EPR

Electron magnetic resonance spectroscopy of organic radicals in liquid phase




Research

Redox reactions of quinone compounds have found application in many areas of chemistry and biology, such as photosynthesis, anthracycline cytostatic drugs, and wood and paper chemistry. In this research electron spin resonance (ESR; EPR) and electron nuclear double resonance (ENDOR) spectroscopic methods are used to determine magnetic parameters for quinone radicals in the liquid phase. For example, the isotropic hyperfine coupling constants can act as sensitive probes in the determination of molecular geometries, dynamics, and radical - solvent interactions. When experiments are combined with modern spectral analysis tools and high-level ab initio calculations, it is possible to characterize the radicals in great detail.

Representative publications

J. Eloranta, R. Suontamo, and M. Vuolle, Molecular orbital study of the isotropic hyperfine coupling constants of hydroquinone and tetramethylhydroquinone cation radicals, Journal of the Chemical Society, Faraday Transactions 93, 3313 (1997).

J. Eloranta, Xemr - A general purpose Electron Magnetic Resonance software, EPR Newsletter (International EPR society) 10, 3 (1999).

J. Eloranta and M. Vuolle, Temperature dependence of the isotropic hyperfine coupling constants in 1,4-hydroquinone and 1,4-dihydroxy-naphthalene cation radicals, Magnetic Resonance in Chemistry 36, 98 (1998).

S. Fiedler and J. Eloranta, Effects of static and dynamics perturbations on isotropic hyperfine coupling constants in quinone radicals, Magnetic Resonance in Chemistry 43, 231 (2005).


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