TY - JOUR
T1 - The dynamics of the S1 excited states of carotenoids
AU - Frank, Harry A.
AU - Farhoosh, Roya
AU - Gebhard, Ronald
AU - Lugtenburg, Johan
AU - Gosztola, David
AU - Wasielewski, Michael R.
N1 - Funding Information:
The authors wish to thank Professor Ronald L. Christensen for numerous helpful discussions related to our work on carotenoids and for critically reading this manuscript. This work was supported by grants to HAF from the National Institutes of Health (GM-30353) and the University of Connecticut Research Foundation, and to JL from the Netherlands Foundation of Chemical Research (SON), which is tinanced by the Netherlands Organization for the Advancement of Pure Research (NWO). The work at Argonne National Laboratory was supported by the Division of Chemical Sciences, Office of Basic Energy Sciences, US DOE, under contract W-31:109-ENG-38.
PY - 1993/5/14
Y1 - 1993/5/14
N2 - Transient absorption spectroscopy was used to measure the S1 dynamics of four all-trans-carotenoids: 3,4,7,8-tetrahydrospheroidene, 3,4,5,6-tetrahydrospheroidene, 3,4-dihydrospheroidene and spheroidene. After excitation into the S2 state and subsequent relaxation to the S1 state, the S1 → Sn electronic absorption bands in the region 460-520 nm were probed and observed to decay with single-exponential kinetics: τ = 407 ± 23 ps for 3,4,7,8-tetrahydrospheroidene, 85 ± 5 ps for 3,4,5,6-tetrahydrospheroidene, 25.4 ± 0.9 ps for 3,4-dihydrospheroidene and 8.7 ± 0.1 ps for spheroidene. These data are discussed in three contexts: (1) as a test of the adherence of carotenoids to the energy gap law; (2) as a means of determining the S1 state energy of spheroidene, which appears to be at 14100 cm-1; and (3) in terms of the constraints placed on the efficiencies of carotenoid-to-chlorophyll energy transfer in photosynthetic systems.
AB - Transient absorption spectroscopy was used to measure the S1 dynamics of four all-trans-carotenoids: 3,4,7,8-tetrahydrospheroidene, 3,4,5,6-tetrahydrospheroidene, 3,4-dihydrospheroidene and spheroidene. After excitation into the S2 state and subsequent relaxation to the S1 state, the S1 → Sn electronic absorption bands in the region 460-520 nm were probed and observed to decay with single-exponential kinetics: τ = 407 ± 23 ps for 3,4,7,8-tetrahydrospheroidene, 85 ± 5 ps for 3,4,5,6-tetrahydrospheroidene, 25.4 ± 0.9 ps for 3,4-dihydrospheroidene and 8.7 ± 0.1 ps for spheroidene. These data are discussed in three contexts: (1) as a test of the adherence of carotenoids to the energy gap law; (2) as a means of determining the S1 state energy of spheroidene, which appears to be at 14100 cm-1; and (3) in terms of the constraints placed on the efficiencies of carotenoid-to-chlorophyll energy transfer in photosynthetic systems.
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U2 - 10.1016/0009-2614(93)85016-H
DO - 10.1016/0009-2614(93)85016-H
M3 - Article
AN - SCOPUS:0002932379
VL - 207
SP - 88
EP - 92
JO - Chemical Physics Letters
JF - Chemical Physics Letters
SN - 0009-2614
IS - 1
ER -