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Ultrafast transient lens spectroscopy of various C40 carotenoids: lycopene, beta-carotene, (3R,3'R)-zeaxanthin, (3R,3'R,6'R)-lutein, echinenone, canthaxanthin, and astaxanthin.
Phys Chem Chem Phys. 2005 Jul 21; 7(14):2793-803.PC

Abstract

The ultrafast internal conversion (IC) dynamics of seven C(40) carotenoids have been investigated at room temperature in a variety of solvents using two-color transient lens (TL) pump-probe spectroscopy. We provide comprehensive data sets for the carbonyl carotenoids canthaxanthin, astaxanthin, and-for the first time-echinenone, as well as new data for lycopene, beta-carotene, (3R,3'R)-zeaxanthin and (3R,3'R,6'R)-lutein in solvents which have not yet been investigated in the literature. Measurements were carried out to determine, how the IC processes are influenced by the conjugation length of the carotenoids, additional substituents and the polarity of the solvent. TL signals were recorded at 800 nm following excitation into the high energy edge of the carotenoid S2 band at 400 nm. For the S2 lifetime solvent-independent upper limits on the order of 100-200 fs are estimated for all carotenoids studied. The S1 lifetimes are in the picosecond range and increase systematically with decreasing conjugation length. For instance, in the sequence canthaxanthin/echinenone/beta-carotene (13/12/11 double bonds) one finds tau1 approximately 5, 7.7 and 9 ps for the S1-->S0 IC process, respectively. Hydroxyl groups not attached to the conjugated system have no apparent influence on tau1, as observed for canthaxanthin/astaxanthin (tau1 approximately 5 ps in both cases). For all carotenoids studied, tau1 is found to be insensitive to the solvent polarity. This is particularly interesting in the case of echinenone, canthaxanthin and astaxanthin, because earlier measurements for other carbonyl carotenoids like, e.g., peridinin partly showed dramatic differences. The likely presence of an intramolecular charge transfer state in the excited state manifold of C40 carbonyl carotenoids, which is stabilized in polar solvents, has obviously no influence on the measured tau1.

Authors+Show Affiliations

Institut für Physikalische Chemie, Universität Göttingen, Tammannstrasse 6, D-37077 Göttingen, Germany.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16189595

Citation

Kopczynski, Matthäus, et al. "Ultrafast Transient Lens Spectroscopy of Various C40 Carotenoids: Lycopene, Beta-carotene, (3R,3'R)-zeaxanthin, (3R,3'R,6'R)-lutein, Echinenone, Canthaxanthin, and Astaxanthin." Physical Chemistry Chemical Physics : PCCP, vol. 7, no. 14, 2005, pp. 2793-803.
Kopczynski M, Lenzer T, Oum K, et al. Ultrafast transient lens spectroscopy of various C40 carotenoids: lycopene, beta-carotene, (3R,3'R)-zeaxanthin, (3R,3'R,6'R)-lutein, echinenone, canthaxanthin, and astaxanthin. Phys Chem Chem Phys. 2005;7(14):2793-803.
Kopczynski, M., Lenzer, T., Oum, K., Seehusen, J., Seidel, M. T., & Ushakov, V. G. (2005). Ultrafast transient lens spectroscopy of various C40 carotenoids: lycopene, beta-carotene, (3R,3'R)-zeaxanthin, (3R,3'R,6'R)-lutein, echinenone, canthaxanthin, and astaxanthin. Physical Chemistry Chemical Physics : PCCP, 7(14), 2793-803.
Kopczynski M, et al. Ultrafast Transient Lens Spectroscopy of Various C40 Carotenoids: Lycopene, Beta-carotene, (3R,3'R)-zeaxanthin, (3R,3'R,6'R)-lutein, Echinenone, Canthaxanthin, and Astaxanthin. Phys Chem Chem Phys. 2005 Jul 21;7(14):2793-803. PubMed PMID: 16189595.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Ultrafast transient lens spectroscopy of various C40 carotenoids: lycopene, beta-carotene, (3R,3'R)-zeaxanthin, (3R,3'R,6'R)-lutein, echinenone, canthaxanthin, and astaxanthin. AU - Kopczynski,Matthäus, AU - Lenzer,Thomas, AU - Oum,Kawon, AU - Seehusen,Jaane, AU - Seidel,Marco T, AU - Ushakov,Vladimir G, Y1 - 2005/06/21/ PY - 2005/9/29/pubmed PY - 2005/12/16/medline PY - 2005/9/29/entrez SP - 2793 EP - 803 JF - Physical chemistry chemical physics : PCCP JO - Phys Chem Chem Phys VL - 7 IS - 14 N2 - The ultrafast internal conversion (IC) dynamics of seven C(40) carotenoids have been investigated at room temperature in a variety of solvents using two-color transient lens (TL) pump-probe spectroscopy. We provide comprehensive data sets for the carbonyl carotenoids canthaxanthin, astaxanthin, and-for the first time-echinenone, as well as new data for lycopene, beta-carotene, (3R,3'R)-zeaxanthin and (3R,3'R,6'R)-lutein in solvents which have not yet been investigated in the literature. Measurements were carried out to determine, how the IC processes are influenced by the conjugation length of the carotenoids, additional substituents and the polarity of the solvent. TL signals were recorded at 800 nm following excitation into the high energy edge of the carotenoid S2 band at 400 nm. For the S2 lifetime solvent-independent upper limits on the order of 100-200 fs are estimated for all carotenoids studied. The S1 lifetimes are in the picosecond range and increase systematically with decreasing conjugation length. For instance, in the sequence canthaxanthin/echinenone/beta-carotene (13/12/11 double bonds) one finds tau1 approximately 5, 7.7 and 9 ps for the S1-->S0 IC process, respectively. Hydroxyl groups not attached to the conjugated system have no apparent influence on tau1, as observed for canthaxanthin/astaxanthin (tau1 approximately 5 ps in both cases). For all carotenoids studied, tau1 is found to be insensitive to the solvent polarity. This is particularly interesting in the case of echinenone, canthaxanthin and astaxanthin, because earlier measurements for other carbonyl carotenoids like, e.g., peridinin partly showed dramatic differences. The likely presence of an intramolecular charge transfer state in the excited state manifold of C40 carbonyl carotenoids, which is stabilized in polar solvents, has obviously no influence on the measured tau1. SN - 1463-9076 UR - https://www.unboundmedicine.com/medline/citation/16189595/Ultrafast_transient_lens_spectroscopy_of_various_C40_carotenoids:_lycopene_beta_carotene__3R3'R__zeaxanthin__3R3'R6'R__lutein_echinenone_canthaxanthin_and_astaxanthin_ L2 - https://doi.org/10.1039/b506574g DB - PRIME DP - Unbound Medicine ER -