Photoinduced charge separation and charge recombination of fullerene bearing dendritic poly(amidoamine) with carboxylates at the terminal in aqueous media

2005 ◽  
pp. 5160 ◽  
Author(s):  
Atula S. D. Sandanayaka ◽  
Huimin Zhang ◽  
Yutaka Takaguchi ◽  
Yuuki Sako ◽  
Mitsuhiro Tamura ◽  
...  
2019 ◽  
Vol 21 (8) ◽  
pp. 4387-4393 ◽  
Author(s):  
Lorenzo Cupellini ◽  
Paweł Wityk ◽  
Benedetta Mennucci ◽  
Janusz Rak

Neither the rates of photoinduced charge separation nor charge recombination account for the substantial damage observed in the 5′-ABrU sequence.


2014 ◽  
Vol 136 (37) ◽  
pp. 12966-12973 ◽  
Author(s):  
Duoduo Bao ◽  
Srigokul Upadhyayula ◽  
Jillian M. Larsen ◽  
Bing Xia ◽  
Boriana Georgieva ◽  
...  

2006 ◽  
Vol 79 (12) ◽  
pp. 1860-1868 ◽  
Author(s):  
Mamoru Fujitsuka ◽  
Takashi Makinoshima ◽  
Atushi Takamizawa ◽  
Yasuyuki Araki ◽  
Osamu Ito ◽  
...  

2000 ◽  
Vol 122 (12) ◽  
pp. 2889-2902 ◽  
Author(s):  
Frederick D. Lewis ◽  
Taifeng Wu ◽  
Xiaoyang Liu ◽  
Robert L. Letsinger ◽  
Scott R. Greenfield ◽  
...  

1997 ◽  
Vol 119 (6) ◽  
pp. 1400-1405 ◽  
Author(s):  
Paul A. Liddell ◽  
Darius Kuciauskas ◽  
John P. Sumida ◽  
Boaz Nash ◽  
Dorothy Nguyen ◽  
...  

2004 ◽  
Vol 108 (52) ◽  
pp. 19995-20004 ◽  
Author(s):  
Atula S. D. Sandanayaka ◽  
Kyohei Matsukawa ◽  
Tsutomu Ishi-i ◽  
Shuntaro Mataka ◽  
Yasuyuki Araki ◽  
...  

Author(s):  
NYANGENYA I. MANIGA ◽  
JOHN P. SUMIDA ◽  
SIMON STONE ◽  
ANA L. MOORE ◽  
THOMAS A. MOORE ◽  
...  

A strategy for increasing the yield of long-lived photoinduced charge separation in artificial photosynthetic reaction centers which is based on multiple electron transfer pathways operating in parallel has been investigated. Excitation of the porphyrin moiety of a carotenoid ( C )–porphyrin ( P )–naphthoquinone (Q) molecular triad leads to the formation of a charge-separated state C ·+– P – Q ·− with an overall quantum yield of 0.044 in benzonitrile solution. Photoinduced electron transfer from the porphyrin first excited singlet state gives C – P ·+– Q ·− with a quantum yield of ~1.0. However, electron transfer from the carotenoid to the porphyrin radical cation to form the final state does not compete well with charge recombination of C – P ·+– Q ·−, reducing the yield. The related pentad C 3– P – Q features carotenoid, porphyrin and quinone moieties closely related to those in the triad. Excitation of this molecule gives a C ·+– P ( C 2)– Q ·− state with a quantum yield of 0.073. The enhanced yield is ascribed to the fact that three electron donation pathways operating in parallel compete with charge recombination. The yield does not increase by the statistically predicted factor of three owing to small differences in thermodynamic driving force between the two compounds.


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