Synthesis, Structural Characterization, and Hydrogen Release of Al-Based Amidoboranes Derived from MAlH<sub>4</sub> (Li, Na)-BH<sub>3</sub>NH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>NH<sub>2</sub>BH<sub>3</sub>
Over the past two decades, the high hydrogen content and favorable dehydrogenation conditions of multi-metallic amidoboranes have gained significant attention for their potential in hydrogen storage. Among them, Al-based complex hydrides have shown promise because of their high polarizing power, lig...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2025-03-01
|
| Series: | Molecules |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1420-3049/30/7/1559 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | Over the past two decades, the high hydrogen content and favorable dehydrogenation conditions of multi-metallic amidoboranes have gained significant attention for their potential in hydrogen storage. Among them, Al-based complex hydrides have shown promise because of their high polarizing power, light weight, and abundant natural presence. In this work, we successfully synthesized two novel tetrahedrally coordinated Al-based amidoboranes, namely, Li[Al(BH<sub>3</sub>NHCH<sub>2</sub>CH<sub>2</sub>NHBH<sub>3</sub>)<sub>2</sub>] and Na(THF)[Al(BH<sub>3</sub>NHCH<sub>2</sub>CH<sub>2</sub>NHBH<sub>3</sub>)<sub>2</sub>], using BH<sub>3</sub>NH<sub>2</sub>CH<sub>2</sub>CH<sub>2</sub>NH<sub>2</sub>BH<sub>3</sub> (EDAB) as a precursor. The structure of Na(THF)[Al(BH<sub>3</sub>NHCH<sub>2</sub>CH<sub>2</sub>NHBH<sub>3</sub>)<sub>2</sub>] was determined through modeling based on synchrotron powder X-ray diffraction. Additionally, the formation of the Al-N bond in Li[Al(BH<sub>3</sub>NHCH<sub>2</sub>CH<sub>2</sub>NHBH<sub>3</sub>)<sub>2</sub>] and Na(THF)[Al(BH<sub>3</sub>NHCH<sub>2</sub>CH<sub>2</sub>NHBH<sub>3</sub>)<sub>2</sub>] was confirmed with IR spectra. Na(THF)[Al(BH<sub>3</sub>NHCH<sub>2</sub>CH<sub>2</sub>NHBH<sub>3</sub>)<sub>2</sub>] is more stable in air than Li[Al(BH<sub>3</sub>NHCH<sub>2</sub>CH<sub>2</sub>NHBH<sub>3</sub>)<sub>2</sub>]. Importantly, thermal gravimetric analysis and mass spectroscopic characterization confirmed that both compounds release hydrogen without the presence of ammonia, diborane, or ethylenediamine. Our work represents the first example of Al-based amidoboranes with chelation coordination geometry, which provides an essential foundation for understanding the relationship of complex multi-metallic amidoboranes in terms of synthesis, structure, and properties. |
|---|---|
| ISSN: | 1420-3049 |