ChemInform Abstract: Alkali Metal Nitrido Tecto Metalates(VI) with Networks of Six‐Membered Rings of Corner‐Sharing Tetrahedra [(MNN_3/2)₆] with M: Mo, W of the Unexpected Composition A_9+x[M₆N₁₅] with A: Rb, Cs, and 0 < x < 1.

Abstract

structure structure (solids and liquids) D 2000 25 -006 Alkali Metal Nitrido Tecto Metalates(VI) with Networks of Six-Membered Rings of Corner-Sharing Tetrahedra [(MNN 3/2 ) 6 ] with M: Mo, W of the Unexpected Composition A 9+x [M 6 N 15 ] with A: Rb, Cs, and 0 ¡ x ¡ 1. -Rb 9+x [M 6 N 15 ] and Cs 9+x [M 6 N 15 ] with M: Mo, W and 0 ¡ x ¡ 1 are prepared by reaction of Mo or W metal powder with mixtures of RbNH 2 (CsNH 2 ) and RbN 3 (CsN 3 ) (autoclave, 650 • C, 5 d). The isotypic compounds crystallize in space group R3c with Z = 6. The metal centers of MN 4 tetrahedra are connected to six-membered rings in chair-conformation via N atoms. The rings are linked by axial N atoms to form a three-dimensional network. Nine alkali metal ions are located within vacancies of the anionic partial structure and the residual x alkali metal ions center the six-membered rings. -(STEGEN, H.; JACOBS, H.; Z. Anorg. Allg. Chem. 626 (2000) 3, 639-644; Lehrstuhl Anorg. Chem., Univ. Dortmund, D-44221 Dortmund, Germany; DE)