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Anisotropic Magnetic Spin Interactions of Transition Metal Complexes and Metalloenzymes from Spectroscopy and Quantum Chemistry

  • Matthias SteinEmail author
Chapter
Part of the Challenges and Advances in Computational Chemistry and Physics book series (COCH, volume 29)

Abstract

Spectroscopic investigations of the interaction of a spin magnetic moment with an external magnetic field reveal insight into the electronic structure, e.g. the composition of the occupied molecular orbitals of the system, the oxidation state of a possible transition metal and its coordination environment. For paramagnetic systems, electron spin resonance (ESR) and related techniques probe the interaction between electron and nuclear spins, provide information about the spatial distribution of the spin density and allow identifying binding partners which are often not resolved structurally, for example hydrogen atoms. In particular, diagonalization of the electron Zeeman and electron-nuclear hyperfine interaction matrices does not only give their principal values but also their magnetic principal axes and allows making statements about the spatial arrangement of coordinating atoms and ligands. The advancement of computational approaches to calculate the parameters of the effective Spin Hamiltonian such as the electronic g-tensors and hyperfine tensors and their comparison with experiment supports the analysis and interpretation of complex magnetic resonance spectra. This is discussed here for g- and hyperfine tensors and zero-field splitting tensors for selected examples including transition metal containing model complexes and metalloenzymes.

Keywords

bioinorganic chemistry spin-orbit coupling EPR hydrogenase g-tensor single crystals 

Notes

Acknowledgements

Support by the Max Planck Society for the Advancement of Science is acknowledged. Part of this work was also financed by the EU COST Action CM1305 ‘ECOSTBio’ and the EU-program ERDF (European Regional Development Fund) of the German Federal State Saxony-Anhalt within the Research Center of Dynamic Systems (CDS).

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Authors and Affiliations

  1. 1.Molecular Simulations and Design GroupMax Planck Institute for Dynamics of Complex Technical SystemsMagdeburgGermany

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