## pi bond orientation

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

Marni Kahn 1A
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### pi bond orientation

why do pi bonds inhibit rotation of a molecule?

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

### Re: pi bond orientation

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
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Joined: Fri Aug 02, 2019 12:16 am

### Re: pi bond orientation

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.

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### Re: pi bond orientation

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
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Joined: Wed Sep 18, 2019 12:20 am

### Re: pi bond orientation

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