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Electromerism is a type of
isomerism In chemistry, isomers are molecules or polyatomic ions with identical molecular formulae – that is, same number of atoms of each element – but distinct arrangements of atoms in space. Isomerism is existence or possibility of isomers. Iso ...
between a pair of molecules (electromers, electro-isomers) differing in the way electrons are distributed among the atoms and the connecting chemical bonds. In some literature electromerism is equated to valence tautomerism, a term usually reserved for tautomerism involving reconnecting chemical bonds. 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 oxidation state with their ligands (see non-innocent ligand). One of the first instances was a cobalt bis(quinone) complex described by Buchanan and Pierpont in 1980 with a cobalt(II) complex in chemical equilibrium with the cobalt(III) complex. Ligands commonly found are based on dioxolenes, phenoxyl radicals and polychlorotriphenylmethyl radicals. Metalloporphyrins have also been studied. A set of electromers not requiring redox-active ligands have been described as well as a set without a metal. A new group of electromers has also been described recently.


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{{Reflist Isomerism