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

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The local structure of heme-iron of hydroxide complex of ferric myoglobin duringthe thermal spin equilibrium between high and low spin states has been studied by ahigh-resolution XANES. The spin-state sensitive near-edge features have been foundin the pre-edge Is-3d transition peak and absorption threshold region. The magnitudeof these characteristic features are dependent on the ratio of h igh spin to low spin con-centration, which is interpreted in terms of the d-electron configuration and localstructure of heme-iron, i.e. the distortion of octahedral ligand field caused by adisplacement of heme-iron from the hemeplane and deform;ttion of porphyrin ring.These spin-state sensitive near-edge structures were also found for other myoglobinderivatives. The general relation between these near-edge features and spin state sug-gests that they can be used as a spin-state marker.
社団法人日本物理学会の論文
1987-09-15