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 x 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.