title: Porphyrin-phthalocyanine/pyridylfullerene supramolecular assemblies.
abstract: The synthesis and photophysical properties of several porphyrin (P)-phthalocyanine (Pc) conjugates (P-Pc; 1-3) are described, in which the phthalocyanines are directly linked to the β-pyrrolic position of a meso-tetraphenylporphyrin. Photoinduced energy- and electron-transfer processes were studied through the preparation of H(2)P-ZnPc, ZnP-ZnPc, and PdP-ZnPc conjugates, and their assembly through metal coordination with two different pyridylfulleropyrrolidines (4 and 5). The resulting electron-donor-acceptor hybrids, which were formed by axial coordination of compounds 4 and 5 with the corresponding phthalocyanines, mimicked the fundamental processes of photosynthesis; that is, light harvesting, the transduction of excited-state energy, and unidirectional electron transfer. In particular, photophysical studies confirmed that intramolecular energy-transfer resulted from the S(2) excited state as well as from the S(1) excited state of the porphyrins to the energetically lower-lying phthalocyanines, followed by an intramolecular charge-transfer to yield P-Pc(.+)⋅C(60)(.-). This unique sequence of processes opens the way for solar-energy-conversion processes.
authors.affiliation: Departamento de Química e QOPNA, Universidade de Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: Ana M V M
authors.initials: AM
authors.lastname: Pereira
authors.forename: Anita
authors.initials: A
authors.lastname: Hausmann
authors.forename: Ana R M
authors.initials: AR
authors.lastname: Soares
authors.forename: João P C
authors.initials: JP
authors.lastname: Tomé
authors.forename: Olga
authors.initials: O
authors.lastname: Trukhina
authors.forename: Maxence
authors.initials: M
authors.lastname: Urbani
authors.forename: Maria G P M S
authors.initials: MG
authors.lastname: Neves
authors.forename: José A S
authors.initials: JA
authors.lastname: Cavaleiro
authors.forename: Dirk M
authors.initials: DM
authors.lastname: Guldi
authors.forename: Tomás
authors.initials: T
authors.lastname: Torres
mesh_terms: D004579:Electron Transport; D037741:Fullerenes / Q000737:chemistry*; D007211:Indoles / Q000138:chemical synthesis / Q000737:chemistry*; D054833:Isoindoles; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D055668:Photochemical Processes; D011166:Porphyrins / Q000138:chemical synthesis / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D013050:Spectrometry, Fluorescence
chemical_list: D037741:Fullerenes; D007211:Indoles; D054833:Isoindoles; D011166:Porphyrins; D011725:Pyridines; C013647:phthalocyanine