Energy transfer and spin polarization of the carotenoid triplet state in synthetic carotenoporphyrin dyads and in natural antenna complexes

D. Carbonera, M. Di Valentin, G. Agostini, G. Giacometti, P. A. Liddell, John Devens Gust, Ana L Moore, Thomas A Moore

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

A series of carotenoporphyrin dyads, in which the carotenoid is covalently linked to a tetraarylporphyrin at the ortho, meta or para position of one of the meso aromatic rings, has been studied using Time-Resolved Electron Paramagnetic Resonance (TREPR) spectroscopy. In parallel, an investigation has been carried, on two different photosynthetic antenna systems, the B800-B850 complex of R. acidophila and the LHCII complex of higher organisms. The initial spin polarization of the carotenoid triplet-state, populated indirectly by laser excitation, has been detected. It has been demonstrated that the initial polarization is not a characteristic property of the carotenoid triplet-state, as previously stated, but depends on the donor-acceptor mutual orientation. The triplet energy transfer to the carotenoid from a chlorophyll or porphyrin triplet state is discussed on the basis of the observed spin polarization.

Original languageEnglish
Pages (from-to)487-504
Number of pages18
JournalApplied Magnetic Resonance
Volume13
Issue number3-4
Publication statusPublished - 1997

Fingerprint

carotenoids
Spin polarization
Carotenoids
Energy transfer
atomic energy levels
antennas
energy transfer
Antennas
polarization
Laser excitation
Porphyrins
chlorophylls
Chlorophyll
organisms
porphyrins
Paramagnetic resonance
electron paramagnetic resonance
Spectroscopy
Polarization
rings

ASJC Scopus subject areas

  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Energy transfer and spin polarization of the carotenoid triplet state in synthetic carotenoporphyrin dyads and in natural antenna complexes. / Carbonera, D.; Di Valentin, M.; Agostini, G.; Giacometti, G.; Liddell, P. A.; Gust, John Devens; Moore, Ana L; Moore, Thomas A.

In: Applied Magnetic Resonance, Vol. 13, No. 3-4, 1997, p. 487-504.

Research output: Contribution to journalArticle

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AU - Agostini, G.

AU - Giacometti, G.

AU - Liddell, P. A.

AU - Gust, John Devens

AU - Moore, Ana L

AU - Moore, Thomas A

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