Tris[(1,4,7,10,13,16-hexa-oxacyclo-octa-deca-ne)rubidium] heptaantimonide-ammonia (1/4)

Abstract

The crystal structure of the title compound, [Rb(C12H24O6)]3[Sb7]·4NH3, fills the gap between the already known Zintl anion ammoniates 2·9NH3 [Wiesler (2007). Dissertation, Universität Regensburg, Germany] and [K(18-crown-6)]3Sb7·4NH3 [Hanauer (2007). Dissertation, Universität Regensburg, Germany]. As in the two known compounds, the antimony cage anion in this crystal structure is coordinated by three alkali cations. The coordination spheres of each of the cations are saturated by 18-crown-6 molecules. The ammonia molecules of crystallization are situated between the crown ethers. The neutral, molecular [Rb(18-crown-6)]3Sb7 units are interconnected by multiple dipole-dipole interactions between ammonia and 18-crown-6.