PHOTOINDUCED ELECTRON-TRANSFER AND LONG-LIVED CHARGE SEPARATION IN A DONOR-BRIDGE-ACCEPTOR SUPRAMOLECULAR DIAD CONSISTING OF RUTHENIUM(II) TRIS(BIPYRIDINE) FUNCTIONALIZED C-60

Evidence for photoinduced electron transfer from the excited state of ruthenium(II) tris(bipyridine) to buckminster-fullerene, C-60 in a cov alently bound donor-bridge-acceptor supramolecule is reported, Photoin duced optical absorption (PIA) studies clearly show an excitation spec trum with a long lived PIA band at 688 nm assigned to the absorption b and of the ruthenium(III) tris(bipyridine). A photoinduced electron sp in resonance signal exhibits signatures of both tile ruthenium(III) tr is(bipyridine) and the C-60 radical anion. From the quenching of the p hotoluminescence a rate constant of 6.4 x 10(6) s(-1) is estimated for the photoinduced electron transfer in acetonitrile solutions at 296 K .