Local Structure of Heme-Iron Studied by High-Resolution XANES; Thermal Spin Equilibrium in Myoglobin

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  • Local Structure of Heme Iron Studied by

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The local structure of heme-iron of hydroxide complex of ferric myoglobin during the thermal spin equilibrium between high and low spin states has been studied by a high-resolution XANES. The spin-state sensitive near-edge features have been found in the pre-edge 1s-3d transition peak and absorption threshold region. The magnitude of these characteristic features are dependent on the ratio of high spin to low spin concentration, which is interpreted in terms of the d-electron configuration and local structure of heme-iron, i.e. the distortion of octahedral ligand field caused by a displacement of heme-iron from the hemeplane and deformation of porphyrin ring. These spin-state sensitive near-edge structures were also found for other myoglobin derivatives. The general relation between these near-edge features and spin state suggests that they can be used as a spin-state marker.

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