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The preparation and spectroscopic data of the new ternary amide LiAl(NHCH 3 ) 4  are reported. The structure of the title compound has been determined from X-ray powder diffraction data (tetragonal, 14 1 , a = 14.000(4) Å, c = 9.275(2) Å, 210 reflections, R = 3.75%, weighted R = 5.10%). Both the lithium and the aluminium atoms are coordinated tetrahedrally by nitrogen atoms. Edge-sharing pairs of lithium centered and aluminium centered tetrahedra are connected to each other in helical chains forming a 3D-framework via the remaining vertices. A comparison of the projection of the crystal structure of LiAl(NHCH 3 ) 4  along the c-axis to those of cristobalite and of hollandite, (Ba,K) 2  (Mn,Fe) 8 O 16 , reveals similarities with respect to both the connectivity and the topology of ring structures.

zeitschrift für naturforschung b

Darstellung und Strukturanalyse von Lithium- [tetrakis-(methylamino-)aluminat] /  Preparation and Crystal Structure of Lithium[tetrakis-(methylamino-)aluminate]