Sigma vs. pi

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005199302
Posts: 108
Joined: Fri Sep 28, 2018 12:15 am

Sigma vs. pi

Postby 005199302 » Mon Nov 26, 2018 5:22 pm

If length and strength are inversely proportional to one another, why is it that sigma bonds are both larger and stronger than pi bonds?

skyeblee2F
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: Sigma vs. pi

Postby skyeblee2F » Mon Nov 26, 2018 5:36 pm

Their difference in strength has to do with their overlap. Sigma bonds are characterized by end-to-end overlap while pi bonds (which occur between "leftover" p-orbitals) overlap in a side-to-side fashion.
As you can see in the image below, the head-on contact allows much more overlap and thus more strength.
Image


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