Pi and Sigma Bonds

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

Tyler Fidler 4J
Posts: 13
Joined: Fri Sep 25, 2015 3:00 am

Pi and Sigma Bonds

I understand the concepts of Pi and Sigma bonds when writing them out on their electron configurations. But in the 3D models, I really do not understand where to put the Pi or Sigma Bonds and exactly how to draw them???

Chem_Mod
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Re: Pi and Sigma Bonds

Esteban Espinoza
Posts: 9
Joined: Fri Jun 17, 2016 11:28 am

Re: Pi and Sigma Bonds

I read that Sigma-bonds are stronger than Pi-bonds, but I really don't understand, Like why does a Side-to-Side overlap mean its Most resistant to twisting and Prevents atoms with large radii from forming multiple bonds, therefore making it a Weaker bond than a Sigma-bond?

Chem_Mod
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Re: Pi and Sigma Bonds

Strength of bonds are related to the overlap of the molecular orbitals. As you can see from the geometry of the Pi bonds, the overlap of the orbitals is less than that of the Sigma bonds.

But, double bonds are stronger than single bonds since double bond = Pi + sigma bond while single = sigma bond.