sigma and pi bonds

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505095793
Posts: 61
Joined: Fri Sep 28, 2018 12:25 am

sigma and pi bonds

Postby 505095793 » Sun Nov 25, 2018 9:04 pm

Why can sigma bonds rotate, but not pi bonds?

Hanlin Zhu 4G
Posts: 30
Joined: Fri Sep 28, 2018 12:28 am

Re: sigma and pi bonds

Postby Hanlin Zhu 4G » Sun Nov 25, 2018 9:14 pm

A sigma bond is in direction along the bond axis, like a stick connecting two balls, so atoms can rotate freely. The pi bonds is formed above and below the sigma bond, so it is only stable in one orientation and cannot rotate.

Noh_Jasmine_1J
Posts: 71
Joined: Fri Sep 28, 2018 12:15 am

Re: sigma and pi bonds

Postby Noh_Jasmine_1J » Mon Nov 26, 2018 4:33 pm

sigma bonds are located on the axis and so they are able to rotate around it, but pi bonds are located above and below the axis and therefore cannot rotate

daniella_knight1I
Posts: 57
Joined: Fri Sep 28, 2018 12:18 am

Re: sigma and pi bonds

Postby daniella_knight1I » Tue Nov 27, 2018 9:12 am

A pi bond is a nodal plane in the internuclear axis, therefore, it cannot rotate because it is holding together at two points in the nucleus.

Carlos De La Torre 2L
Posts: 60
Joined: Tue Oct 09, 2018 12:16 am

Re: sigma and pi bonds

Postby Carlos De La Torre 2L » Thu Nov 29, 2018 10:57 pm

a sigma bond can rotate because it is connected at one point so the atoms can rotate freely, in a double or triple bond (containing a sigma and pi bonds) there are connections at either 3 or 5 points and so if it was to rotate, it would need to break the bonds at those points and reform them at the new points, which is just not going to happen by itself.


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