Neubestimmung von Struktur und Eigenschaften isotyper Natriumtetraamidometallate des Aluminiums und Galliums

Redetermination of Structure and Properties of the Isotypic Sodium Tetraamido Metallates of Aluminium and Gallium Crystals for x-ray structure determination of NaAl(NH₂)₄ and NaGa(NH₂)₄ were obtained by the reaction of the metals with ammonia in autoclaves at 100°C and P(NH₃) = 60 bar within 7 days. The compounds crystallize isotypic in the space group P2₁/c with Z = 4 NaAl(NH₂)₄ a = 7.328(2) Å, b = 6.047(2) Å, c = 13.151(3) Å, β = 94.04(1)° NaGa(NH₂)₄ a = 7.4087(8) Å, b = 6.0917(5) Å, c = 12.855(2) Å, β = 92.10(1)° The structures were refined inclusively all H-positions of the amide ions. The ternay amides are furthermore characterized by their IR spectra and their thermal behaviour.