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Ammine Magnesium Borohydride Complex as a New Material for Hydrogen Storage: Structure and Properties of Mg(BH4)2·2NH3
Abstract
The ammonia complex of magnesium borohydride Mg(BH4)2.2NH3 (I), which contains 16.0 wt % hydrogen, is a potentially promising material for hydrogen storage. This complex was synthesized by thermal decomposition of a hexaaammine complex Mg(BH4)2.6NH3 (II), which crystallizes in the cubic space group Fm3 m with unit cell parameter a=10.82(1) A and is isostructural to Mg(NH3) 6Cl2. We solved the structure of I that crystallizes in the orthorhombic space group Pcab with unit cell parameters a=17.4872(4) A, b=9.4132(2) A, c=8.7304(2) A, and Z=8. This structure is built from individual pseudotetrahedral molecules Mg(BH4)2.2NH3 containing one bidentate BH4 group and one tridentate BH4 group that pack into a layered crystal structure mediated by N-H...H-B dihydrogen bonds. Complex I decomposes endothermically starting at 150 degrees C, with a maximum hydrogen release rate at 205 degrees C, which makes it competitive with ammonia borane BH 3NH3 as a hydrogen storage material.
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Citations
Cited by
Advanced Materials for Energy Storage
Liu, C., Li, F., Ma, L., & Cheng, H. (2010) · Advanced Materials · doi:10.1002/adma.200903328 · Cited by 4,765
B–N compounds for chemical hydrogenstorage
Hamilton, C. W., Baker, R. T., Staubitz, A., & Manners, I. (2009) · Chem. Soc. Rev. · doi:10.1039/b800312m · Cited by 1,087
Yu, X., Tang, Z., Sun, D., Ouyang, L., & Zhu, M. (2017) · Progress in Materials Science · doi:10.1016/j.pmatsci.2017.03.001 · Cited by 716
Hydrogen Storage Materials for Mobile and Stationary Applications: Current State of the Art
Lai, Q., Paskevicius, M., Sheppard, D. A., Buckley, C. E., Thornton, A. W., Hill, M. R., Gu, Q., Mao, J., Huang, Z., Liu, H. K., et al. (2015) · ChemSusChem · doi:10.1002/cssc.201500231 · Cited by 414
Metal borohydrides and derivatives – synthesis, structure and properties
Paskevicius, M., Jepsen, L. H., Schouwink, P., Černý, R., Ravnsbæk, D. B., Filinchuk, Y., Dornheim, M., Besenbacher, F., & Jensen, T. R. (2017) · Chemical Society Reviews · doi:10.1039/c6cs00705h · Cited by 406
Metadata
- Authors
- Soloveichik, G., Her, J.-H., Stephens, P. W., Gao, Y., Rijssenbeek, J., Andrus, M., & Zhao, J.-C.
- Venue
- Inorganic Chemistry
- Publisher
- American Chemical Society (ACS)
- Published
- 2008-04-23
- Volume
- 47
- Issue
- 10
- Pages
- 4290-4298
- ISSN
- 0020-1669 (ISSN-L)
- 1520-510X
- OpenAlex
- W2034748181
- Cited by
- 223
- References
- 0
- FWCI
- 8.08
- Type
- journal article
- Language
- en
- Open access
- closed
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