Sigma and Pi bonds

[Lily Mohtashami]

Can someone explain what a sigma bond is and what a Pi bond is? Also does anyone know which lecture we learned this in because I don't remember learning about it?

[Benjamin Chen 1H]

Sigma bonds are head-on electron orbital overlaps while pi bonds are side-by-side electron orbital overlaps.

We haven't covered this yet. This has to do with VSEPR theory.

[KatarinaReid_3H]

I am not sure that he went into much detail about them last week. A single bond is a sigma bond. Double bond has one sigma, one pi. Triple has one sigma, 2 pi bonds. A sigma bond is stronger than a pi bond. Sigma bonds are overlapping of electrons on the end of each atom; it is a linear overlapping. A pi bond is the actual lobes overlapping; electrons are on top and bottom of the axis. Thus, that is why pi bonds usually occur where there are p-orbitals and sp hybridization.

[SahajDole_1C]

Sigma and pi bonds are the bonds on the atom . Sigma is one and pi is a double bond. We have not covered this topic yet.

[Taber Ball 1F]

Hi! I don't recall this topic being mentioned in the lectures. Just confirming - we will not need to know this for the midterm next week? Thank you!

[Taber Ball 1F]

I am not sure that he went into much detail about them last week. A single bond is a sigma bond. Double bond has one sigma, one pi. Triple has one sigma, 2 pi bonds. A sigma bond is stronger than a pi bond. Sigma bonds are overlapping of electrons on the end of each atom; it is a linear overlapping. A pi bond is the actual lobes overlapping; electrons are on top and bottom of the axis. Thus, that is why pi bonds usually occur where there are p-orbitals and sp hybridization.

Thank you so much for this awesome explanation! It was so helpful (:

[Marisa Gaitan 2D]

Hi! I don't recall this topic being mentioned in the lectures. Just confirming - we will not need to know this for the midterm next week? Thank you!

I don't think Lavelle covered this in lectures yet either, so we won't have to know it. The midterm covers everything from the last eight bullets on outline 2 through the concepts in today's (11/11) lecture which I believe finishes outline 3.

[Taber Ball 1F]

Hi! I don't recall this topic being mentioned in the lectures. Just confirming - we will not need to know this for the midterm next week? Thank you!

I don't think Lavelle covered this in lectures yet either, so we won't have to know it. The midterm covers everything from the last eight bullets on outline 2 through the concepts in today's (11/11) lecture which I believe finishes outline 3.

Ok! Thank you so much! Just wanted to make sure (:

Have a great day!

[Lillian]

Do we need to know the details of the difference between sigma, pi, and delta bonds?
Or just this?:
single bond = 1 sigma
double bond = 1 sigma 1 pi
triple bond = 1 sigma 2 pi
quadruple bond = 1 sigma 2 pi 1 delta

[Gabe_Ek 1G]

I am not sure that he went into much detail about them last week. A single bond is a sigma bond. Double bond has one sigma, one pi. Triple has one sigma, 2 pi bonds. A sigma bond is stronger than a pi bond. Sigma bonds are overlapping of electrons on the end of each atom; it is a linear overlapping. A pi bond is the actual lobes overlapping; electrons are on top and bottom of the axis. Thus, that is why pi bonds usually occur where there are p-orbitals and sp hybridization.

This explanation helped me understand the sigma and pi bonds a bit better, thank you! But yea I also don't think Lavelle had covered this material yet.