Pi and Sigma bonds

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RaniyaFeroz_1E
Posts: 84
Joined: Wed Sep 30, 2020 9:32 pm

Pi and Sigma bonds

Postby RaniyaFeroz_1E » Sun Nov 29, 2020 11:19 pm

What's the difference between pi bonds and sigma bonds?

Taha 2D
Posts: 75
Joined: Wed Sep 30, 2020 9:50 pm

Re: Pi and Sigma bonds

Postby Taha 2D » Sun Nov 29, 2020 11:24 pm

sigma bonds are single bonds. You can only have one sigma bond. Sigma bonds have symmetrical electron densities allowing rotation of atoms which are bonded and share electrons through end to end overlapping along the internuclear axis. Pi bonds have a central node where there is no electron density and they overlap side by side. they are the second bond in double bonds and sigma bonds are stronger.

Victoria_Sauceda_1B
Posts: 75
Joined: Wed Sep 30, 2020 9:38 pm

Re: Pi and Sigma bonds

Postby Victoria_Sauceda_1B » Sun Nov 29, 2020 11:28 pm

Sigma bonds are formed by end-to-end overlapping while pi bonds are formed when the lobe of one orbitals overlaps another.
Single bond: 1 sigma
Double bond: 1 sigma, 1 pi
Triple bond: 1 sigma, 2 pi

Anh Trinh 1J
Posts: 144
Joined: Wed Sep 30, 2020 9:55 pm
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Re: Pi and Sigma bonds

Postby Anh Trinh 1J » Sun Nov 29, 2020 11:30 pm

Sigma bonds are cylindrically symmetrical (the same in all directions around the long axis of the bond), with no nodal plans containing the internuclear axis. This is when the s-orbitals overlap end to end, forming a sigma bond; the greater the extent of orbital overlap, the stronger the bond. All single covalent bonds are sigma bonds.

A pi bond is a bond in which the 2 electrons lie on 2 lobes, one on each side of the internuclear axis. A pi bond has a single nodal plane containing the internuclear axis. Pi bonds overlap side-by-side. A pi bond has electron density on each side of the internuclear axis, with the electron cloud in the form of 2 lobes.

Rose_Malki_3G
Posts: 123
Joined: Wed Sep 30, 2020 10:02 pm

Re: Pi and Sigma bonds

Postby Rose_Malki_3G » Sun Nov 29, 2020 11:37 pm

Sigma bonds are single bonds whereas pi bonds occur in any bonds other than single bonds. Sigma bonds are more flexible whereas pi bonds are more fixed in their positions.


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