Complex of aluminum borohydride with calcium borohydride

Titov, L. V.; Eremin, E. R.

doi:10.1007/bf00922975

Cited by 9 publications

(13 citation statements)

References 2 publications

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“…However, the [Al(BH 4 ) 4 ] -anion is reported to exist. 41 Thus, either the anion is misformulated or the coordinative interactions of the complex ion is very different from those that we have elucidated for LiSc(BH 4 ) 4 . P-42c, a ) 6.0759(1), c ) 12.0338(1 a Note: The displacement parameter of lithium atom refined to very high values and was therefore fixed in the final refinement.…”

Section: Discussioncontrasting

confidence: 56%

LiSc(BH₄)₄: A Novel Salt of Li⁺ and Discrete Sc(BH₄)₄⁻ Complex Anions

et al. 2008

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LiSc(BH 4 ) 4 has been prepared by ball milling of LiBH 4 and ScCl 3 . Vibrational spectroscopy indicates the presence of discrete Sc(BH 4 ) 4 -ions. DFT calculations of this isolated complex ion confirm that it is a stable complex, and the calculated vibrational spectra agree well with the experimental ones. The four BH 4 -groups are oriented with a tilted plane of three hydrogen atoms directed to the central Sc ion, resulting in a global 8 + 4 coordination. The crystal structure obtained by high-resolution synchrotron powder diffraction reveals a tetragonal unit cell with a ) 6.076 Å and c ) 12.034 Å (space group P-42c). The local structure of the Sc(BH 4 ) 4 -complex is refined as a distorted form of the theoretical structure. The Li ions are found to be disordered along the z axis.

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Section: Discussioncontrasting

confidence: 56%

LiSc(BH₄)₄: A Novel Salt of Li⁺ and Discrete Sc(BH₄)₄⁻ Complex Anions

et al. 2008

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“…The complex cation [(BH 4 )Li 4 ] 3 + is important in understanding the unexpected Al 3 Li 4 A C H T U N G T R E N N U N G (BH 4 ) 13 stoichiometry, relative to other double-cation borohydrides, such as LiKA C H T U N G T R E N N U N G (BH 4 ) 2 , [8] LiScA C H T U N G T R E N N U N G (BH 4 ) 4 [9] and NaSc-…”

Section: Resultsmentioning

confidence: 99%

“…Replacement of the Sc 3 + cation by Al 3 + in LiScA C H T U N G T R E N N U N G (BH 4 ) 4 was discussed in reference [9] and the existence of the [AlA C H T U N G T R E N N U N G (BH 4 ) 4 ] À anion was claimed in reference [13]. A double-cation borohydride LiAlA C H T U N G T R E N N U N G (BH 4 ) 4 was suggested as a product of the reaction between lithium and aluminium borohydride in ether solutions; [14] however, no structural details were reported.…”

Section: Introductionmentioning

confidence: 98%

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Al₃Li₄(BH₄)₁₃: A Complex Double‐Cation Borohydride with a New Structure

Lindemann

Ferrer

Dunsch

et al. 2010

Chemistry A European J

110

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The new double-cation Al-Li-borohydride is an attractive candidate material for hydrogen storage due to a very low hydrogen desorption temperature (approximately 70 degrees C) combined with a high hydrogen density (17.2 wt%). It was synthesised by high-energy ball milling of AlCl(3) and LiBH(4). The structure of the compound was determined from image-plate synchrotron powder diffraction supported by DFT calculations. The material shows a unique 3D framework structure within the borohydrides (space group=P-43n, a=11.3640(3) A). The unexpected composition Al(3)Li(4)(BH(4))(13) can be rationalized on the basis of a complex cation [(BH(4))Li(4)](3+) and a complex anion [Al(BH(4))(4)](-). The refinements from synchrotron powder diffraction of different samples revealed the presence of limited amounts of chloride ions replacing the borohydride on one site. In situ Raman spectroscopy, differential scanning calorimetry (DSC), thermogravimetry (TG) and thermal desorption measurements were used to study the decomposition pathway of the compound. Al-Li-borohydride decomposes at approximately 70 degrees C, forming LiBH(4). The high mass loss of about 20 % during the decomposition indicates the release of not only hydrogen but also diborane.

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“…[94]. In addition, there are several other M(BH 4 ) n (e.g., M = Zn, Al, Ti, Mn and Zr) [95][96][97][98][99][100][101][102][103]. Most of these were found to be irreversible due to their low melting temperatures and the release of diborane with hydrogen.…”

Section: Fundamentals Of Hydrogen Storage Propertiesmentioning

confidence: 99%

Recent Progress in Metal Borohydrides for Hydrogen Storage

et al. 2011

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Abstract:The prerequisite for widespread use of hydrogen as an energy carrier is the development of new materials that can safely store it at high gravimetric and volumetric densities. Metal borohydrides M(BH 4 ) n (n is the valence of metal M), in particular, have high hydrogen density, and are therefore regarded as one such potential hydrogen storage material. For fuel cell vehicles, the goal for on-board storage systems is to achieve reversible store at high density but moderate temperature and hydrogen pressure. To this end, a large amount of effort has been devoted to improvements in their thermodynamic and kinetic aspects. This review provides an overview of recent research activity on various M(BH 4 ) n , with a focus on the fundamental dehydrogenation and rehydrogenation properties and on providing guidance for material design in terms of tailoring thermodynamics and promoting kinetics for hydrogen storage.

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Complex of aluminum borohydride with calcium borohydride

Cited by 9 publications

References 2 publications

LiSc(BH₄)₄: A Novel Salt of Li⁺ and Discrete Sc(BH₄)₄⁻ Complex Anions

LiSc(BH₄)₄: A Novel Salt of Li⁺ and Discrete Sc(BH₄)₄⁻ Complex Anions

Al₃Li₄(BH₄)₁₃: A Complex Double‐Cation Borohydride with a New Structure

Recent Progress in Metal Borohydrides for Hydrogen Storage

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Complex of aluminum borohydride with calcium borohydride

Cited by 9 publications

References 2 publications

LiSc(BH4)4: A Novel Salt of Li+ and Discrete Sc(BH4)4− Complex Anions

LiSc(BH4)4: A Novel Salt of Li+ and Discrete Sc(BH4)4− Complex Anions

Al3Li4(BH4)13: A Complex Double‐Cation Borohydride with a New Structure

Recent Progress in Metal Borohydrides for Hydrogen Storage

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LiSc(BH₄)₄: A Novel Salt of Li⁺ and Discrete Sc(BH₄)₄⁻ Complex Anions

LiSc(BH₄)₄: A Novel Salt of Li⁺ and Discrete Sc(BH₄)₄⁻ Complex Anions

Al₃Li₄(BH₄)₁₃: A Complex Double‐Cation Borohydride with a New Structure