Its size can be used to predict the strength and stability of transition metal complexes, as well as the colors they produce in solution.
The same analogy can be made between the LUMO level and the conduction band minimum.
[3] In organometallic chemistry, the size of the LUMO lobe can help predict where addition to pi ligands will occur.
A SOMO is a singly occupied molecular orbital such as half-filled HOMO of a radical.
If existent, the molecular orbitals at one energy level below the HOMO and one energy level above the LUMO are also found to play a role in frontier molecular orbital theory.