Hydrogen bonds are responsible for the lattice structure of frozen water, ... In F–H–F –, a fluorine anion forms a hydrogen bond with the hydrogen in a covalent HF molecule.

Ammonia (NH 3) and hydrogen fluoride (HF) both also have higher boiling points than might be predicted due to presence of hydrogen bonding between the molecules. Next page.

Hydrogen bonding, a key interaction between molecules, has been considered essential for optimizing these materials. However, previous studies have struggled to confirm its universal role.