Answer:
In trisilicylamine \[{{(Si{{H}_{3}})}_{3}}\overset{..}{\mathop{N}}\,,\]
the lone electron pair on the nitrogen atom is involved in\[p\pi -d\pi \]
bonding with the vacant 3d orbitals on silicon atom. As a result, it is not as
easily available to the attacking Lewis acid as in case of trimethylamine \[{{(C{{H}_{3}})}_{3}}\overset{..}{\mathop{N}}\,,\]
where the electron pair is rather free.
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