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How would you explain the experimental observations that the  SeF6 unit in Cs2[SeF6] is C2v and looks like six of the seven vertices of a  capped trigonal prism are occupied by F, but the  SeCl6 unit in Cs2[SeCl6] has Ohsymmetry ?

Question

How would you explain the experimental observations that the  SeF6 unit in Cs2[SeF6] is C2v and looks like six of the seven vertices of a  capped trigonal prism are occupied by F, but the  SeCl6 unit in Cs2[SeCl6] has Ohsymmetry ?

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The electronegativity of fluorine is higher than the chlorine, this results the bond length of S-F is lower than the bond length of S-Cl.

[SeF6]2- and [SeCl6]2- are contains pair of electrons in 2-, in the Cs2[SeF6] complex lone pair of selenium is distract the octahedral geometry. This distracted octahedral is results th...

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