Time-Resolved EPR study of 3C60 in solid matrices

D.M. MARTINO; C.A. STEREN; H. VAN WILLIGEN

Research Chem. Intermediate Fullerene issue

Año: 1997 vol. 23 p. 415 - 429

Using time resolved cw EPR and pulsed EPR techniques a study was made of the characteristics of the photoexcited triplet state of C60 adsorbed in silica gel pores and embedded in a polymethylmethacrylate matrix. It was found that the time resolved spectra from 3C60 in these matrices at room temperature retain the absorption/emission features of spectra from 3C60 in frozen solution (<120K). Apparently the combination of molecular rotation and pseudo rotation (resulting from interconversion between Jahn-Teller states) is not fast enough to lead to complete averaging of the dipole-dipole interaction between the unpaired electrons.