SiF _6^ 2- is known but SiCl _6^ 2- is not, why? - Vidyadip

Question

$SiF _6^{2-}$ is known but $SiCl _6^{2-}$ is not, why?

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Answer

Due to smaller size of F as compared to Cl , steric repulsions will be less in $SiF _6^{2-}$ than in $SiCl _6^{2-}$. Because of smaller $S - F$ bond as compared to $S - Cl$ bond, the interaction of F lone pair of electrons with Si is stronger than that of Cl lone pairs.

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