[Typhus]

Hi

I learned something in organic chem I didn't quite understand. Normally I understand that interaction between a Hydrogen (say from a water molecule) and a Nitrogen is a hydrogen bonding due to the high electronegativity of the nitrogen. However when interacting with the nitrogen in acetonitrile the interaction was described as dipole dipole because possibly the nitrogen is triple bonded to a carbon atom.

Why is it a dipole dipole bond rather than hydrogen bonding? I realize it has to do with the triple bond. Does the fact that the Nitrogen is triple bonded lower its electronegavity? How does this work?

Thanks.