Abstract
The synthesis and characterization of six ruthenium(II) bistridentate polypyridyl complexes is described. These were designed on the basis of a new approach to increase the excited-state lifetime of ruthenium(II) bisterpyridine-type complexes. By the use of a bipyridylpyridyl methane ligand in place of terpyridine, the coordination environment of the metal ion becomes nearly octahedral and the rate of deactivation via ligand-field (i.e., metal-centered) states was reduced as shown by temperature-dependent emission lifetime studies. Still, the possibility to make quasilinear donor-ruthenium-acceptor triads is maintained in the complexes. The most promising complex shows an excited-state lifetime of τ = 15 ns in alcohol solutions at room temperature, which should be compared to a lifetime of τ = 0.25 ns for [Ru(tpy)2]2+. The X-ray structure of the new complex indeed shows a more octahedral geometry than that of [Ru(tpy) 2]2+. Most importantly, the high excited-state energy was retained, and thus, so was the potential high reactivity of the excited complex, which has not been the case with previously published strategies based on bistridentate complexes.
| Original language | English |
|---|---|
| Pages (from-to) | 3215-3225 |
| Number of pages | 11 |
| Journal | Inorganic Chemistry |
| Volume | 44 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - May 2 2005 |
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ASJC Scopus subject areas
- Inorganic Chemistry
Cite this
A new strategy for the improvement of photophysical properties in ruthenium(II) polypyridyl complexes. Synthesis and photophysical and electrochemical characterization of six mononuclear ruthenium(II) bisterpyridine-type complexes. / Abrahamsson, Maria; Wolpher, Henriette; Johansson, Olof; Larsson, Jan; Kritikos, Mikael; Eriksson, Lars; Norrby, Per Ola; Bergquist, Jonas; Sun, Licheng; Åkermark, Björn; Hammarström, Leif.
In: Inorganic Chemistry, Vol. 44, No. 9, 02.05.2005, p. 3215-3225.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - A new strategy for the improvement of photophysical properties in ruthenium(II) polypyridyl complexes. Synthesis and photophysical and electrochemical characterization of six mononuclear ruthenium(II) bisterpyridine-type complexes
AU - Abrahamsson, Maria
AU - Wolpher, Henriette
AU - Johansson, Olof
AU - Larsson, Jan
AU - Kritikos, Mikael
AU - Eriksson, Lars
AU - Norrby, Per Ola
AU - Bergquist, Jonas
AU - Sun, Licheng
AU - Åkermark, Björn
AU - Hammarström, Leif
PY - 2005/5/2
Y1 - 2005/5/2
N2 - The synthesis and characterization of six ruthenium(II) bistridentate polypyridyl complexes is described. These were designed on the basis of a new approach to increase the excited-state lifetime of ruthenium(II) bisterpyridine-type complexes. By the use of a bipyridylpyridyl methane ligand in place of terpyridine, the coordination environment of the metal ion becomes nearly octahedral and the rate of deactivation via ligand-field (i.e., metal-centered) states was reduced as shown by temperature-dependent emission lifetime studies. Still, the possibility to make quasilinear donor-ruthenium-acceptor triads is maintained in the complexes. The most promising complex shows an excited-state lifetime of τ = 15 ns in alcohol solutions at room temperature, which should be compared to a lifetime of τ = 0.25 ns for [Ru(tpy)2]2+. The X-ray structure of the new complex indeed shows a more octahedral geometry than that of [Ru(tpy) 2]2+. Most importantly, the high excited-state energy was retained, and thus, so was the potential high reactivity of the excited complex, which has not been the case with previously published strategies based on bistridentate complexes.
AB - The synthesis and characterization of six ruthenium(II) bistridentate polypyridyl complexes is described. These were designed on the basis of a new approach to increase the excited-state lifetime of ruthenium(II) bisterpyridine-type complexes. By the use of a bipyridylpyridyl methane ligand in place of terpyridine, the coordination environment of the metal ion becomes nearly octahedral and the rate of deactivation via ligand-field (i.e., metal-centered) states was reduced as shown by temperature-dependent emission lifetime studies. Still, the possibility to make quasilinear donor-ruthenium-acceptor triads is maintained in the complexes. The most promising complex shows an excited-state lifetime of τ = 15 ns in alcohol solutions at room temperature, which should be compared to a lifetime of τ = 0.25 ns for [Ru(tpy)2]2+. The X-ray structure of the new complex indeed shows a more octahedral geometry than that of [Ru(tpy) 2]2+. Most importantly, the high excited-state energy was retained, and thus, so was the potential high reactivity of the excited complex, which has not been the case with previously published strategies based on bistridentate complexes.
UR - http://www.scopus.com/inward/record.url?scp=19944395203&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=19944395203&partnerID=8YFLogxK
U2 - 10.1021/ic048247a
DO - 10.1021/ic048247a
M3 - Article
C2 - 15847430
AN - SCOPUS:19944395203
VL - 44
SP - 3215
EP - 3225
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 9
ER -