Rotation from Sigma and Pi bonds

(Polar molecules, Non-polar molecules, etc.)

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Rian Montagh 2K
Posts: 60
Joined: Fri Sep 28, 2018 12:15 am

Rotation from Sigma and Pi bonds

Postby Rian Montagh 2K » Mon Nov 19, 2018 11:33 am

Why can atoms with sigma bonds rotate, but a pi bond will not allow it to rotate?

Anand Narayan 1G
Posts: 61
Joined: Fri Sep 28, 2018 12:15 am

Re: Rotation from Sigma and Pi bonds

Postby Anand Narayan 1G » Mon Nov 19, 2018 11:35 am

Sigma bonds have their electron density along the bond axis, while pi bonds have their electron density above and below the bond axis. Therefore, pi bonds cannot rotate the same way as sigma bonds since rotation would break the pi bond interaction.

Ibrahim Malik 1H
Posts: 65
Joined: Fri Sep 28, 2018 12:27 am
Been upvoted: 1 time

Re: Rotation from Sigma and Pi bonds

Postby Ibrahim Malik 1H » Mon Nov 19, 2018 11:49 am

The condition for double bonds is to be stable and rigid. A combination of a pi and sigma bond (forms a double bond) has restrictions on how the bond can rotate. If this bond rotates past its range of motion, the double bond would break.


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