How close can you get? Studies of ultrafast light-induced processes in ruthenium-[60] fullerene dyads with short pyrazolino and pyrrolidine links

Susanne Karlsson, Judit Modin, Hans Christian Becker, Leif Hammarström, Helena Grennberg

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

Two pyrazoline- and one pyrrolidine-bridged Ru(II)bipyridine-[60]fullerene dyads have been prepared and studied by ultrafast time-resolved spectroscopy. A silver-assisted synthesis route, in which Ag(I) removes the chlorides from the precursor complex Ru(bpy)2Cl2 facilitates successful coordination of the [60]fullerene-substituted third ligand. Upon light excitation of the ruthenium moiety, the emission was strongly quenched by the fullerene. The main quenching mechanism is an exceptionally fast direct energy transfer (kobs > 1 × 1012 s-1 in the pyrazoline-bridged dyads), resulting in population of the lowest excited triplet state of fullerene. No evidence for electron transfer was found, despite the extraordinarily short donor-acceptor distance that could kinetically favor that process. The observations have implications on the ongoing development of devices built from Ru-polypyridyl complexes and nanostructured carbon, such as C60 or nanotubes.

Original languageEnglish
Pages (from-to)7286-7294
Number of pages9
JournalInorganic Chemistry
Volume47
Issue number16
DOIs
Publication statusPublished - Aug 18 2008

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Fullerenes
Ruthenium
ruthenium
fullerenes
Silver
Excited states
Energy transfer
Nanotubes
Chlorides
Quenching
Carbon
Spectroscopy
Ligands
Electrons
atomic energy levels
nanotubes
electron transfer
energy transfer
quenching
chlorides

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

How close can you get? Studies of ultrafast light-induced processes in ruthenium-[60] fullerene dyads with short pyrazolino and pyrrolidine links. / Karlsson, Susanne; Modin, Judit; Becker, Hans Christian; Hammarström, Leif; Grennberg, Helena.

In: Inorganic Chemistry, Vol. 47, No. 16, 18.08.2008, p. 7286-7294.

Research output: Contribution to journalArticle

Karlsson, Susanne ; Modin, Judit ; Becker, Hans Christian ; Hammarström, Leif ; Grennberg, Helena. / How close can you get? Studies of ultrafast light-induced processes in ruthenium-[60] fullerene dyads with short pyrazolino and pyrrolidine links. In: Inorganic Chemistry. 2008 ; Vol. 47, No. 16. pp. 7286-7294.
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