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.

These models show how the atoms and bonds are arranged in space. The diagram shows a ball-and-stick model of ammonia.

This approach involves modulating intralayer hydrogen bonding and optimizing anionic frameworks. Using this method, the researchers synthesized a series of two-aminopyrazine-based birefringent ...