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Characterization of the optically excited state of a bis (μ-oxo)-dicopper(III) species mimicking the hemocyanin and tyrosinase active sites

Stephan Binder2, Marco Salomone-Stagni1, Roxana Haase3, Benjamin Schulz2, Andreas Eich2, Gerald Henkel3, Michael Rübhausen2, Sonja Herres-Pawlis3 and Wolfram Meyer-Klaucke1

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Optical excited molecules play an increasingly important role in research at light sources. Here we compare two approaches to structurally characterize such states, pumped-XAS and an innovative combination of EXAFS spectroscopy and resonant Raman scattering. The later combination allows to study efficiently charge-transfer complexes in their ground and excited state. The design of the experimental setups for pumped-XAS and resonant Raman scattering at different temperatures as well as results obtained are presented. We receive twofold information on the structural and electronic properties of both states elucidating the alterations upon induced charge transfer in the Cu2O2-core of a system mimicking the active site of tyrosinase and hemocyanin.


PACS

87.14.E- Proteins

82.39.Jn Charge (electron, proton) transfer in biological systems

87.64.kd X-ray and EXAFS

87.15.B- Structure of biomolecules

87.15.M- Spectra of biomolecules

Subjects

Medical physics

Biological physics

Chemical physics and physical chemistry

Dates

Issue 1 (2009)



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