Cs₅Sn₉(OH)·4NH₃

The title compound, penta­caesium nona­stannide hydroxide tetra­ammonia, crystallized from a solution of CsSnBi in liquid ammonia. The Sn₉^4- unit forms a monocapped quadratic anti­prism. The hydroxide ion is surrounded by five caesium cations, which form a distorted quadratic pyramidal polyhedron. A three-dimensional network is formed by Cs-Sn [3.8881 (7) Å to 4.5284 (7) Å] and Cs-NH₃ [3.276 (7)-3.636 (7) Å] contacts.

(18-Crown-6)potassium(I) di­phenyl­stibate(−1)

Red crystals of the title salt, [K(C₁₂H₂₄O₆)][Sb(C₆H₅)₂], were obtained by the reaction of SbPh₃, KSnBi and 18-crown-6 in liquid ammonia. The asymmetric unit contains one half of a [K(18-crown-6)]⁺ cation and one half of an SbPh₂⁻ anion, with the central element lying on a twofold axis and a centre of inversion, respectively. In the crystal structure, the sequestered potassium cations show weak inter­actions with the π-electrons of the phenyl groups of the SbPh₂⁻ anion [shortest K...C distances = 3.190 (2) and 3.441 (2) Å], leading to one-dimensional strands along the crystallographic c axis. These strands are aligned in a pseudo-hexa­gonal packing perpendicular to the ab plane.