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Title: Photoinduced charge separation and charge recombination to a triplet state in a carotene-porphyrin-fullerene triad

Abstract

A molecular triad consisting of a diarylporphyrin (P) covalently linked to a carotenoid polyene (C) and a fullerene (C{sub 60}) has been prepared and studied using time-resolved spectroscopic methods. In 2-methyltetrahydrofuran solution, the triad undergoes photoinduced electron transfer to yield C-P{sup .+}-C{sub 60}{sup .-}, which evolves into C{sup .+}-P-C{sub 60}{sup .-} with an overall quantum yield of 0.14. This state decays by charge recombination to yield the carotenoid triplet state with a time constant of 170 ns. Even in a glass at 77 K, C{sup .+}-P-C{sub 60}{sup .-} is formed with a quantum yield of nearly 0.10 and again decays mainly by charge recombination to give {sup 3}C-P-C{sub 60}. The fullerene triplet, formed through normal intersystem crossing, is also observed at 77K. the generation in the triad of a long-lived charge separated state by photoinduced electron transfer, the low-temperature electron transfer behavior, and the formation of a triplet state by charge recombination are phenomena previously observed mostly in photosynthetic reaction centers. 36 refs., 5 figs.

Authors:
; ; ; ; ; ; ;  [1]
  1. Arizona State Univ. Tempe, AZ (United States)
Publication Date:
OSTI Identifier:
466321
Resource Type:
Journal Article
Journal Name:
Journal of the American Chemical Society
Additional Journal Information:
Journal Volume: 119; Journal Issue: 6; Other Information: PBD: 12 Feb 1997
Country of Publication:
United States
Language:
English
Subject:
40 CHEMISTRY; 55 BIOLOGY AND MEDICINE, BASIC STUDIES; 36 MATERIALS SCIENCE; 66 PHYSICS; PROTEINS; ABSORPTION SPECTRA; EMISSION SPECTRA; ELECTRON TRANSFER; PORPHYRINS; FULLERENES

Citation Formats

Liddell, P A, Kuciauskas, D, Sumida, J P, Nash, B, Nguyen, D, Moore, A L, Moore, T A, and Gust, D. Photoinduced charge separation and charge recombination to a triplet state in a carotene-porphyrin-fullerene triad. United States: N. p., 1997. Web. doi:10.1021/ja9631054.
Liddell, P A, Kuciauskas, D, Sumida, J P, Nash, B, Nguyen, D, Moore, A L, Moore, T A, & Gust, D. Photoinduced charge separation and charge recombination to a triplet state in a carotene-porphyrin-fullerene triad. United States. https://doi.org/10.1021/ja9631054
Liddell, P A, Kuciauskas, D, Sumida, J P, Nash, B, Nguyen, D, Moore, A L, Moore, T A, and Gust, D. 1997. "Photoinduced charge separation and charge recombination to a triplet state in a carotene-porphyrin-fullerene triad". United States. https://doi.org/10.1021/ja9631054.
@article{osti_466321,
title = {Photoinduced charge separation and charge recombination to a triplet state in a carotene-porphyrin-fullerene triad},
author = {Liddell, P A and Kuciauskas, D and Sumida, J P and Nash, B and Nguyen, D and Moore, A L and Moore, T A and Gust, D},
abstractNote = {A molecular triad consisting of a diarylporphyrin (P) covalently linked to a carotenoid polyene (C) and a fullerene (C{sub 60}) has been prepared and studied using time-resolved spectroscopic methods. In 2-methyltetrahydrofuran solution, the triad undergoes photoinduced electron transfer to yield C-P{sup .+}-C{sub 60}{sup .-}, which evolves into C{sup .+}-P-C{sub 60}{sup .-} with an overall quantum yield of 0.14. This state decays by charge recombination to yield the carotenoid triplet state with a time constant of 170 ns. Even in a glass at 77 K, C{sup .+}-P-C{sub 60}{sup .-} is formed with a quantum yield of nearly 0.10 and again decays mainly by charge recombination to give {sup 3}C-P-C{sub 60}. The fullerene triplet, formed through normal intersystem crossing, is also observed at 77K. the generation in the triad of a long-lived charge separated state by photoinduced electron transfer, the low-temperature electron transfer behavior, and the formation of a triplet state by charge recombination are phenomena previously observed mostly in photosynthetic reaction centers. 36 refs., 5 figs.},
doi = {10.1021/ja9631054},
url = {https://www.osti.gov/biblio/466321}, journal = {Journal of the American Chemical Society},
number = 6,
volume = 119,
place = {United States},
year = {Wed Feb 12 00:00:00 EST 1997},
month = {Wed Feb 12 00:00:00 EST 1997}
}