Sigma and Pi Bonds

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Rachel Min
Posts: 21
Joined: Fri Sep 29, 2017 7:04 am

Sigma and Pi Bonds

Postby Rachel Min » Sat Nov 25, 2017 9:44 pm

Why is it that you can have two pi bonds and a sigma bond in a triple bond but not two sigma bonds and one pi bonds? Does it only have to do with the way that the bonds form? Like the shape and placement?

Curtis Tam 1J
Posts: 105
Joined: Thu Jul 13, 2017 3:00 am

Re: Sigma and Pi Bonds

Postby Curtis Tam 1J » Sat Nov 25, 2017 10:08 pm

A sigma bond is a direct overlap, whereas pi bonds overlap side by side on both sides of an internuclear axis. I don't believe there is a way for two atoms to directly overlap their orbitals two times. Pi bonds can because you can have two sets of pi bonds perpendicular to each other.

Matthew 1C
Posts: 47
Joined: Fri Sep 29, 2017 7:06 am

Re: Sigma and Pi Bonds

Postby Matthew 1C » Sat Nov 25, 2017 11:11 pm

https://upload.wikimedia.org/wikipedia/ ... onding.png

idk if this helps but it shows how there can be more than just one pi bond. it also shows how a sigma bond forms in comparison to pi bonds

Lily Sperling 1E
Posts: 49
Joined: Tue Oct 10, 2017 7:14 am

Re: Sigma and Pi Bonds

Postby Lily Sperling 1E » Sun Nov 26, 2017 6:33 am

You can have one sigma bonds and two pi bond because the sigma bond is the first bond formed. The following bonds that are created are pi bonds which bond at two or more locations, prohibiting rotation. You will not encounter any molecule with two sigma bonds connecting only two atoms.

Annalise Eder 2L
Posts: 49
Joined: Sat Jul 22, 2017 3:01 am

Re: Sigma and Pi Bonds

Postby Annalise Eder 2L » Sun Nov 26, 2017 2:40 pm

A single bond is always a sigma bond. In a a double or triple bond the first bond is always a sigma bond, but any following bonds must be pi bonds.

Rachel Min
Posts: 21
Joined: Fri Sep 29, 2017 7:04 am

Re: Sigma and Pi Bonds

Postby Rachel Min » Wed Nov 29, 2017 6:09 pm

Thank you! This really helped a lot! :)


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