HOST-GUEST COMPLEXATION EFFECT ON A C_(60)-PORPHYRIN LIGHT-TO-CURRENT CONVERSION SYSTEM

摘要

Facile preparation of a [60]fullerene-porphyrin bilayer on an ITO glass was achieved for the first time by use of electrostatic alternate adsorption. Unmodified [60]fullerene encapsulated in cationic homooxacalix[3]arcnes and porphyrins sustained by an anionic polymer were used for the [60]fullerene layer and the porphyrin layer, respectively. The spectroscopic studies have established that in these dyad systems photocurrent flows in the order of porphyrin → [60]fullerene units → electrode. The quantitative quantum yield for the best system was estimated to be 21%, which is comparable with the highest quantum yield achieved in the self-assembled monolayer system. On the other hand, it was found that[60] fullerene encapsulated in anionic calix[8]arenes can be readily deposited by electrochemical oxidative polymerization of ethylenedioxythiophene: the resultant electrode generates a photocurrent wave (ca. 100 nA cm~(-2)) in response to visible light irradiation.