Nazario Martín

Fullerenes : from synthesis to optoelectronic properties

Preface. 1: Design and Synthesis of C60-based Electroactive Molecules. 1. Addition of azomethyne ylides: fulleropyrrolidines M. Maggini, E. Menna. 2. Synthesis of methanofullerenes for materials science and biological applications J.-F. Nierengarten. 3. New concepts in Diels-Alder cycloadditions to fullerenes N. Martin, et al. 4. Spherical aromaticity an overview Z. Chen, et al. 2: Phytophysical Properties of C60-based Electroactive Molecules. 5. Photoinduced energy transfer processes in functionalized fullerenes N. Armaroli. 6. Electron transfer in functionalized fullerenes P.J. Bracher, D. Schuster. 7. Electron paramagnetic resonance of modified fullerenes C. Corvaja. 8. The small reorganization energy of fullerenes D.M. Guldi. 9. Fullerene electrochemistry L. Echegoyen, M.A. Herranz. 3: Applications of C60-based Electroactive Molecules. 10. Optical limiting applications R. Signorini, et al. 11. Langmuir Blodgett films of C60 and C60-materials L. Valli, D.M. Guldi. 12. Photovoltaic applications M.T. Rispens, J.C. Hummelen. Index.

Donor−Acceptor Conjugates of Lanthanum Endohedral Metallofullerene and π-Extended Tetrathiafulvalene

Stable donor-acceptor conjugates (2, 3) involving an endohedral metallofullerene, La(2)@I(h)-C(80), and pi-extended tetrathiafulvalene (exTTF) have been synthesized by highly regioselective 1,3-dipolar cycloadditions of exTTF-containing azomethine ylides to the endofullerene, yielding exclusively [5,6] metallofulleropyrrolidines with C(1) symmetry in high yields (68-77%). The cyclic voltammograms (CVs) of the conjugates reveal the redox active character of the system due to the presence of both donor and acceptor groups, that is, exTTF and La(2)@I(h)-C(80), respectively. Furthermore, the electrochemically reversible character of the endofullerene confirms the presence of the [5,6] adduct. Despite the relatively close proximity between the exTTF and the endohedral metallofullerene (EMF), only a weak electronic interaction was observed in the ground state, as evidenced by absorption spectroscopy and CV measurements of 2 and 3. On the other hand, in the excited state the fast formation of a radical ion-pair state (i.e., 6.0 x 10(10) s(-1)), that is, the reduction of the electron accepting La(2)@C(80) and the oxidation of exTTF, evolves with lifetimes as long as several ns (3.0 x 10(8) s(-1)) in toluene. Transient absorption spectroscopy experiments confirmed these observations.

Chapter 6:Hydrogen Bonding Donor–Acceptor Carbon Nanostructures

The success of Nature to convert inexpensive, non-polluting and inexhaustible sunlight into energy has stimulated the investigation on the natural photosynthesis in order to emulate it. The photosynthetic process starts with the absorption of light by plants and bacteria and continues with cascades ...