Light intensity effects on photoinduced charge separation parameters in a molecular triad based on an iridium(III) bis(terpyridine) unit

Lucia Flamigni, Etienne Baranoff, Jean Paul Collin, Jean Pierre Sauvage, Barbara Ventura, Etienne Baranoff

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The effect of photon flux on the yield and lifetime of charge separation over the extreme components of a D-Ir-A triad, where D is a triphenyl amine electron donor, A is a naphthalene bis(imide) electron acceptor and Ir is an Ir9 bis(terpyridine) complex, has been investigated. In usual laboratory conditions, with nanosecond and picosecond laser pulses in the 4-8 mJ range, biphotonic processes take place. Biphotonic products and their evolution can introduce complications in reaction mechanisms and their interpretation but can also drastically reduce the yield and the lifetime of the charge-separated state. In the present case, after discussion of several possible mechanisms, the process detrimental to charge separation is ascribed to absorption of a photon by the photogenerated charge-separated state D+-Ir-A-.

Original languageEnglish
Pages (from-to)1943-1949
Number of pages7
JournalChemPhysChem
Volume8
Issue number13
DOIs
Publication statusPublished - 17 Sep 2007

Keywords

  • Charge separation
  • Electron transfer
  • Iridium
  • Photochemistry
  • Two-photon absorption

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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