In case of N(SiH3)3, why do we see back bonding How does Si has empty d orbitals when - Chemistry - Chemical Bonding and Molecular Structure

Question

In case of N(SiH3)3, why do we see back bonding? How does Si has
empty d orbitals when it is hybridized to Sp3 hybridization?
shouldn't it just have covalency for 4 electrons

Shyama Charan Mandal · Accepted Answer

Dear Student,

Nitrogen has lone pair (N atom is sp2 hybridised) and silicon has 2
d orbital so the lone pair of Nitrogen makes bond with empty d
orbital of silicon therefore back bonding happens Silicon belongs
to the group carbon Silicon belongs to 3rd period so it will have a
d orbital but it combines with only three hydrogen so hydrogen
occupies only P orbital and not d-orbital which is vacant Empty d
orbital of Si orbital forming dπ-pπ back bonding
<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ck_5b4379c18c7c1%20jpg">

Regards,

In case of N(SiH3)3, why do we see back bonding? How does Si has empty d orbitals when it is hybridized to Sp3 hybridization? shouldn't it just have covalency for 4 electrons