AbstractThe electron diffraction pattern of the vapor from a sample of SeCl4 has been recorded with a reservoir and nozzle temperature of about 175 °C. The gas jet was found to consist of SeCl2 (80%) and Cl2 (20%). The bond distance in SeCl2 is ra(Se-Cl) = 2.157(3) Å, the valence angle <ClSeCl = 99.6(5)°.
Festes SeF4 ist monomer und nicht – wie festes TeF4 – polymer. Die Unterschiede in den Bindungsverhältnissen können auf den jeweiligen Hybridisierungsgrad des Chalkogens zurückgeführt und im Sinne von sp3d‐ (SeF4, pseudo‐trigonal‐bipyramidal) bzw. sp3d2‐Zuständen (TeF4, pseudo‐oktaedrisch) beschrieben werden.
Abstract Single crystals of the stable modification of selenium tetrachloride (α-SeCl4) were grown by sublimation, and the crystal structure was determined. As that of metastable β-SeCl4 it contains tetrameric cubane-like molecules Se4Cl4, but with different point symmetry and in positions which correspond to those of the atoms of the β-tungsten structure type.
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