EPR study of the H2O2 interaction with TiO2; evidence for a novel S = 1 surface radical pair

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Damien M. Murphy, Emyr W. Griffiths, Christopher C. Rowlands, Damien M. Murphy, Fred E. Hancock and Elio Giamello


Abstract

H2O2 reacts with rutile TiO2 powder forming not only surface O2 anions but also two newly identified surface S = 1 triplet radical anion pairs composed of two interacting O···O centers characterised by the EPR spin Hamiltonian parameters of giso = 2.0104 and D = 13.7 mT for triplet 1 and giso = 2.0064 and D = 12.7 mT for triplet 2.


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