Temperature dependence of the magnetic susceptibility of cobalt (II) stellacyanin. |
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Authors: | E I Solomon R Wang D R McMillin H B Gray |
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Institution: | Arthur Amos Noyes Laboratory of Chemical Physics California Institute of Technology Pasadena, California 91125 USA |
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Abstract: | Magnetic susceptibility measurements on cobalt(II) stellacyanin () have been performed between 2.2 and 50 K. The effective magnetic moment of Co(II) in the protein is 3.91 ± 0.12 (μB). Nonlinear behavior below 3 K evidences the presence of zero-field splitting attributable to a low-symmetry component of the ligand field. The results are consistent with a structural model based on a distorted tetrahedral Co(II) site involving one or more extremely covalent metal-ligand bonds. |
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