Sigma bonds

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Sigma bonds

Postby Arkinrao3A » Sat Oct 29, 2016 1:23 pm

Why is it that there can not be more than one sigma bond, or is there a case where you can have two or more sigma bonds?

Simon Kapler 3I
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Re: Sigma bonds

Postby Simon Kapler 3I » Sat Oct 29, 2016 2:29 pm

The hybridization theory of bonding differentiates between sigma and pi bonds based on how they overlap, which depends on their orientation in space. In a sigma bond, two orbitals pointing toward each other (along the internuclear axis) overlap end-over-end, whereas in a pi bond, two parallel orbitals (both perpendicular to the internuclear axis) overlap side-by-side. Since the orbitals of an atom all point in different directions away from the nucleus, there would not be a situation in which two different orbitals from each atom overlapped end-to-end (a sigma bond) between a pair of atoms. Hope this is helpful/makes sense!

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