Identity of transients formed from chlorinated fullerenes in organic solvents: a pulse radiolysis study

Abstract

The UV-vis absorption spectra of chlorinated fullerenes (C₆₀Cl₆, C₆₀Cl₁₂) in cyclohexane exhibit bands with λ _max = 210 and 255 and shoulders at 275 and 385 nm. The sharpness and molar absorptivity decrease with increase in the number of chlorine atoms. Pulse radiolysis studies of these chlorinated fullerenes were carried out in benzene, 1,2-dichloroethane, and cyclohexane. In benzene, the triplets of chlorinated fullerenes were observed. The radical cations of chlorinated fullerenes, generated in 1,2-dichloroethane, exhibit absorption bands with λ _max = 400 nm for C₆₀Cl₁₂ and 380 nm for C₆₀Cl₆. In cyclohexane, a slow forming transient at λ _max = 430 nm for C₆₀Cl₁₂ and 370 nm for C₆₀Cl₆ was generated. These bands appear to be different from the triplet and parent radical cation.