24is it due to backbonding ??
as explained by aieeee here
http://targetiit.com/iit-jee-forum/posts/ino-12715.html
Structures of (SiH3)3N and (CH3)3N are the different - Why?
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156Yes, pÎ - dÎ back bonding is the reason behind the difference in structure. Can you explain the structures also.
And a question on this... Why does pÎ - dÎ occur in one of these only? Not in the other one?
1The structure of (SiH3)3N , or trisilyl ammine is planar due to strong pπ - dπ back bonding whereas (CH3)3N ,or trimethyle ammine has a tetrahedral structure.
156Now that's the conceptual error that I was looking for ...
Correct Concept: Be it Carbon or for that matter any atom there are always empty d-orbitals present, but they are usually too high in energy to be used. Sufficient energy needs to be provided to bring these high energy orbitals into the picture.
There are reactions which take place in case of carbon compounds at high temperature involving d-orbitals.
Rest, the structures mentioned above are ok.