pi bond orientation

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Marni Kahn 1A
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Joined: Thu Jul 25, 2019 12:17 am
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pi bond orientation

Postby Marni Kahn 1A » Wed Nov 20, 2019 10:13 am

why do pi bonds inhibit rotation of a molecule?

Michael Nguyen 1E
Posts: 120
Joined: Sat Aug 17, 2019 12:17 am

Re: pi bond orientation

Postby Michael Nguyen 1E » Wed Nov 20, 2019 10:16 am

Pi bonds inhibit rotation in a molecule because the orbitals that are interacting to form the bond are arranged side-by-side, not end-to-end. Since they are arranged side-by-side, rotating the molecule would prevent the orbitals from overlapping, break the pi bond, and would require a chemical reaction.

Ying Yan 1F
Posts: 101
Joined: Fri Aug 02, 2019 12:16 am

Re: pi bond orientation

Postby Ying Yan 1F » Wed Nov 20, 2019 1:12 pm

The region of electron density for an pi bond is not actually on the bond axis, but rather parallel "on top" and "below" it, creating a bean-shaped region of e- density. Therefore, if the bond rotates, the bean-shape will break because the regions of electron density are no longer parallel. Sorry if this explanation confuses instead of helps you. I suggest googling a picture of pi bonds, it makes much more sense if you have a visual.

Max Madrzyk Dis 4G
Posts: 102
Joined: Wed Sep 18, 2019 12:21 am

Re: pi bond orientation

Postby Max Madrzyk Dis 4G » Wed Nov 20, 2019 1:33 pm

Pi bonds are rigid because of their orientation around the axis being across it rather that along it therefore not allowing for the movement observed in sigma bonds.

Bryce Barbee
Posts: 103
Joined: Wed Sep 18, 2019 12:20 am

Re: pi bond orientation

Postby Bryce Barbee » Wed Nov 20, 2019 1:34 pm

The orbitals of the bonds are arranged side by side which makes it so that they cannot rotate amongst themselves.

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