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Chemical isomerism characterized by facile interconversion of isomeric forms in equilibrium, especially by migration of a hydrogen atom.

tau′to·mer (tô′tə-mər) n.
tau′to·mer′ic (tô′tə-mĕr′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(Elements & Compounds) either of the two forms of a chemical compound that exhibits tautomerism
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References in periodicals archive ?
This could be due to intramolecular electron transfer via valence tautomerism between electroactive ligand and metal ion [23-26] causing fast disproportionation of Cu(I) complex to give Cu(II) or some rearrangement within complex so as to give a more stabilized species.
Ruiz-Molina, "Valence tautomerism: more actors than just electroactive ligands and metal ions," Comptes Rendus Chimie, vol.
In addition to magnets and nanomagnets, we have reported several tunable paramagnetic mononuclear complexes showing spin crossover, valence tautomerism, and changes in orbital angular momentum.