Two distinct hydrogen-bonding modes, end-on and end-to-end coordination, have been observed in the complexation between macrocycles and polyatomic anions such as azide and oxoanions.
Jeong, K-S., Kim, N-K., Chang, K-J., Moon, D., & Lah, M. S. (2007). Two distinct anion-binding modes and their relative stabilities. Chemical Communications, 0, 3401-3403 . https://doi.org/10.1039/B707032B