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PHOTOINDUCED ELECTRON TRANSFER IN A CAROTENOBUCKMINSTERFULLERENE DYAD
Author(s) -
Imahori Hiroshi,
Cardoso Sergio,
Tatman Dereck,
Lin Su,
Noss Lori,
Seely Gilbert R.,
Sereno Leonides,
Silber Juana Chessa de,
Moore Thomas A.,
Moore Ana L.,
Gust Devens
Publication year - 1995
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1995.tb02401.x
Subject(s) - photochemistry , chemistry , chromophore , singlet oxygen , fullerene , photoinduced electron transfer , singlet state , moiety , carotenoid , canthaxanthin , electron transfer , yield (engineering) , photoinduced charge separation , excited state , oxygen , stereochemistry , astaxanthin , materials science , organic chemistry , atomic physics , artificial photosynthesis , physics , food science , metallurgy , photocatalysis , catalysis
A carotenoid‐fullerene dyad has been synthesized by condensing a carotenoid amine with an acid group attached to C 60 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 + ‐C 60 .‐ . In CS 2 solution Car + ‐C 60 .‐ 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 + ‐C 60 .‐ , 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.