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• W2032538465 abstract "Spin polarized transient ESR spectra of 3P680 in D1D2cytb559-complexes of Photosystem II are studied as a function of temperature. The spin polarization as well as the rise time of the ESR signals are characteristic of triplet formation via recombination from the primary radical pair P+•680Pheo−•. Below 100K the well-known spectrum of 3P680 is observed with zero-field splitting (zfs) parameters associated with the triplet state of monomeric chlorophyll-a (Chl). Between 100 K and 200 K the spectral pattern changes drastically and above 200 K a considerably narrowed triplet spectrum (i.e. reduced zfs parameters) is observed which suggests a delocalization of the triplet excitation. When the temperature-dependent spectra are normalized to the same triplet yield, isosbestic points are observed indicating that the spectra are weighted sums of the limiting case spectra at low and high temperature (10 K and 250 K, respectively). This is taken as evidence that a transition between two triplet states of different electronic origin occurs. The coefficients of this superposition follow a sigmoidal temperature dependence which suggests a distribution of activation energies for the triplet delocalization process in accordance with a glass-like distribution of protein matrix conformations. The narrowing of the spectrum at high temperature can be interpreted as thermally activated delocalization of the triplet excitation over at least two Chl units with different orientations with respect to the PS II reaction center, viz. one oriented with its plane tilted 30° with respect to the membrane plane and the other with its plane perpendicular. The similarities and differences in the cofactor arrangement of PS II and purple bacteria reaction center are discussed." @default.
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• W2032538465 date "1996-12-01" @default.
• W2032538465 modified "2023-09-27" @default.
• W2032538465 title "Evidence for delocalization of the triplet state 3P680 in the D1D2cytb559-complex of photosystem II" @default.
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• W2032538465 doi "https://doi.org/10.1002/bbpc.19961001221" @default.
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