ChemInform Abstract: Charge Separation in Carotenoporphyrin‐Quinone Triads: Synthetic, Conformational, and Fluorescence Lifetime Studies.

Gust, Devens; Moore, Thomas A.; Liddell, Paul A.; Nemeth, Gregory A.; Makings, Lewis R.; Moore, Ana L.; Barrett, Donna; Pessiki, Peter J.; Bensasson, René V.; Rougée, Michel; Chachaty, C.; Schryver, F. C. De; Auweraer, Mark Van der; Holzwarth, Alfred R.; Connolly, John S.

doi:10.1002/chin.198724042

Cited by 16 publications

(33 citation statements)

References 1 publication

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“…À state at both 295 and 220 K [11,29]. This suggests that the rate constants for the relevant electron transfer steps are insensitive to the structural difference.…”

mentioning

confidence: 93%

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Increasing the Yield of Photoinduced Charge Separation through Parallel Electron Transfer Pathways

Maniga

Sumida

Stone

et al. 1999

J. Porphyrins Phthalocyanines

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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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“…À state at both 295 and 220 K [11,29]. This suggests that the rate constants for the relevant electron transfer steps are insensitive to the structural difference.…”

mentioning

confidence: 93%

“…The electronic coupling between donor and acceptor moieties has been tuned in order to alter electron transfer rate constants in favorable directions [8,[11][12][13]. The effects of medium (solvent) and temperature have also been investigated [14,15].…”

Section: Introductionmentioning

confidence: 99%

Increasing the Yield of Photoinduced Charge Separation through Parallel Electron Transfer Pathways

Maniga

Sumida

Stone

et al. 1999

J. Porphyrins Phthalocyanines

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show abstract

“…The process will be illustrated with PIQ dyad 1, which consists of a benzoquinone moiety joined to a tetraarylporphyrin via an amide linkage [27]. Excitation of the porphyrin moiety of 1 in dichloromethane solution leads to the series of events depicted in Figure 2.…”

Section: A Simple Covalently Linked Devicesmentioning

confidence: 99%

Mimicking Photosynthetic Electron and Energy Transfer

Gust

Moore

1991

Advances in Photochemistry

100

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“…were obtained as Perchlorates by the reaction of [Co(NH 3 )^H 2 0](C10^) 3 and the sodium salts of the ligands. Recrystallization from acetone yielded analytically pure compounds.…”

Section: Synthesismentioning

confidence: 99%

Intramolecular Excited State Electron Transfer from Naphthalene to Cobalt(III)

Osman

Vogler

1987

Photochemistry and Photophysics of Coordination Compounds

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ChemInform Abstract: Charge Separation in Carotenoporphyrin‐Quinone Triads: Synthetic, Conformational, and Fluorescence Lifetime Studies.

Abstract: A series of tripartite molecules (I)‐(III) and porphyrin‐quinone analogues (IV) has been synthesized (described in schemes, no details or yields given) in order to investigate the effect of structure on the yield and lifetime of the charge‐separated state.

Cited by 16 publications

References 1 publication

Increasing the Yield of Photoinduced Charge Separation through Parallel Electron Transfer Pathways

Increasing the Yield of Photoinduced Charge Separation through Parallel Electron Transfer Pathways

Mimicking Photosynthetic Electron and Energy Transfer

Intramolecular Excited State Electron Transfer from Naphthalene to Cobalt(III)

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