Abstract
Photochemical reactions between the excited triplet state of C60 and the ion-pair charge-transfer complex which consists of electron-acceptor cation (methyl viologen (MV2)) and electron-donor anion (organo borates (~BPh3R, where R = Ph or Bu)) have been investigated by both steady-state and laser-flash photolysis. By photoirradiation of CM in the presence of MV2(-BPh3R)2 in organic solvents, the amount of MV+ increases with irradiation time, and persists for a long time even in the dark. From the laser-flash photolysis, it is found that electron transfer proceeds via 3C60 from -BPh3R in the complex, yielding ·BPh3R and C60-. Although generated Cr does not decay in the absence of MV2+ because of the rapid dissociation of BPh3R, in the presence of MV2+, C60- decays quickly by transferring an electron to MV2+ yielding MV+. Thus, it is proved that Ceo acts as a photosensitizer for pumping up an electron from -BPh3R as well as an electron mediator to MV2+. In these systems, MV+ persists even in air-saturated solution for more than an hour, suggesting that the electron transfer from MV+ to O2 is retarded.
| Original language | English |
|---|---|
| Pages (from-to) | 9938-9942 |
| Number of pages | 5 |
| Journal | Journal of Physical Chemistry A |
| Volume | 103 |
| Issue number | 48 |
| Publication status | Published - 1999 Dec 2 |
| Externally published | Yes |
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ASJC Scopus subject areas
- Physical and Theoretical Chemistry
Cite this
COG as photosensitizing electron-transfer mediator for ion-pair charge-transfer complexes between borate anions and methyl viologen dication. / Konishi, Toshifumi; Fujitsuka, Mamoru; Ito, Osamu; Toba, Yasumasa; Usui, Yoshiharu.
In: Journal of Physical Chemistry A, Vol. 103, No. 48, 02.12.1999, p. 9938-9942.Research output: Contribution to journal › Article
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TY - JOUR
T1 - COG as photosensitizing electron-transfer mediator for ion-pair charge-transfer complexes between borate anions and methyl viologen dication
AU - Konishi, Toshifumi
AU - Fujitsuka, Mamoru
AU - Ito, Osamu
AU - Toba, Yasumasa
AU - Usui, Yoshiharu
PY - 1999/12/2
Y1 - 1999/12/2
N2 - Photochemical reactions between the excited triplet state of C60 and the ion-pair charge-transfer complex which consists of electron-acceptor cation (methyl viologen (MV2)) and electron-donor anion (organo borates (~BPh3R, where R = Ph or Bu)) have been investigated by both steady-state and laser-flash photolysis. By photoirradiation of CM in the presence of MV2(-BPh3R)2 in organic solvents, the amount of MV+ increases with irradiation time, and persists for a long time even in the dark. From the laser-flash photolysis, it is found that electron transfer proceeds via 3C60 from -BPh3R in the complex, yielding ·BPh3R and C60-. Although generated Cr does not decay in the absence of MV2+ because of the rapid dissociation of BPh3R, in the presence of MV2+, C60- decays quickly by transferring an electron to MV2+ yielding MV+. Thus, it is proved that Ceo acts as a photosensitizer for pumping up an electron from -BPh3R as well as an electron mediator to MV2+. In these systems, MV+ persists even in air-saturated solution for more than an hour, suggesting that the electron transfer from MV+ to O2 is retarded.
AB - Photochemical reactions between the excited triplet state of C60 and the ion-pair charge-transfer complex which consists of electron-acceptor cation (methyl viologen (MV2)) and electron-donor anion (organo borates (~BPh3R, where R = Ph or Bu)) have been investigated by both steady-state and laser-flash photolysis. By photoirradiation of CM in the presence of MV2(-BPh3R)2 in organic solvents, the amount of MV+ increases with irradiation time, and persists for a long time even in the dark. From the laser-flash photolysis, it is found that electron transfer proceeds via 3C60 from -BPh3R in the complex, yielding ·BPh3R and C60-. Although generated Cr does not decay in the absence of MV2+ because of the rapid dissociation of BPh3R, in the presence of MV2+, C60- decays quickly by transferring an electron to MV2+ yielding MV+. Thus, it is proved that Ceo acts as a photosensitizer for pumping up an electron from -BPh3R as well as an electron mediator to MV2+. In these systems, MV+ persists even in air-saturated solution for more than an hour, suggesting that the electron transfer from MV+ to O2 is retarded.
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M3 - Article
VL - 103
SP - 9938
EP - 9942
JO - Journal of Physical Chemistry A
JF - Journal of Physical Chemistry A
SN - 1089-5639
IS - 48
ER -