Pi bonds in triple bonds

[Joanna Zhao 1J]

I was just wondering what the proper pi bond notation would be for, say, a CN- ion. C and N are triple bonded and each atom has one lone pair. Both C and N are sp hybridized because they both have two regions of electron density. So, the sigma bond between them would be sigma(C 2sp, N 2sp). Since both atoms have two unhybridized p orbitals (conservation of orbitals), would we notate the two pi bonds as pi(C 2p2, N 2p2)? Or is each pi bond pi(C 2p, N 2p) since one pi bond is attributed to one unhybridized p orbital? Should we write pi(C 2px, N 2px) and pi(C 2py, N 2py)? What is the proper notation?

[Jonathan Sautter 1J]

I think that the correct way to label the triple bond would be sigma(C 2sp, N 2sp), pi(C 2p, N 2p), pi(C 2p, N 2p). I'm not entirely sure whether you could clump the two pi bonds together and just write 2pi(C 2p, N 2p), but look back at problem 2.65 in Focus 2 exercises because this problem gives a similar example, but with double bonds. Hope this helps!

[605721741]

The first bond is sigma. Then the next two are pi bonds!

[Irene Kim 3E]

I think it is safer to write each orbital separately, including the 2 pi bonds. Each triple bond will include 1 sigma bond and 2 pi bonds.

[Natalie Quilala 1I]

For triple bond, the main component to understand is that there will be 2 pi bonds and 1 sigma bond making up the three bonds. This will be a much stronger and rigid bond due to the two pi bonds it has.