Energy Migration in a Self-Assembled Nonameric Porphyrinic Molecular Box (Articolo in rivista)

Type
Label
  • Energy Migration in a Self-Assembled Nonameric Porphyrinic Molecular Box (Articolo in rivista) (literal)
Anno
  • 2008-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1002/chem.200800026 (literal)
Alternative label
  • L. Flamigni; B. Ventura; A. I. Oliva; P. Ballester (2008)
    Energy Migration in a Self-Assembled Nonameric Porphyrinic Molecular Box
    in Chemistry (Weinh., Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • L. Flamigni; B. Ventura; A. I. Oliva; P. Ballester (literal)
Pagina inizio
  • 4214 (literal)
Pagina fine
  • 4224 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 14 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 14 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. CNR, Ist ISOF, I-40129 Bologna, Italy 2. Inst Chem Res Catalonia ICIQ, Tarragona 43007, Spain 3. Catalan Inst Res & Adv Studies ICREA, Tarragona 43007, Spain (literal)
Titolo
  • Energy Migration in a Self-Assembled Nonameric Porphyrinic Molecular Box (literal)
Abstract
  • We describe the construction of self-assembled double-decker porphyrin arrays built up from two covalently connected trimeric Zn-porphyrin units that are joined together by metal-coordination bonds with diamine ligands. We used three different types of diamine ligands: 1,4-diaza[2.2.2]bi-cyclooctane (DABCO), 4,4'-bipyridine (BIPY), and 5,15-bis(4-pyridyl)-10,20-diphenylporphyrin (DPYP). The ligands act as pillars, through two axial coordination bonds with the porphyrinic (ZnI)-I-I ions, to block the planes of the porphyrin units in an almost cofacial orientation and inducing the formation of a trigonal prismatic structure. The spectroscopic and photophysical properties of the Zn-trisporphyrin component were determined as well as those of the resulting multimolecular cage-like assemblies. The double-decker assembly with DPYP as the pillars constitutes a nonameric porphyrin aggregate. Although this assembly is thermodynamically less stable than those containing DABCO or BIPY, efficient photoinduced energy transfer occurs (96% yield) from the trisporphyrin base units to the DPYP side walls. The rate of the energy-transfer process is in good agreement with that calculated for a dipole-dipole (Forster) mechanism corrected for the unfavorable orientation geometry of the donor and the axially bound acceptor. (literal)
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