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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 1999
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2001
User Contributions:
Comment about this article or add new information about this topic:
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.
Publication Name: Journal of Physical Chemistry B
Subject: Chemicals, plastics and rubber industries
ISSN: 1520-6106
Year: 2005
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Excited state dynamics in FMO antenna complexes from photosynthetic green sulfur bacteria: a kinetic model. Electron-vibrational coupling in the Fenna-Matthews-Olson complex of prosthecochloris aestuarii determined by temperature-dependent absorption and fluorescence line-narrowing measurements
- Abstracts: Excited state energy transfer pathways in photosynthetic reaction centers. 4. asymmetric energy transfer in the heterodimer mutant
- Abstracts: Evidence for highly dispersive primary charge separation kinetics and gross heterogeneity in the isolated PS II reaction center of green plants
- Abstracts: Pressure-induced phase transformations in LiAlH4. Comment on "effect of chromium substitution on the lattice vibration of spinel lithium manganate: A new interpretation of the Raman spectrum of LiMn2O4"
- Abstracts: Hydration of tetraphenylphosphonium and tetraphenylborate ions by dielectric relaxation spectroscopy