Proton-assisted photoinduced electron transfer from porphyrin to quinone: A photo-CIDNP and laser flash photolysis study

Devens Gust; Thomas Moore; Ana Moore; Xiaochun C. Ma; Ronald A. Nieman; Gilbert R. Seely; Robert E. Belford; Jeffery E. Lewis

doi:10.1021/j100164a052

Proton-assisted photoinduced electron transfer from porphyrin to quinone: A photo-CIDNP and laser flash photolysis study

Devens Gust, Thomas Moore, Ana Moore, Xiaochun C. Ma, Ronald A. Nieman, Gilbert R. Seely, Robert E. Belford, Jeffery E. Lewis

Molecular Sciences, School of (SMS)

Research output: Contribution to journal › Article › peer-review

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Abstract

The mechanism of proton-assisted photoinduced electron transfer from porphyrins to quinones has been investigated by a combination of NMR, photo-CIDNP, laser flash photolysis, and UV-vis absorption techniques. In aromatic solvents containing trifluoroacetic acid, the electron-donor species was found to be the triplet state of the porphyrin dication rather than that of the free-base porphyrin itself. In addition, reaction of the porphyrin dication triplet state with the protonated quinone species QH⁺, rather than Q, was found to be responsible for the observed electron transfer and the resulting CIDNP signals.

Original language	English (US)
Pages (from-to)	4442-4445
Number of pages	4
Journal	Journal of physical chemistry
Volume	95
Issue number	11
DOIs	https://doi.org/10.1021/j100164a052
State	Published - 1991

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Physical and Theoretical Chemistry

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title = "Proton-assisted photoinduced electron transfer from porphyrin to quinone: A photo-CIDNP and laser flash photolysis study",

abstract = "The mechanism of proton-assisted photoinduced electron transfer from porphyrins to quinones has been investigated by a combination of NMR, photo-CIDNP, laser flash photolysis, and UV-vis absorption techniques. In aromatic solvents containing trifluoroacetic acid, the electron-donor species was found to be the triplet state of the porphyrin dication rather than that of the free-base porphyrin itself. In addition, reaction of the porphyrin dication triplet state with the protonated quinone species QH+, rather than Q, was found to be responsible for the observed electron transfer and the resulting CIDNP signals.",

author = "Devens Gust and Thomas Moore and Ana Moore and Ma, {Xiaochun C.} and Nieman, {Ronald A.} and Seely, {Gilbert R.} and Belford, {Robert E.} and Lewis, {Jeffery E.}",

year = "1991",

doi = "10.1021/j100164a052",

language = "English (US)",

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T1 - Proton-assisted photoinduced electron transfer from porphyrin to quinone

T2 - A photo-CIDNP and laser flash photolysis study

AU - Gust, Devens

AU - Moore, Thomas

AU - Moore, Ana

AU - Ma, Xiaochun C.

AU - Nieman, Ronald A.

AU - Seely, Gilbert R.

AU - Belford, Robert E.

AU - Lewis, Jeffery E.

PY - 1991

Y1 - 1991

N2 - The mechanism of proton-assisted photoinduced electron transfer from porphyrins to quinones has been investigated by a combination of NMR, photo-CIDNP, laser flash photolysis, and UV-vis absorption techniques. In aromatic solvents containing trifluoroacetic acid, the electron-donor species was found to be the triplet state of the porphyrin dication rather than that of the free-base porphyrin itself. In addition, reaction of the porphyrin dication triplet state with the protonated quinone species QH+, rather than Q, was found to be responsible for the observed electron transfer and the resulting CIDNP signals.

AB - The mechanism of proton-assisted photoinduced electron transfer from porphyrins to quinones has been investigated by a combination of NMR, photo-CIDNP, laser flash photolysis, and UV-vis absorption techniques. In aromatic solvents containing trifluoroacetic acid, the electron-donor species was found to be the triplet state of the porphyrin dication rather than that of the free-base porphyrin itself. In addition, reaction of the porphyrin dication triplet state with the protonated quinone species QH+, rather than Q, was found to be responsible for the observed electron transfer and the resulting CIDNP signals.

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Proton-assisted photoinduced electron transfer from porphyrin to quinone: A photo-CIDNP and laser flash photolysis study

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