Dissolving the ternary material K 6 Rb 6 Si 17 together with chelating ligands such as 18-crown-6 (1,4,7,10,13,16-hexaoxacyclooctadecane), dibenzo-18-crown-6 (2,3,11,12-dibenzo-1,4,7,10,13,16-hexaoxacyclooctadecane) ]Rb 3 Si 9 ·4NH 3 . Single-crystal X-ray diffraction analysis reveals the presence of Si 9 4-anions, the existence of which in solution has been a matter of discussion until now. In both compounds, the Si 9 4-cages display slightly
The new compounds K4Ge9 ·9 NH3 and Rb4Ge9 ·5 NH3 were prepared by the extraction of K4Ge9 and Rb4Ge9 with liquid ammonia and characterized by low temperature X-ray structure analysis. They both contain monocapped square antiprismatic Ge94− anions. Cs6Ge18 ·4 NH3 was prepared by the extraction of K2Cs2Ge9 with liquid ammonia in the presence of [(Bu)3MeN](Br2I) as an oxidizing agent, and contains a [Ge9-Ge9]6− dimer in which two Ge94− anions are linked by a single Ge-Ge bond
The dissolution of the ternary material K 6 Rb 6 Si 17 in liquid ammonia yields the solvate compound Rb 4 Si 9 · 5NH 3 , which contains fourfold negatively charged nine atom silicon clusters
Germanium I 4700 Synthesis and Crystal Structures of the Polygermanide Ammoniates K 4 Ge 9 ·9NH 3 , Rb4Ge9·5NH3 and Cs6Ge18·4NH3. -The structures of the new polygermanides (III) (orthorhombic, space group Pnma, Z = 4), (V) (monoclinic, P21/c, Z = 4), and (VII) (monoclinic, P21/n, Z = 2) are determined by low-temperature (123 K) XRD. -(SUCHENTRUNK, C.; DANIELS, J.; SOMER, M.; CARRILLO-CABRERA, W.; KORBER*, N.; Z. Naturforsch., B: Chem. Sci. 60 (2005) 3, 277-283; Inst. Anorg. Chem., Univ. Regensburg, D-93053 Regensburg, Germany; Eng.) -Schramke 23-018
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