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A novel D-pi-A system in which tetrathiafulvalene (TTF) and pi-extended TTFs as strong electron donors are covalently connected to a tricarbonyl [eta(super 6)-arene]chromium complex as the acceptor moiety through a systematically increased conjugated bridge of vinylene units are synthesized by Wittig-Horner olefination reaction.

The synthesis of a new series of electron donor-acceptor conjugates in which the electron acceptor-[C.sub.60]-and the electron donor-[pi]-extended tetrathiafulvalene (exTTF)-are bridged by using m-phenyleneethynylene spacers of variable length is described. AFM spectroscopy is used for showing the ability of these new conjugates to form wirelike structures upon deposition onto a mica surface.

Two new tetrafullerene nanoconjugates consisting of four [C.sub.60] units that are covalently connected through different [pi]-conjugated oligomers (oligo(p-phenylene ethynylene) and oligo(p-phenylene vinylene)) were prepared. Both the nanoconjugates exhibited a very fast deactivation of the singlet excited state of the core unit that produces a mixture of a charge-separated state, involving a radical cation on the [pi]-conjugated oligomer and the fullerene anion at one of the termini.