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Predict whether the following molecules are iso structural or not. Justify your answer. (i) NMe3 (ii) N(SiMe3)3

Predict whether the following molecules are iso structural or not. Justify your answer. 


 (i) NMe3 (ii) N(SiMe3)3

Grade:11

2 Answers

GAURAV SINGH
askIITians Faculty 36 Points
7 years ago
NMe3 and N(SiMe3)3 are not isostructural. N(Me)3 is trigonal pyramidal while N(SiMe3)3 is trigonal planar due to back bonding.
In N(SiMe3)3, three sp2orbitals are used forbonding, giving a plane triangular structure.
The lone pair of electrons occupy a p-pi-orbitalat right angles to the plane triangle. Thisoverlaps with empty d-pi-orbitals on each of the
three silicon atoms and results in bonding .

Gaurav Singh
askIITians Faculty
BS-MS, IISER Bhopal
Devanshi Sawhney
13 Points
one year ago
  • No they would not be isostructural.
  1. Nitrogen has a very bulky group attached to it in N(SiMe3)as compared to NMe3.
  2. Due to hinderance, the SiMe3 group will increase its bond angles overcoming the bond pair and lone pair repulsion.

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