Electromerism
Electromerism is a type of
valence tautomerism,[2] a term usually reserved for tautomerism involving reconnecting chemical bonds.[3]
One group of electromers are excited electronic states but isomerism is usually limited to ground state molecules. Another group of electromers are also called redox isomers: metal ions that can exchange their
dioxolenes, phenoxyl radicals and polychlorotriphenylmethyl radicals. Metalloporphyrins have also been studied. A set of electromers not requiring redox-active ligands have been described [5][6] as well as a set without a metal.[7] A new group of electromers has also been described recently.[8][9]