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The heptaarsanes(3) As 7 (Mme 3 ) 3  (M = Si, Ge, Sn) with nortricyclene structure have been synthesized by heterogeneous and homogeneous reactions from K 3 As 7  and Rb 3 As 7 , respectively, with Mme 3 Cl. The crystal structures have been determined. The compounds are isotypic and crystallize in unit cells of R3̄̄ symmetry, containing pairs of enantiomers. The bond lengths d(As-As) in the nortricyclene skeleton are nearly uneffected by the substituents and show the sequence typical for covalent nortricyclenes: d(basal) = 244.3 pm &gt; d(basal-equatorial) = 242.7 pm &gt; d(equatorial-apical) = 240.7 pm (mean values). The spread-off of the Mme, substituents decreases as going from P 7  to As 7  skeletons as well as with increasing size of M

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Substituierte Heptaarsane(3) As 7 (Mme 3 ) 3  (M = Si, Ge, Sn) mit Nortricyclenstruktur / Substituted Heptaarsanes(3) As 7 (Mme 3 ) 3  (M = Si, Ge, Sn) with Nortricyelene Structure