Stability of Sigma and Pi Bonds

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AGaeta_2C
Posts: 112
Joined: Wed Sep 18, 2019 12:21 am

Stability of Sigma and Pi Bonds

Postby AGaeta_2C » Tue Nov 19, 2019 12:42 am

Why are sigma bonds more stable? Similarly, it was said in lecture that pi bonds are weaker because the electrons "are more exposed." In what way can electrons be "more exposed"? Thank you in advance!

905416023
Posts: 54
Joined: Thu Jul 25, 2019 12:17 am

Re: Stability of Sigma and Pi Bonds

Postby 905416023 » Tue Nov 19, 2019 1:09 am

I think it may have to do with the fact that in sigma bonds atoms can rotate. But I'm not 100% sure and am a little confused on this too.

Sarah Nichols 4C
Posts: 52
Joined: Sat Aug 24, 2019 12:18 am

Re: Stability of Sigma and Pi Bonds

Postby Sarah Nichols 4C » Tue Nov 19, 2019 10:25 am

The orbitals in sigma bonds overlap to a greater extent than in pi bonds, so electron density is more concentrated

Amy Pham 1D
Posts: 103
Joined: Fri Aug 09, 2019 12:15 am

Re: Stability of Sigma and Pi Bonds

Postby Amy Pham 1D » Tue Nov 19, 2019 2:42 pm

In pi bonds, the two regions of electron density overlap side by side rather than end to end, creating a nodal plane including the internuclear region. This is likely what was meant when it was stated that pi bond electrons are more exposed, as the regions of electron density lie outside of the internuclear region and are located perpendicular to the axis.

cassidysong 1K
Posts: 100
Joined: Fri Aug 30, 2019 12:15 am

Re: Stability of Sigma and Pi Bonds

Postby cassidysong 1K » Sun Nov 24, 2019 11:51 pm

In sigma bonds the areas of electron density are overlapping whereas pi bonds only have regions of electron density side by side.


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