Ruthenium polypyridyl complexes have been historically studied for their rich electron transfer and excited state properties.  We have been interested in manipulating these properties through ligand modifications, specifically acid/base dependent substituents.  Notably, the 4,4’-dihydroxy-2,2’-bipyridine ligand contains two deprotonatable hydroxyl groups that significantly alter the electronic properties of the ruthenium metal center upon deprotonation of the complex. Deprotonation adds electron-donating characteristics to the ligand and lowers the energy of Ru<sup>II/III</sup> oxidation.  These properties can lead to the potential for controlling redox catalysis using pH as an on/off switch.  Therefore, understanding the excited state properties of these ruthenium complexes as a function of pH is of great interest to gain insight into ideal ligand design for potential catalysts.  The pH-dependent emission, including quantum yields and excited state pK<sub>a</sub> values, of ruthenium complexes containing hydroxyl-substituted polypyridyl ligands will be reported.

Excited state emission of ruthenium complexes containing pH-dependent ligands

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.