PHOTOINDUCED ELECTRON TRANSFER IN A CAROTENOBUCKMINSTERFULLERENE DYAD

Hiroshi Imahori; Sergio Cardoso; Dereck Tatman; Su Lin; Lori Noss; Gilbert R. Seely; Leonides Sereno2; Juana Chessa de Silber; Thomas Moore; Ana Moore; Devens Gust

doi:10.1111/j.1751-1097.1995.tb02401.x

PHOTOINDUCED ELECTRON TRANSFER IN A CAROTENOBUCKMINSTERFULLERENE DYAD

Hiroshi Imahori, Sergio Cardoso, Dereck Tatman, Su Lin, Lori Noss, Gilbert R. Seely, Leonides Sereno2, Juana Chessa de Silber, Thomas Moore, Ana Moore, Devens Gust

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Abstract

A carotenoid‐fullerene dyad has been synthesized by condensing a carotenoid amine with an acid group attached to C₆₀ by a cyclopropane‐based linkage. The lowest excited singlet state of the fullerene is strongly quenched by electron transfer from the carotenoid moiety to generate the charge‐separated species Car⁺‐C₆₀^.‐. In CS₂ solution Car⁺‐C₆₀^.‐ has a rise time of 0.8 ps and decays by charge recombination in 534 ps. Light absorbed by either chromophore produces a high yield of Car⁺‐C₆₀^.‐, which implies that internal conversion in the carotenoid is negligible. The lowest triplet level in the dyad is localized on the carotenoid and is populated in low yield from the charge‐separated species. The sensitization of singlet oxygen by the fullerene component is effectively curtailed in the dyad.

Original language	English (US)
Pages (from-to)	1009-1014
Number of pages	6
Journal	Photochemistry and photobiology
Volume	62
Issue number	6
DOIs	https://doi.org/10.1111/j.1751-1097.1995.tb02401.x
State	Published - Dec 1995

ASJC Scopus subject areas

Biochemistry
Physical and Theoretical Chemistry

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10.1111/j.1751-1097.1995.tb02401.x

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@article{0130e55a8fad454ebe680963447716e0,

title = "PHOTOINDUCED ELECTRON TRANSFER IN A CAROTENOBUCKMINSTERFULLERENE DYAD",

abstract = "A carotenoid‐fullerene dyad has been synthesized by condensing a carotenoid amine with an acid group attached to C60 by a cyclopropane‐based linkage. The lowest excited singlet state of the fullerene is strongly quenched by electron transfer from the carotenoid moiety to generate the charge‐separated species Car+‐C60.‐. In CS2 solution Car+‐C60.‐ has a rise time of 0.8 ps and decays by charge recombination in 534 ps. Light absorbed by either chromophore produces a high yield of Car+‐C60.‐, which implies that internal conversion in the carotenoid is negligible. The lowest triplet level in the dyad is localized on the carotenoid and is populated in low yield from the charge‐separated species. The sensitization of singlet oxygen by the fullerene component is effectively curtailed in the dyad.",

author = "Hiroshi Imahori and Sergio Cardoso and Dereck Tatman and Su Lin and Lori Noss and Seely, {Gilbert R.} and Leonides Sereno2 and Silber, {Juana Chessa de} and Thomas Moore and Ana Moore and Devens Gust",

year = "1995",

month = dec,

doi = "10.1111/j.1751-1097.1995.tb02401.x",

language = "English (US)",

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journal = "Photochemistry and photobiology",

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AU - Imahori, Hiroshi

AU - Cardoso, Sergio

AU - Tatman, Dereck

AU - Lin, Su

AU - Noss, Lori

AU - Seely, Gilbert R.

AU - Sereno2, Leonides

AU - Silber, Juana Chessa de

AU - Moore, Thomas

AU - Moore, Ana

AU - Gust, Devens

PY - 1995/12

Y1 - 1995/12

N2 - A carotenoid‐fullerene dyad has been synthesized by condensing a carotenoid amine with an acid group attached to C60 by a cyclopropane‐based linkage. The lowest excited singlet state of the fullerene is strongly quenched by electron transfer from the carotenoid moiety to generate the charge‐separated species Car+‐C60.‐. In CS2 solution Car+‐C60.‐ has a rise time of 0.8 ps and decays by charge recombination in 534 ps. Light absorbed by either chromophore produces a high yield of Car+‐C60.‐, which implies that internal conversion in the carotenoid is negligible. The lowest triplet level in the dyad is localized on the carotenoid and is populated in low yield from the charge‐separated species. The sensitization of singlet oxygen by the fullerene component is effectively curtailed in the dyad.

AB - A carotenoid‐fullerene dyad has been synthesized by condensing a carotenoid amine with an acid group attached to C60 by a cyclopropane‐based linkage. The lowest excited singlet state of the fullerene is strongly quenched by electron transfer from the carotenoid moiety to generate the charge‐separated species Car+‐C60.‐. In CS2 solution Car+‐C60.‐ has a rise time of 0.8 ps and decays by charge recombination in 534 ps. Light absorbed by either chromophore produces a high yield of Car+‐C60.‐, which implies that internal conversion in the carotenoid is negligible. The lowest triplet level in the dyad is localized on the carotenoid and is populated in low yield from the charge‐separated species. The sensitization of singlet oxygen by the fullerene component is effectively curtailed in the dyad.

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ER -

PHOTOINDUCED ELECTRON TRANSFER IN A CAROTENOBUCKMINSTERFULLERENE DYAD

Abstract

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