Radical pair dynamics and interactions in quinone-reconstituted photosynthetic reaction centers of Rb. sphaeroides R26: a multifrequency magnetic resonance study

Article Abstract:

Multifrequency time-resolved EPR, quinone replacement and polarized light excitation were combined to investigate the radical pair dynamics and interactions in quinone-reconstituted photosynthetic reaction centers of Rhodobacter sphaeroides R26. The shape of the electron spin-polarized P+*Q(sub A)-* EPR spectrum was found to be strongly dependent on the lifetime and magnetic properties of its precursor radical pair P+*phi(sub A)-*. The magnetic interactions and dynamics of the intermediate P+*phi(sub A)-* radical pair were also revealed from spectral simulations.

Bacteria, Photosynthetic, Photosynthetic bacteria

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EPR study of the semiquinone biradical Q(sub A)(super .-)Q(Sub B)(super .-) in photosynthetic reaction centers of rhodobacter sphaeroides at 326 GHz: determination of the exchange interaction J(sub 0)

Article Abstract:

The trapping and characterization of the semiquinon biradical Q(sub A)(super .-)Q(Sub B)(super .-), which forms an intermediate state in the photocycle of the bacterial photosynthetic reaction center from Rhodobacter sphaseroides is described. EPR study of this biradical at 9.6, 35 and 94 GHz allows to determine an accurate value of the dipole-dipole interaction and to estimate the exchange interaction J(sub o) between the radicals.

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Exchange interaction in covalently bonded biradical-monoradical composite molecules

Article Abstract:

The nitronyl nitroxide triradical, in which a ground-state triplet biradical and a monoradical are covalently united, is synthesized. An X-ray crystal structure analysis showed that the triradical molecules are arranged in a one-dimensional molecular chain in the crystal.

Chemical bonds, Chemical properties, Nitro compounds

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