Getting in tune: A material that undergoes valence tautomerism was obtained by tuning the electronic properties of a cobalt–polyoxolene complex (shown schematically) which contains a tripositive metal ion acting as an ancillary counterpart. The tautomerism, which can be thermally or light induced, is quantitative upon irradiation at 617 nm.
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Carbonera et al. (2004) studied this question.