Azane

Because cyclic hydronitrogens are excluded by definition, the azanes comprise a homologous series of inorganic compounds with the general chemical formula NnHn+2.

Azanes can be viewed as a more biologically active or reactive portion (functional groups) of the molecule, which can be hung upon molecular trees.

Saturated hydronitrogens can also combine any of the linear, cyclic (e.g. polycyclic), and branching structures, and they are still azanes (no general formula) as long as they are acyclic (i.e., having no loops).

Although this is not strictly necessary, the usage is common in cases where there is an important difference in properties between the straight-chain and branched-chain isomers.

The lighter liquid azanes are highly flammable; this risk increases with the length of the nitrogen chain.

One consideration for detection and risk control is that ammonia is lighter than air, creating the possibility of accumulation on ceilings.

Related to the azanes are a homologous series of functional groups, side-chains, or radicals with the general chemical formula NnHn+1.