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http://dx.doi.org/10.18419/opus-14170
Autor(en): | Bäucker, Christian Niewa, Rainer |
Titel: | A new modification of Rb[Al(NH2)4] and condensation in solid state |
Erscheinungsdatum: | 2020 |
Dokumentart: | Zeitschriftenartikel |
Seiten: | 12 |
Erschienen in: | Crystals 10 (2020), No. 1018 |
URI: | http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-ds-141896 http://elib.uni-stuttgart.de/handle/11682/14189 http://dx.doi.org/10.18419/opus-14170 |
ISSN: | 2073-4352 |
Zusammenfassung: | A new modification of Rb[Al(NH2)4] in space group C2/c, which differs from the known structural modification in the way the [Al(NH2)4]−-tetrahedra are arranged in the surrounding area of the rubidium cation, was obtained from ammonothermal synthesis at 673 K and 680 bar. The crystal structure was determined by Rietveld refinements and further investigated by infrared and Raman spectroscopy. Thermal gravimetric investigations indicate two decomposition steps up to 450 °C, which can be assigned to ammonia leaving the material while the sample liquefies. During the third and final step, volatile rubidium amide is released, leaving nano-scaled cubic AlN behind. Investigating differently aged samples implies decomposition and condensation of amidoaluminate ions already at ambient temperature, which is supported by refinements of single crystal X-ray diffraction data, revealing lower nitrogen amounts than expected. The observed single crystal also exhibits a significantly smaller volume than the reported structures, further supporting the decomposition-condensation mechanism. |
Enthalten in den Sammlungen: | 03 Fakultät Chemie |
Dateien zu dieser Ressource:
Datei | Beschreibung | Größe | Format | |
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crystals-10-01018-v2.pdf | 2,83 MB | Adobe PDF | Öffnen/Anzeigen |
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