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Using 293 K diffractometer intensity data, the structures of [H 3 N(CH 2 ) 3 NH 3 ]TeCl 6  and [H 3 N(CH 2 ) 3 NH 3 ]SnCl 6  have been determined by single crystal X-ray technique and refined to a final of 0.027 and 0,029, respectively. The yellow crystals of the tellurate are orthorhombic (space group Pnma) with a = 22.952(2), b = 7.5414(4), c - 7.801(1) Å and Z = 4. This structure contains distorted TeCl 6  2-  octahedra (distances Te - Cl min. 2.426(1), max. 2.672(1) Å ) with approximate 2mm point symmetry. In contrast, the SnCl 6  2-  ion in the second title com pound is octahedral with only small deviations from m 3m symmetry (distances Sn -Cl mean: 2.438(3) Ä ). The colourless crystals of this tin com pound are orthorhombic (space group Pnma) with a - 17.6082(9), b = 7.1809(3), c = 10.190(1) Å and Z = 4. Considering the TeX 6  2-  (X = Cl, Br, I) salts known to date, a distorted species is an exception, although a distortion is predicted by the VSEPR theory. The results agree with the rules for the appearance of a static stereochemical effect of the lone pair electrons in the TeX 6  2-  species

zeitschrift für naturforschung b

Zur Stereochemie des freien Elektronenpaares in Verbindungen des vierwertigen Tellurs: Verzerrtes TeCI 6  2- Oktaeder in [H 3 N(CH 2 ) 3 NH 3 TeCI 6  regulär oktaedrisches Anion in  H 3 N(CH 2 ) 3 NH 3 SnCI 6  / On the Stereochemistry of Lone Pair Electrons in Compounds with Tetravalent Tellurium: Distorted TeCl 6  2- Octahedron in [H 3 N(CH 2 ) 3 NH 3 ]TeCl 6 , Regular Octahedral Anion in [H 3 N(CH 2 ) 3 NH 3 ]SnCl 6