A paper from the Pinkhassik Group was featured on the cover of Chemical Communications. Drs. Sergey Dergunov and Eugene Pinkhassik -- working with collaborators from Saint Louis University -- uncovered evidence for freely diffusing ground-state atomic oxygen, an elusive species whose existence in solution was proposed by never proven. This study used hollow porous nanocapsules developed in the Pinkhassik Group to physically separate the donor and acceptor of an oxygen atom. Photochemical reactions in the presence of a nanometer-thin porous barrier ruled out direct oxygen atom transfer mechanisms and, for the first time, confirmed the formation of diffusing atomic oxygen. Previously produced in the gas phase, atomic oxygen is an extraordinary reactive oxygen species; it is highly reactive like hydroxyl radical, yet selective like singlet oxygen or ozone. Evidence for atomic oxygen in solution provides new insights into the mechanisms of many oxidation reactions, facilitates the search for synthetically viable sources of atomic oxygen, and lays the groundwork for studying the controlled release of small oxidants from photoactivatable precursors.
For further details, read the paper in ChemComm