminum-based borohydride complex not stabilized by halide anions or by bulky organic cations. It is not isostructural to bimetallic chlorides, where more regular tetrahedral AlCl 4 − anions are present. Instead, it is isomorphic to the LT phase of TbAsO 4 and can be also viewed as consisting of two interpenetrated dia-type nets where BH 4 ligand is bridging Al and K cations. Variable temperature X-ray powder diffraction, TGA, DSC, and TGA-MS data reveal a single step of decomposition at 160°C, with an evolution of hydrogen and some amount of diborane. Aluminum borohydride is not released in significant amounts; however, some crystalline KBH 4 forms upon decomposition. The higher decomposition temperature than in chloride-substituted Li−Al (70°C) and Na−Al (

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Section: ■ Introductionmentioning

confidence: 99%

The First Halide-Free Bimetallic Aluminum Borohydride: Synthesis, Structure, Stability, and Decomposition Pathway

et al. 2013

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“…As a consequence, several new tetrahydroborates were synthesized. Nowadays, the mono-cation tetrahydroborates of 32 chemical elements, plus an undefined number of multi-cation tetrahydroborates are known [23,38,[42][43][44][45][52][53][54][55][56][57][59][60][61][62][63][64][65][66][67][68][69][70][71][72][73][74][75][76][77][78].…”

Section: From Boron To Tetrahydroboratesmentioning

confidence: 99%

“…The most prominent RHC system based on tetrahydroborates is 2LiBH 4 + MgH 2 [134,135,157] According to the reaction (52), it has the reversible hydrogen storage capacity of 11.5 wt % and a theoretical reaction enthalpy of 46 kJ/mol H 2 , which implies a hydrogen equilibrium pressure of 1 bar at 170 • C [158]. 2LiBH 4 + MgH 2 2LiH + MgB 2 + 4H 2 (52) In the last decade this system has been thoroughly investigated with respect to reaction pathway, temperature and hydrogen pressure boundaries, microstructure, effect of additives on the reaction kinetics, and nanoconfinement [159][160][161][162][163][164][165][166][167][168][169][170][171][172][173].…”

Section: Libhmentioning

confidence: 99%

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Tetrahydroborates: Development and Potential as Hydrogen Storage Medium

et al. 2017

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Abstract:The use of fossil fuels as an energy supply becomes increasingly problematic from the point of view of both environmental emissions and energy sustainability. As an alternative, hydrogen is widely regarded as a key element for a potential energy solution. However, differently from fossil fuels such as oil, gas, and coal, the production of hydrogen requires energy. Alternative and intermittent renewable energy sources such as solar power, wind power, etc., present multiple advantages for the production of hydrogen. On the one hand, the renewable sources contribute to a remarkable reduction of pollutants released to the air and on the other hand, they significantly enhance the sustainability of energy supply. In addition, the storage of energy in form of hydrogen has a huge potential to balance an effective and synergetic utilization of renewable energy sources. In this regard, hydrogen storage technology is a key technology towards the practical application of hydrogen as "energy carrier". Among the methods available to store hydrogen, solid-state storage is the most attractive alternative from both the safety and the volumetric energy density points of view. Because of their appealing hydrogen content, complex hydrides and complex hydride-based systems have attracted considerable attention as potential energy vectors for mobile and stationary applications. In this review, the progresses made over the last century on the synthesis and development of tetrahydroborates and tetrahydroborate-based systems for hydrogen storage purposes are summarized.

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“…A request from the National Defense Research Committee (NDRC) to investigate the synthesis of volatile compounds of uranium having low molecular weight, but without the corrosive properties of UF6, led Schlesinger's group to extend the method of preparation of other metal borohydrides, such as aluminum and beryllium borohydride (26)(27)(28) (which happened to be the most volatile compounds of these metals), to uranium borohydride (eq 3-6) (29 …”

Section: World War II Research and Preparation Of Sodium Borohydride mentioning

confidence: 99%

Sixty Years of Hydride Reductions

Brown

Ramachandran

1996

ACS Symposium Series

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We are nearing the close of a century that witnessed unprecedented scientific and technological progress that was probably unimaginable even half a century ago. While the overall advancement of science and technology is phenomenal, in reality it has taken place over several generations, made possible by the untiring dedication of the scientists involved to their research. In fact, every decade achieved significant advances, permitting the next generation to move forward in their own pursuit of knowledge. Later developments might cause some of the work of the earlier workers to appear trivial. However, one can only admire the tenacity of the pioneers whose steadfastness has led us to where we are today.In chemistry, the invention and perfection of new sophisticated instruments and methodologies have facilitated the analysis of reaction intermediates and products. Newer industries catering to the needs of chemists have decreased the necessity of having to prepare many of the starting materials and reagents.

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Metallo Borohydrides. I. Aluminum Borohydride

Cited by 112 publications

References 0 publications

The First Halide-Free Bimetallic Aluminum Borohydride: Synthesis, Structure, Stability, and Decomposition Pathway

The First Halide-Free Bimetallic Aluminum Borohydride: Synthesis, Structure, Stability, and Decomposition Pathway

Tetrahydroborates: Development and Potential as Hydrogen Storage Medium

Sixty Years of Hydride Reductions

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