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ESR, XPS, UV-Vis and FT-IR Investigations On the Interaction of No and O2 With Highly Dispersed C60 Supported On Silica, Titania and Alkali Cation-Exchanged Y-Zeolites

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The characteristics of the radical sources in highly dispersed C60 samples supported on silica, titania and alkali cation-exchanged Y-zeolite were investigated in the presence and absence of NO and O2 by means of ESR, FT-IR and UV-diffuse reflectance spectroscopies, the results of which were compared with those of the bulk C60 sample. In the presence of O2, C60 dispersed onto supports was found to easily generate ESR signals in ambient conditions or under UV-irradiation. The intensity of the ESR signal of the C60 samples were found to strongly depend on the dispersibility of C60, the kind of support and the degassing temperature. Based on these results, the nature of these ESR active species in C60 was discussed in detail for the first time. The addition of NO led to a dramatic decrease in the intensity of the ESR signal, its extent also strongly depending on the kind of support, i.e., silica or Y-zeolite and the exchanged-alkali cations on zeolite, i.e., H+, Na+, Cs+, while such a decrease was not observed for the bulk C60.

Affiliations: 1: Department of Applied Chemistry, College of Engineering, University of Osaka Prefecture, Gakuen-cho 1-1, Sakai, Osaka 593, Japan; 2: Department of Chemistry, Peking University, Beijing, China 100871


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