Electromerism: Difference between revisions
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'''Electromerism''' is a type of [[isomerism]] between a pair of [[molecule]]s ('''electromers''', '''electro-isomers''') differing in the way [[electron]]s are distributed among the atoms and the connecting chemical bonds <ref>{{cite DOI|10.1038/nchem.564}}</ref>. In some literature electromerism is equated to [[valence tautomerism]] <ref>{{cite DOI|10.1002/ejic.200500323}}</ref>, a term usually reserved for tautomerism involving reconnecting chemical bonds <ref>{{cite DOI|10.1126/science.46.1195.493}}</ref>. |
'''Electromerism''' is a type of [[isomerism]] between a pair of [[molecule]]s ('''electromers''', '''electro-isomers''') differing in the way [[electron]]s are distributed among the atoms and the connecting chemical bonds <ref>{{cite DOI|10.1038/nchem.564}}</ref>. In some literature electromerism is equated to [[valence tautomerism]] <ref>{{cite DOI|10.1002/ejic.200500323}}</ref>, a term usually reserved for tautomerism involving reconnecting chemical bonds <ref>{{cite DOI|10.1126/science.46.1195.493}}</ref>. |
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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 <ref>{{cite DOI|10.1021/ja00535a021}}</ref> |
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 <ref>{{cite DOI|10.1021/ja00535a021}}</ref> with a cobalt(II) complex in [[chemical equilibrium]] with the cobalt(III) complex. Ligands commonly found are based on [[dioxolene]]s, [[phenol|phenoxyl radicals]] and [[triphenylmethyl radical|polychlorotriphenylmethyl radicals]]. [[Metalloporphyrin]]s have also been studied. A set of electromers not requiring redox-active ligands have been described <ref>{{cite DOI|10.1002/anie.200903201}}</ref> as well as a set without a metal <ref>{{cite DOI|10.1021/ja037252v}}</ref> |
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==References== |
==References== |
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Revision as of 17:42, 12 April 2010
Electromerism is a type of isomerism between a pair of molecules (electromers, electro-isomers) differing in the way electrons are distributed among the atoms and the connecting chemical bonds [1]. In some literature electromerism is equated to 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 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 [4] 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 [5] as well as a set without a metal [6]