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Stability of Sigma and Pi Bonds

Posted: Tue Nov 19, 2019 12:42 am
by AGaeta_2C
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!

Re: Stability of Sigma and Pi Bonds

Posted: Tue Nov 19, 2019 1:09 am
by 905416023
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.

Re: Stability of Sigma and Pi Bonds

Posted: Tue Nov 19, 2019 10:25 am
by Sarah Nichols 4C
The orbitals in sigma bonds overlap to a greater extent than in pi bonds, so electron density is more concentrated

Re: Stability of Sigma and Pi Bonds

Posted: Tue Nov 19, 2019 2:42 pm
by Amy Pham 1D
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.

Re: Stability of Sigma and Pi Bonds

Posted: Sun Nov 24, 2019 11:51 pm
by cassidysong 1K
In sigma bonds the areas of electron density are overlapping whereas pi bonds only have regions of electron density side by side.