Finally Fulfilling Wade's Rules: The C_4v Symmetric Polycation Bi₉⁵⁺ in the Polar Structure of Bi₁₈Sn₇Br₂₄ = (Bi₉⁵⁺)₂[Sn₇Br₂₄^10–]

Bernhard Wahl (1) , Michael Ruck (2)

1 Fachrichtung Chemie und Lebensmittelchemie
2 Fachrichtung Chemie und Lebensmittelchemie

The bismuth-rich bromidostannate(II) Bi₁₈Sn₇Br₂₄ = (Bi₉⁵⁺)₂[Sn₇Br₂₄^10–] was crystallized from a melt of Bi, Sn and BiBr₃. X-ray diffraction on a single-crystal revealed a polar, tetragonal structure (space group I4cm, no. 108) with lattice parameters a = 1323.70(5) pm and c = 1816.86(8) pm at 110(5) K. In agreement with Wade's rules and quantum chemical calculations, the homonuclear nido-cluster Bi₉⁵⁺ is a mono-capped square antiprism (point group C_4v). The anions of the bromidostannate(II) groups mainly comply with the pseudosymmetry of the space group I4/mcm and thereby affect substantial disorder of the Sn^II cations.

Mots clés: Physical Sciences

Bernhard Wahl, Michael Ruck. Finally Fulfilling Wade's Rules: The C_4v Symmetric Polycation Bi₉⁵⁺ in the Polar Structure of Bi₁₈Sn₇Br₂₄ = (Bi₉⁵⁺)₂[Sn₇Br₂₄^10–]. Journal of Inorganic and General Chemistry / Zeitschrift für anorganische und allgemeine Chemie, 2009, 636 (2), pp.337. ⟨10.1002/zaac.200900314⟩. ⟨hal-00524117⟩