pi bonds and rotation


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905085650
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

pi bonds and rotation

Postby 905085650 » Sun Nov 25, 2018 10:31 pm

do pi bonds allow free rotation? if not, what happens to the bonds if there is rotation?

thank you!!

Jim Brown 14B Lec1
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: pi bonds and rotation

Postby Jim Brown 14B Lec1 » Sun Nov 25, 2018 10:33 pm

Pi-bonds do not allow free rotation, if the molecule is rotated, the pi-bond will break. This results in rigidly structured molecules.

AvaGordon_4F
Posts: 34
Joined: Fri Sep 28, 2018 12:25 am

Re: pi bonds and rotation

Postby AvaGordon_4F » Sun Nov 25, 2018 11:01 pm

Yeah, so pi bonds don't allow any rotation at all. An easy way to visualize this is to think of how sigma bonds are arranged tip to tip, so theres only one area of overlap between them (so they can rotate) but pi bonds are arranged side to side, so there are two areas of overlap between them. If a pi bond were to rotate, then the areas of overlap couldnt remain in contact, and so no rotation is allowed.

Jonathan Cheng 3C
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Joined: Fri Sep 28, 2018 12:23 am
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Re: pi bonds and rotation

Postby Jonathan Cheng 3C » Mon Nov 26, 2018 10:31 am

Pi bonds do not allow free rotation. The pi bond results in a rigid structure and the two molecules would rotate together and they would not be able to rotate freely in their own plane. If a pi bond did freely rotate, the bonding regions would not remain intact.


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