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EPR at 24 T of the primary donor radical cation from Blastochloris viridis by Peter J. Bratt; Peter Heathcote; Alia Hassan; Johann van Tol; Louis-Claude Brunel; Joshua Schrier; Alexander Angerhofer is a Physics and Astronomy article available to read on EtoBox.

What is EPR at 24 T of the primary donor radical cation from Blastochloris viridis about?

The g-matrix of photosynthetic pigments has been studied in the last decade due to the advent of high-field EPR techniques. It can be observed when the spectral splitting of the principal g-factor components is larger than the linewidth due to unresolved hyperfine splitting and if there is no g-strain obscuring it. For large organic molecules such as the primary electron donor in photosynthetic reaction centers (RC) this usually requires fields above 11 T, or, for fields between 3 and 11 T, full deuteration and/or single crystal work. Here we present for the first time the fully resolved rhombic EPR spectrum of the primary donor of Blastochloris viridis (formerly called Rhodopseudomonas viridis), a purple photosynthetic bacterium containing bacteriochlorophyll b. As was the case for Rhodobacter sphaeroides, g-strain is negligible for this radical up to a field of 24 T. The temperature dependence of the g-anisotropy is presented and compared with that of the bacteriochlorophyll a-containing Rb. sphaeroides and plant photosystem I. A slight shift in the principal components of the gmatrix is observed at temperatures below 70 K, where it becomes more axial. The experimental work is co

Who reads EPR at 24 T of the primary donor radical cation from Blastochloris viridis?

Author

Peter J. Bratt; Peter Heathcote; Alia Hassan; Johann van Tol; Louis-Claude Brunel; Joshua Schrier; Alexander Angerhofer

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0301-0104)

Published

2003

Language

EN

Field

Physics and Astronomy (Physical Sciences)