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Electron paramagnetic resonance conformers

Electron paramagnetic resonance spectroscopy (HER), also called electron spin resonance spectroscopy (ESR), may be used for direct detection and conformational and structural characterization of paramagnetic species. Good introductions to F.PR have been provided by Fischer8 and I.effler9 and most books on radical chemistry have a section on EPR. EPR detection limits arc dependent on radical structure and the signal complexity. However, with modern instrumentation, radical concentrations > 1 O 9 M can be detected and concentrations > I0"7 M can be reliably quantified. [Pg.15]

The temperature dependence of the magnetic complex conformation is known to be one of the distinguishable features of Jahn-Teller (JT) dynamics [1]. Keeping in mind electron paramagnetic resonance (EPR) as one of the most effective methods of studying the JT effect, we shall consider the problem of the transition from the low temperature, static JT situation to the high temperature, dynamic, motional averaged JT situation. The results of such processes are discussed in the literature [1-4]. At the same time, some important features - the nature of the transitions... [Pg.483]

Mroczka N, Bernhard WA. (1995) Electron paramagnetic resonance investigation of X-irradiated poly(U), poly(A) and poly(A) poly(U) Influence of hydration, packing and conformation on radical yield at 4 K. Radiat Res 144 251-257. [Pg.539]

Rink T, Pfeiffer M, Oesterhelt D, Gerwert K, Steinhoff HJ. Unraveling photoexcited conformational changes of bacteriorhodopsin by time resolved electron paramagnetic resonance specttoscopy. Biophys. J. 2000 78 1519-1530. [Pg.107]

Conformational Changes and the Inversion of Spin-Polarization Identified by Low-Temperature Electron Paramagnetic Resonance Spectroscopy of the Reaction Center-Bound 15-cis-Spheroidene A Hypothetical Mechanism of Triplet-Energy Dissipation [19]... [Pg.39]

Altenbach C, Eroncisz W, Hyde JS, Hubbell WL (1989) Conformation of spin-labeled melittin at membrane surfaces investigated by pulse saturation recovery and continuous wave power saturation electron-paramagnetic resonance. Biophys J 56 1183-1191... [Pg.117]

Bordignon E, Klare JP, Holterhues J, Martell S, Krasnaberski A, Engelhard M, Steinhoff HJ (2007) Analysis of light-induced conformational changes of Natronomonas pharaonis sensory rhodopsin II by time resolved electron paramagnetic resonance spectroscopy. Photochem Photobiol 83(2) 263-272... [Pg.154]

Morse RH, Chan SI (1980) Electron paramagnetic resonance studies of nitrosyl ferrous heme complexes. Determination of an equilibrium between two conformations. J Biol Chem... [Pg.156]

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