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- W1979985369 abstract "We show that X-ray magnetic circular dichroism (XMCD) can be employed to probe the oxidation states and other electronic structural features of nickel active sites in proteins. As a calibration standard, we have measured XMCD and X-ray absorption (XAS) spectra for the nickel(II) derivative of Pseudomonas aeruginosa azurin (NiAz). Our analysis of these spectra confirms that the electronic ground state of NiAz is high-spin (S = 1); we also find that the L3-centroid energy is 853.1(1) eV, the branching ratio is 0.722(4), and the magnetic moment is 1.9(4) μB. Density functional theory (DFT) calculations on model NiAz structures establish that orbitals 3dx2-y2 and 3dz2 are the two valence holes in the high-spin Ni(II) ground state, and in accord with the experimentally determined orbital magnetic moment, the DFT results also demonstrate that both holes are highly delocalized, with 3dx2-y2 having much greater ligand character." @default.
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- W1979985369 date "2004-04-20" @default.
- W1979985369 modified "2023-10-18" @default.
- W1979985369 title "X-ray Magnetic Circular Dichroism of <i>Pseudomonas </i><i>aeruginosa</i> Nickel(II) Azurin" @default.
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- W1979985369 doi "https://doi.org/10.1021/ja036218d" @default.
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