Valence tautomerism is a form of isomerism in which the isomers differ only in electron distribution. Most examples involve transition metal ions coordinated to redox active ligands such as dioxolenes, and involve electron transfer to or from the ligand combined with a change in oxidation state of the metal ion. The resulting changes in optical and magnetic properties have potential as sensors and molecular switches. Recently we, and others have discovered that 6-oxoverdazyls form another class of redox active ligands with the potential for valence tautomerism. In particular, the cobalt coordination compounds with verdazyl pincer ligand <b>dipyvd</b> show both solvent and temperature dependent valence tautomerism. In this study we report on the temperature induced changes in the electronic spectra near room temperature and use these to examine the thermodynamic parameters of the valence tautomeric equilibrium

Probing valence tautomerism in a cobalt verdazyl coordination compound

255th National Meeting (2018)

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