Electrical and optical properties of a potassium (K) -doped film of a hexadecyl chain-linked C 60 ( C60-C16 ) were evaluated by electric conductivity, UV-visible near-IR and Raman spectra. The conductivity of the pristine film (3×10 −7 S cm −1 ) largely increased to 0.1 S cm −1 after doping. The absorption band of C60-C16 anion was observed around 900 nm in the K-doped film. As a result of Raman spectra measurement, it was confirmed that tri- and/or tetra-anions of C60-C16 are formed in the film.
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Chikamatsu et al. (2002) studied this question.