The crystal structure of β-dimethyltellurium di-iodide

Abstract

Crystals of β-dimethyltellurium di-iodide are monoclinic, a= 8·12, b= 19·30, c= 10·58 Å, β= 103·3°, Z= 8(Me₂Tel₂), space-group P2₁/c. The structure was determined with Mo–K_α counter data, the final R being 0·09 for 1200 observed reflexions. The crystal is ionic, [Me₃Te]⁺[MeTel₄]^–, and is built up from trigonal pyramidal Me₃Te⁺ cations with Te–C = 2·07 Å, ∠ C–Te–C = 95°, and square pyramidal MeTel₄^– anions with Te–C = 2·15 Å, Te–l = 2·84–2·98 Å. The ions are bridged by four weak Te ⋯ l interactions (distances 3·84, 3·88, 3·97, 4·00 Å), which complete a distorted octahedral environment around each tellurium atom.