Stepwise sequential and parallel photoinduced charge separation in a porphyrin-triquinone tetrad

被引:29
作者
Springer, J [1 ]
Kodis, G [1 ]
de la Garza, L [1 ]
Moore, AL [1 ]
Moore, TA [1 ]
Gust, D [1 ]
机构
[1] Arizona State Univ, Ctr Study Early Events Photosynthesis, Dept Chem & Biochem, Tempe, AZ 85287 USA
关键词
D O I
10.1021/jp022424g
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A molecular tetrad consisting of a free base porphyrin (P) linked to a triquinone moiety consisting of a naphthoquinone bearing two benzoquinones (NQ-BQ(2)) has been synthesized and its photochemistry has been investigated using time-resolved spectroscopic techniques. Excitation of the porphyrin chromophore of the P-NQ-BQ(2) tetrad in benzonitrile solution is followed by photoinduced electron transfer with a rate constant of 8.3 x 10(10) s(-1) to produce an initial P.+-NQ(.-)-BQ(2) state with a quantum yield of unity. A charge shift reaction gives a final P.+-NQ-(BQ(.-)-BQ) charge-separated state, which decays to the ground state with a rate constant of 1.9 x 10(11) s(-1). The tetrad features both sequential and parallel multistep electron-transfer pathways. No evidence was found for significant involvement of direct electron transfer from the porphyrin first excited singlet state to a benzoquinone.
引用
收藏
页码:3567 / 3575
页数:9
相关论文
共 32 条
  • [21] Efficient energy transfer and electron transfer in an artificial photosynthetic antenna-reaction center complex
    Kodis, G
    Liddell, PA
    de la Garza, L
    Clausen, PC
    Lindsey, JS
    Moore, AL
    Moore, TA
    Gust, D
    [J]. JOURNAL OF PHYSICAL CHEMISTRY A, 2002, 106 (10) : 2036 - 2048
  • [22] Photoinduced intramolecular electron transfer in covalently linked porphyrin-triptycene-(bis)quinone diads and triads
    Korth, O
    Wiehe, A
    Kurreck, H
    Röder, B
    [J]. CHEMICAL PHYSICS, 1999, 246 (1-3) : 363 - 372
  • [23] Structural effects on photoinduced electron transfer in carotenoid-porphyrin-quinone triads
    Kuciauskas, D
    Liddell, PA
    Hung, SC
    Lin, S
    Stone, S
    Seely, GR
    Moore, AL
    Moore, TA
    Gust, D
    [J]. JOURNAL OF PHYSICAL CHEMISTRY B, 1997, 101 (03) : 429 - 440
  • [24] Liddell PA, 2001, HELV CHIM ACTA, V84, P2765, DOI 10.1002/1522-2675(20010919)84:9<2765::AID-HLCA2765>3.0.CO
  • [25] 2-S
  • [27] Electron transfer reactions in chemistry. Theory and experiment
    Marcus, RA
    [J]. PURE AND APPLIED CHEMISTRY, 1997, 69 (01) : 13 - 29
  • [28] A NEW MODEL FOR THE STUDY OF MULTISTEP ELECTRON-TRANSFER IN PHOTOSYNTHESIS
    NISHITANI, S
    KURATA, N
    SAKATA, Y
    MISUMI, S
    KAREN, A
    OKADA, T
    MATAGA, N
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1983, 105 (26) : 7771 - 7772
  • [29] ELECTRON-TRANSFER PROCESSES .26. RADICAL-ANIONS OF TRIPTYCENE BIS(QUINONES) AND TRIS(QUINONES)
    RUSSELL, GA
    SULEMAN, NK
    IWAMURA, H
    WEBSTER, OW
    [J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1981, 103 (06) : 1560 - 1561
  • [30] Control of electron transfer and its utilization
    Sakata, Y
    Imahori, H
    Tsue, H
    Higashida, S
    Akiyama, T
    Yoshizawa, E
    Aoki, M
    Yamada, K
    Hagiwara, K
    Taniguchi, S
    Okada, T
    [J]. PURE AND APPLIED CHEMISTRY, 1997, 69 (09) : 1951 - 1956