Published Research - Department of Chemistry


Date of this Version



Published in Chemical Physics 354 (2008), pp. 174–179; doi:10.1016/j.chemphys.2008.10.014


Copyright © 2008 Elsevier B.V. Used by permission.


Spectroscopic and chemical properties of γ-CD radicals, resulting from the abstraction by HO radicals of hydrogen atoms, have been investigated using pulse radiolysis. The reactions of γ-CD radicals with C60 in 2:1 γ-CD/C60 inclusion complexes have been studied in aqueous solutions. It has been demonstrated that the γ-CD_ radicals are reducing species producing C60•— monoanion radicals, as well as doubly reduced C602— , well characterized by their absorption spectra in the near IR. The oxidation potential of γ-CD radical is estimated to be more negative than –390 mV vs. NHE. The kinetics of the C60 reduction by γ-CD radicals have been determined and compared with kinetics by other reducing species including the solvated electron (eaq) and CO2•— radicals. It was observed that the method of preparation of the 2:1 γ-CD/C60 inclusion complexes modifies the C60 reduction mechanism.