Cyclische Phosphidostannat(III)-Anionen [Sn12P24]36– in Sr3[Sn2P4]

Cyclic Phosphidostannate(III) Anions Sn₁₂P₂₄]^36– in Sr₃Sn₂P₄] The metallic lustrous, air sensitive compound Sr₃Sn₂P₄] was prepared from melts of mixtures of the elements. Sr₃Sn₂P₄] crystallizes in the orthorhombic system, space group Cmca (a = 2510,4(9), b = 1259,3(6), c = 1869,3(8), Z = 24). In the anionic partial structure six moieties Sn₂P₆] isostructural to Si₂Cl₆ are linked by each four common P-ligands forming cyclic units Sn₁₂P₂₄]^36–. The strontium cations are octahedrally coordinated by P. The arrangement can be described as a distorted cubic close packing of P^3– in which in an ordered manner ³/₄ of the octahedral vacancies are occupied by Sr²⁺ and ¹/₄ by Sn₂-dumbbells.