proteins is not probable unless the protein were attached to a pyrrole ring rather than being coordinated to iron(III).Acknowledgments. This investigation was supported in part by a grant from the Research Corporation. We are grateful to Barney Nist, University of Washington, for measuring the temperature-dependent nmr spectra and Professor G. Gerhold for supplying the computer program. We also thank Professor W. S. Caughey for helpful discussions.Characterization of a d7 Iron System.

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