Biliškov, Nikola; Borgschulte, Andreas; Užarević, Krunoslav; Halasz, Ivan; Lukin, Stipe; Milošević, Sanja; Milanović, Igor; Novaković, Jasmina Grbović (2017) In-Situ and Real-time Monitoring of Mechanochemical Preparation of Li2 Mg(NH2 BH3 )4 and Na2 Mg(NH2 BH3 )4 and Their Thermal Dehydrogenation. Chemistry - A European Journal, 23 (64). pp. 16274-16282. ISSN 0947-6539
|
PDF
- Accepted Version
- article
Download (2MB) | Preview |
|
|
PDF
- Submitted Version
- article
Download (5MB) | Preview |
Abstract
For the first time, in-situ monitoring of uninterrupted mechanochemical synthesis of two bimetallic amidoboranes, M2Mg(NH2BH3)4 (M = Li, Na), by means of Raman spectroscopy has been applied. This approach allowed real-time observation of key intermediate phases and a straightforward follow-up of the reaction course. Detailed analysis of time-dependent spectra revealed a two-step mechanism through MNH2BH3.NH3BH3 adducts as key intermediate phases which further reacted with MgH2, giving M2Mg(NH2BH3)4 as final products. The intermediates partially take a competitive pathway toward the oligomeric M(BH3NH2BH2NH2BH3) phases. The crystal structure of the novel bimetallic amidoborane Li2Mg(NH2BH3)4 was solved from high-resolution powder diffraction data and showed an analogous metal coordination as in Na2Mg(NH2BH3)4, but a significantly different crystal packing. Li2Mg(NH2BH3)4 thermally dehydrogenates releasing highly pure H2 in the amount of 7 wt% and at a lower temperature then its sodium analogue making it significantly more viable for practical applications.
| Item Type: | Article | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Uncontrolled Keywords: | hydrogen storage; amidoborane; Raman spectroscopy; ammonia borane; mechanochemistry | ||||||||
| Subjects: | NATURAL SCIENCES NATURAL SCIENCES > Chemistry NATURAL SCIENCES > Chemistry > Inorganic Chemistry |
||||||||
| Divisions: | Division of Materials Chemistry | ||||||||
| Projects: |
|
||||||||
| Depositing User: | Nikola Biliškov | ||||||||
| Date Deposited: | 19 Dec 2017 11:06 | ||||||||
| URI: | http://fulir.irb.hr/id/eprint/3798 | ||||||||
| DOI: | 10.1002/chem.201702665 |
Actions (login required)
 |
View Item |
Altmetric
Altmetric
