Abstract
The first examples of rodlike donor-photosensitizer-acceptor arrays based on bis-2,6-di(quinolin-8-yl)pyridine RuII complexes 1a and 3a for photoinduced electron transfer have been synthesized and investigated. The complexes are synthesized in a convergent manner and are isolated as linear, single isomers. Time-resolved absorption spectroscopy reveals long-lived, photoinduced charge-separated states (τCSS (1a)=140 ns, τCSS (3a)=200 ns) formed by stepwise electron transfer. The overall yields of charge separation (≥50% for complex 1a and ≥95% for complex 3a) are unprecedented for bis-tridentate RuII polypyridyl complexes. This is attributed to the long-lived excited state of the [Ru(dqp)2]2+ complex combined with fast electron transfer from the donor moiety following the initial charge separation. The rodlike arrangement of donor and acceptor gives controlled, vectorial electron transfer, free from the complications of stereoisomeric diversity. Thus, such arrays provide an excellent system for the study of photoinduced electron transfer and, ultimately, the harvesting of solar energy.
| Original language | English |
|---|---|
| Pages (from-to) | 2830-2842 |
| Number of pages | 13 |
| Journal | Chemistry - A European Journal |
| Volume | 16 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - Mar 1 2010 |
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Keywords
- Donor-acceptor systems
- Electron transfer
- Photochemistry
- Ruthenium
- Tridentate ligands
ASJC Scopus subject areas
- Chemistry(all)
Cite this
Vectorial electron transfer in donor-photosensitizer-acceptor triads based on novel bis-tridentate ruthenium polypyridyl complexes. / Kumar, Rohan J.; Karlsson, Susanne; Streich, Daniel; Jensen, Alice Rolandini; Jäger, Michael; Becker, Hans Christian; Bergquist, Jonas; Johansson, Olof; Hammarström, Leif.
In: Chemistry - A European Journal, Vol. 16, No. 9, 01.03.2010, p. 2830-2842.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Vectorial electron transfer in donor-photosensitizer-acceptor triads based on novel bis-tridentate ruthenium polypyridyl complexes
AU - Kumar, Rohan J.
AU - Karlsson, Susanne
AU - Streich, Daniel
AU - Jensen, Alice Rolandini
AU - Jäger, Michael
AU - Becker, Hans Christian
AU - Bergquist, Jonas
AU - Johansson, Olof
AU - Hammarström, Leif
PY - 2010/3/1
Y1 - 2010/3/1
N2 - The first examples of rodlike donor-photosensitizer-acceptor arrays based on bis-2,6-di(quinolin-8-yl)pyridine RuII complexes 1a and 3a for photoinduced electron transfer have been synthesized and investigated. The complexes are synthesized in a convergent manner and are isolated as linear, single isomers. Time-resolved absorption spectroscopy reveals long-lived, photoinduced charge-separated states (τCSS (1a)=140 ns, τCSS (3a)=200 ns) formed by stepwise electron transfer. The overall yields of charge separation (≥50% for complex 1a and ≥95% for complex 3a) are unprecedented for bis-tridentate RuII polypyridyl complexes. This is attributed to the long-lived excited state of the [Ru(dqp)2]2+ complex combined with fast electron transfer from the donor moiety following the initial charge separation. The rodlike arrangement of donor and acceptor gives controlled, vectorial electron transfer, free from the complications of stereoisomeric diversity. Thus, such arrays provide an excellent system for the study of photoinduced electron transfer and, ultimately, the harvesting of solar energy.
AB - The first examples of rodlike donor-photosensitizer-acceptor arrays based on bis-2,6-di(quinolin-8-yl)pyridine RuII complexes 1a and 3a for photoinduced electron transfer have been synthesized and investigated. The complexes are synthesized in a convergent manner and are isolated as linear, single isomers. Time-resolved absorption spectroscopy reveals long-lived, photoinduced charge-separated states (τCSS (1a)=140 ns, τCSS (3a)=200 ns) formed by stepwise electron transfer. The overall yields of charge separation (≥50% for complex 1a and ≥95% for complex 3a) are unprecedented for bis-tridentate RuII polypyridyl complexes. This is attributed to the long-lived excited state of the [Ru(dqp)2]2+ complex combined with fast electron transfer from the donor moiety following the initial charge separation. The rodlike arrangement of donor and acceptor gives controlled, vectorial electron transfer, free from the complications of stereoisomeric diversity. Thus, such arrays provide an excellent system for the study of photoinduced electron transfer and, ultimately, the harvesting of solar energy.
KW - Donor-acceptor systems
KW - Electron transfer
KW - Photochemistry
KW - Ruthenium
KW - Tridentate ligands
UR - http://www.scopus.com/inward/record.url?scp=77149136051&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=77149136051&partnerID=8YFLogxK
U2 - 10.1002/chem.200902716
DO - 10.1002/chem.200902716
M3 - Article
C2 - 20087914
AN - SCOPUS:77149136051
VL - 16
SP - 2830
EP - 2842
JO - Chemistry - A European Journal
JF - Chemistry - A European Journal
SN - 0947-6539
IS - 9
ER -