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- W2019306043 abstract "Durch Umsetzung von Lithium und Aluminium mit flüssigem Ammoniak bei 80–100°C entsteht innerhalb weniger Tage LiAl(NH2)4. Kristalle für eine röntgenographische Strukturbestimmung erhält man bei langsamen Wachstum aus flüssigem NH3 ausgehend von feinteiligem ternären Amid. Die Aufklärung der Atomanordnung gelang einschließlich der H-Lagenbestimmung an den NH2−-Ionen. Raumgruppe: P21/n; Gitterkonstanten: a = 9,478(1) Å, b = 7,351(1) Å, c = 7,398(1) Å, β = 90,26(1)°; Z = 4, R-Werte (ungew./gew. mit w = 1): 0,042/0,046. Die Atomanordnung von LiAl(NH2)4 kann formal als eine neue Variante der GaPS4-Struktur aufgefaßt werden. Die Verbindung wird weiterhin durch ihr IR-Spektrum charakterisiert. Bei der thermischen Zersetzung von LiAl(NH2)4 bildet sich bei 180°C amorphes Al2(NH)3 neben gut kristallinem LiNH2; bei 220°C liegt bereits feinteiliges AlN vor. Oberhalb 400°C reagiert dieses AlN mit LiNH2 bzw. Li2NH zu Li3AlN2. Lithium Aluminium Amide, LiAl(NH2)4-Preparation, X-Ray Investigation, I.R.Spectrum, and Thermal Decomposition The reaction of lithium and aluminium with liquid ammonia gives LiAl(NH2)4 within some days at temperatures from 80–100°C. Crystals for an X-ray structure determination must be grown very slowly from liquid NH3 starting with thoroughly pulverized amide. The structure analysis was successful including the determination of the positions of the hydrogen atoms of the amide ions. Space group: P21/n; lattice constants: a = 9.478(1) Å, b = 7.351(1) Å, c = 7.398(1) Å, β = 90.26(1)°; Z = 4, R-values (unweighted, weighted with w = 1): 0.042/0.046. The atomic arrangement of LiAl(NH2)4 can formally be described as a new variant of the GaPS4-type structure. The compound is characterized too by its i.r. spectrum. The thermal degradation of LiAl(NH2)4 gives at 180°C amorphous Al2(NH)3 and crystalline LiNH2; at 220°C results already very fine AlN. Above 400°C this AlN reacts with LiNH2 or Li2NH forming Li3AlN2." @default.
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- W2019306043 title "Lithiumaluminiumamid, LiAl(NH2)4, Darstellung, r�ntgenographische Untersuchung, Infrarotspektrum und thermische Zersetzung" @default.
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- W2019306043 doi "https://doi.org/10.1002/zaac.19855311218" @default.
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