How Close Can You Get?: Studies of Ultrafast Light-Induced Processes in Ruthenium- Fullerene Dyads with Short Pyrazolino and Pyrrolidino Links
2008 (English)In: Inorganic Chemistry, ISSN 0020-1669, Vol. 47, no 16, 7286-7294 p.Article in journal (Refereed) Published
Two pyrazoline- and one pyrrolidine-bridged Ru(II)bipyridine-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)(2)Cl-2 facilitates successful coordination of the 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 (k(obs) > , 1 x 10(12) 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 C-60 or nanotubes.
Place, publisher, year, edition, pages
2008. Vol. 47, no 16, 7286-7294 p.
Other Basic Medicine
Research subject Organic Chemistry
IdentifiersURN: urn:nbn:se:uu:diva-87346DOI: 10.1021/ic800168dISI: 000258332900030OAI: oai:DiVA.org:uu-87346DiVA: diva2:37540