Nanosecond-Flash 15N Photo-CIDNP MAS NMR on Reaction Centers of Rhodobacter sphaeroides R26Report as inadecuate




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Applied Magnetic Resonance

, 37:49

First Online: 11 November 2009Received: 28 April 2009Revised: 09 June 2009

Abstract

Photochemically induced dynamic nuclear polarization photo-CIDNP is observed with time-resolved N magic-angle spinning MAS nuclear magnetic resonance NMR in uniformly N-labeled reaction centers RCs of the purple bacterium Rhodobacter Rb. sphaeroides R26 under illumination with nanosecond laser flashes. The N NMR signals enhanced by the solid-state photo-CIDNP effect are related to electron spin densities in the primary radical pair and allow for reconstruction of the electronic structure at atomic scale. New assignments for the photochemically active nitrogens are proposed based on simulations of the intensities. The ratio of electron spin densities between cofactors PL and PM is observed to be about 4:1. The origin of the high asymmetry is discussed.

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Author: Eugenio Daviso - Shipra Prakash - A. Alia - Peter Gast - Gunnar Jeschke - Jörg Matysik

Source: https://link.springer.com/







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