Why is the following bond hydrogen bonding if it's between C=O and N-H?

This forum made possible through the generous support of SDN members, donors, and sponsors. Thank you.


Full Member
May 22, 2020
Reaction score

The O isn't attached to another H so I'm a bit confused about this

Members don't see this ad.
The O is more negatively charged since it pulls electrons to it while the H is more positive since it loses electron density to N. This creates a - and + that makes hydrogen bonding possible.
  • Like
Reactions: 1 user
A hydrogen bond requires the hydrogen on a functional group with -ZH to be attracted to a polar Z, where Z can be oxygen, nitrogen, or flourine. This fulfills that requirement.

You'll often see things say that carbonyls can't hydrogen bond, which is why ketones and aldehydes have lower boiling points than alcohols. What they actually mean is that aldehydes and ketones can't hydrogen bond to THEMSELVES, they can still fulfill the requirement as polar oxygens when an H attached to an O, N, or F comes by.
  • Like
Reactions: 1 user