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Density functional theory study of the beta-carotene radical cation
2001 (English)In: Journal of Physical Chemistry A, ISSN 1089-5639, E-ISSN 1520-5215, Vol. 105, no 33, 7933-7937 p.Article in journal (Refereed) Published
Abstract [en]

The hybrid density functional theory method B3LYP is employed to study the beta -carotene radical cation. The radical is characterized by means of its geometry, spin distribution, and isotropic and anisotropic hyperfine coupling constants. It is shown that the spin is delocalized over the whole pi -conjugated system, including the double bonds of the headgroups. This delocalization results in methyl hyperfine coupling constants lower than 9 MHz, in excellent agreement with recent experimental couplings of the carotene radical in Photosystem II and in vitro, but in conflict with previous theoretical calculations. It is also demonstrated that rotation of the headgroups can affect the properties of the radical, in particular the spin delocalization to the ring.

Place, publisher, year, edition, pages
2001. Vol. 105, no 33, 7933-7937 p.
Keyword [en]
photosystem-ii, epr, oxidation, endor
URN: urn:nbn:se:kth:diva-20882ISI: 000170506700020OAI: diva2:339579
QC 20100525Available from: 2010-08-10 Created: 2010-08-10Bibliographically approved

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Himo, Fahmi
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