Pi Bonds break


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Ian_Lee_1E
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Joined: Wed Sep 30, 2020 9:31 pm

Pi Bonds break

Postby Ian_Lee_1E » Mon Nov 30, 2020 11:10 am

Hello,

Professor mentioned that Pi bonds can break when the central atoms rotate.

Are there any cases when they do rotate and what is the cause of their rotation?

Abby Lam 3F
Posts: 109
Joined: Wed Sep 30, 2020 9:46 pm

Re: Pi Bonds break

Postby Abby Lam 3F » Mon Nov 30, 2020 11:13 am

I think they rotate when you break the bond through some sort of chemical experiment, probably like boiling something.

Nicole Huang 3F
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Re: Pi Bonds break

Postby Nicole Huang 3F » Mon Nov 30, 2020 11:13 am

I don't think pi bonds can rotate without that pi bond breaking because a pi bond is formed in a parallel fashion, so rotating it would destroy that parallel orientation that we see as a characteristic of pi bonds.

Margaret Wang 2D
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Joined: Wed Sep 30, 2020 9:58 pm

Re: Pi Bonds break

Postby Margaret Wang 2D » Mon Nov 30, 2020 12:19 pm

I don't think there are any exceptions to this because pi bonds are parallel and any sort of rotation would break them.

Inderpal Singh 2L
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Re: Pi Bonds break

Postby Inderpal Singh 2L » Mon Nov 30, 2020 12:39 pm

I do not believe there would be any exceptions to this, however, I would seek further clarification.

Jagveer 1I
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Re: Pi Bonds break

Postby Jagveer 1I » Mon Nov 30, 2020 1:27 pm

In the textbook it was mentioned that for a molecule to rotate about the double bond, the π-bond would need to first break and then re-form. So, I believe that this is the only way that the central atom can rotate with π-bonds.

Vanshika Bhushan 1A
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Re: Pi Bonds break

Postby Vanshika Bhushan 1A » Mon Nov 30, 2020 1:36 pm

Molecules joined by a pi bond cannot rotate about that bond without breaking the pi bond, because rotation involves destroying the parallel orientation of the p orbitals.

Faith Lee 2L
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Re: Pi Bonds break

Postby Faith Lee 2L » Mon Nov 30, 2020 3:20 pm

Pi bonds are characterized by their side-to-side overlap, which results in extreme rigidity. I don't know of any exceptions to the fact that attempting to move pi-bonded atoms independently of each other would cause the bond to break.

Brian Bui 3H
Posts: 91
Joined: Wed Sep 30, 2020 9:42 pm

Re: Pi Bonds break

Postby Brian Bui 3H » Mon Nov 30, 2020 3:33 pm

With pi bonds, I believe individual atoms cannot rotate for the reasons stated above. However, the entire molecule as a whole (or parts connected by pi bonds) can rotate, but have to do so together or else the pi bond(s) will break.


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