EXCITED-STATE CHARGE-TRANSFER COMPLEXES FORMED BETWEEN C-60 AND SUBSTITUTED NAPHTHALENES

Solutions of the fullerene C-60 and a substituted naphthalene give ris e to a new absorption band that is not observed from solutions contain ing only C-60 or the naphthalene. The absorption maximum of this new b and successively shifts to a longer wavelength as the ionization poten tial of the naphthalene decreases. These data reflect a C-60-naphthale ne cooperative absorption from a ground-state contact complex to form an excited-state complex with charge-transfer character. This excited- state C-60-naphthalene complex decays to yield the localized C-60 sing let excited state which, in turn, yields the C-60 triplet state with a pproximately unit efficiency.