Trimethyl amine {(CH3)3N:} has sp3 hybridization at N atom and three bond pair and one lone pair electron. Thus trimethyl amine is pyramidal.
But in trisilyl amine {(SiH3)3N:} there is 2pπ—3dπ back bonding between lone pair orbital of nitrogen into
vacant orbital of silicon. Hence trisilyl amines is
sp2, planer & is less basic than trimethyl amine.
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