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TeI 3 [AsF 6 ] is formed from Te, I 2 , and AsF 5  in liquid SO 2 . At room temperature light red crystals of the hemi SO 2  solvate TeI 3 [AsF 6 ] · 0.5 SO 2  are obtained from a saturated solution. The crystal structure (orthorhombic, Pnnm, a=1107.41(2), b=1866.58(3), c=1207.00(2) pm at 123 K, Z =8) consists of pyramidal TeI 3  +  cations (Te-I = 267 pm), almost regular octahedral [AsF 6 ] −  anions and of SO 2  molecules which show disorder for the O atom positions. A remarkable feature of the crystal structure is the arrangement of the TeI 3  +  ions that are pairwise associated, facing each other with the I atoms and forming large voids between each other. This causes the significantly lower density of TeI 3 [AsF 6 ] · 0.5 SO 2  (3.88 Mgm −3 ) in comparison to the unsolvated form (4.20 Mgm −3 , Pass more 1981).

zeitschrift für naturforschung b

Triiodotelluronium Hexafluoroarsenate TeI 3 [AsF 6 ]. The Crystal Structure of the Hemi SO 2  Solvate and the Structure Relation to the Unsolvated Form