Abstract
Luminescence of the rhenium tricarbonyl complex bearing a cyclodextrin unit on a ligand (1) was quenched by the diphenylamine-4-sulfonic acid included in the cavity of the cyclodextrin unit. The origin of the quenching was attributed to the electron transfer from the amine to the triplet metal-to-ligand charge transfer (MLCT) state of the rhenium complex unit. The rate of the forward electron transfer was estimated at 6.2 × 107 s-1 on the basis of the luminescence lifetime for the inclusion complex. Charge separation after the photoinduced electron transfer was verified by the observation of the transient absorption for the charge separation products. Most of the charge separation products were generated in the electron transfer process within the inclusion complex, which was proven by a large decrease in the yield of the products on the addition of a competitive guest for the cyclodextrin cavity, 1-adamantanol. The rate of the back electron transfer was estimated by the decay of the transient absorption at 4.4 × 104 s-1. Both of the rates for forward and back electron transfer were by far slower than those for a covalently-linked aniline-rhenium complex molecule.
| Original language | English |
|---|---|
| Pages (from-to) | 159-165 |
| Number of pages | 7 |
| Journal | Journal of Electroanalytical Chemistry |
| Volume | 438 |
| Issue number | 1-2 |
| Publication status | Published - 1997 Nov 25 |
| Externally published | Yes |
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Keywords
- Charge separation
- Cyclodextrin
- Inclusion complex
- Rhenium tricarbonyl complex
- Supramolecules
ASJC Scopus subject areas
- Chemical Engineering(all)
- Analytical Chemistry
- Electrochemistry
Cite this
Charge separation in the non-covalent adducts of aromatic amines and the rhenium tricarbonyl complex bearing a cyclodextrin unit on a ligand. / Nakamura, Asao; Imai, Takashi; Oda, Yuji; Okutsu, Satoshi; Ueno, Akihiko; Toda, Fujio.
In: Journal of Electroanalytical Chemistry, Vol. 438, No. 1-2, 25.11.1997, p. 159-165.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Charge separation in the non-covalent adducts of aromatic amines and the rhenium tricarbonyl complex bearing a cyclodextrin unit on a ligand
AU - Nakamura, Asao
AU - Imai, Takashi
AU - Oda, Yuji
AU - Okutsu, Satoshi
AU - Ueno, Akihiko
AU - Toda, Fujio
PY - 1997/11/25
Y1 - 1997/11/25
N2 - Luminescence of the rhenium tricarbonyl complex bearing a cyclodextrin unit on a ligand (1) was quenched by the diphenylamine-4-sulfonic acid included in the cavity of the cyclodextrin unit. The origin of the quenching was attributed to the electron transfer from the amine to the triplet metal-to-ligand charge transfer (MLCT) state of the rhenium complex unit. The rate of the forward electron transfer was estimated at 6.2 × 107 s-1 on the basis of the luminescence lifetime for the inclusion complex. Charge separation after the photoinduced electron transfer was verified by the observation of the transient absorption for the charge separation products. Most of the charge separation products were generated in the electron transfer process within the inclusion complex, which was proven by a large decrease in the yield of the products on the addition of a competitive guest for the cyclodextrin cavity, 1-adamantanol. The rate of the back electron transfer was estimated by the decay of the transient absorption at 4.4 × 104 s-1. Both of the rates for forward and back electron transfer were by far slower than those for a covalently-linked aniline-rhenium complex molecule.
AB - Luminescence of the rhenium tricarbonyl complex bearing a cyclodextrin unit on a ligand (1) was quenched by the diphenylamine-4-sulfonic acid included in the cavity of the cyclodextrin unit. The origin of the quenching was attributed to the electron transfer from the amine to the triplet metal-to-ligand charge transfer (MLCT) state of the rhenium complex unit. The rate of the forward electron transfer was estimated at 6.2 × 107 s-1 on the basis of the luminescence lifetime for the inclusion complex. Charge separation after the photoinduced electron transfer was verified by the observation of the transient absorption for the charge separation products. Most of the charge separation products were generated in the electron transfer process within the inclusion complex, which was proven by a large decrease in the yield of the products on the addition of a competitive guest for the cyclodextrin cavity, 1-adamantanol. The rate of the back electron transfer was estimated by the decay of the transient absorption at 4.4 × 104 s-1. Both of the rates for forward and back electron transfer were by far slower than those for a covalently-linked aniline-rhenium complex molecule.
KW - Charge separation
KW - Cyclodextrin
KW - Inclusion complex
KW - Rhenium tricarbonyl complex
KW - Supramolecules
UR - http://www.scopus.com/inward/record.url?scp=0031270749&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031270749&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0031270749
VL - 438
SP - 159
EP - 165
JO - Journal of Electroanalytical Chemistry
JF - Journal of Electroanalytical Chemistry
SN - 0022-0728
IS - 1-2
ER -