Published February 1972
| public
Journal Article
A Magnetic Susceptibility Study of Hemerythrin Using an Ultrasensitive Magnetometer
Abstract
The magnetic susceptibilities of oxy- and metaquohemerythrin in the range 3-200°K have been determined using an ultrasensitive superconducting quantum magnetometer, and for the first time their antiferromagnetic components have been conclusively resolved. The exchange coupling constants, J, between the two high-spin iron(III) atoms in each subunit are -77 and -134 cm^(-1), respectively. The electronic spectra of these two proteins in deuterium oxide have been measured from 800 to 1200 nm but no additional bands were obtained. After comparison to magnetic and spectroscopic data obtained previously for ferric dimer model complexes, it is concluded that the two iron(III) atoms in subunits of both oxy- and metaquohemerythrin are oxo bridged.
Additional Information
© 1972 American Chemical Society. Contribution No. 4322 from the Arthur Amos Noyes Laboratory of Chemical Physics (J. W. D., H. B. G., G. R. R., and J. M. S.) and from the Alfred P. Sloan Laboratory of Mathematics and Physics (H. E. H. and R.-H. W,), California Institute of Technology, Pasadena, California 91109. Received September 2, 1971. This investigation was supported by the National Science Foundation, the Office of Naval Research, IBM Corp., and the Deutsche Forschungsgemeinschaft. We thank Dr. S. Simon and B. Grube (Rockefeller University) for help with the initial stages of this work, and R. F. Haack (Jet Propulsion Laboratory, California Institute of Technology) for the atomic absorption analyses of iron.Additional details
- Eprint ID
- 44006
- DOI
- 10.1021/bi00753a026
- Resolver ID
- CaltechAUTHORS:20140226-092216634
- NSF
- Office of Naval Research (ONR)
- IBM Corp.
- Deutsche Forschungsgemeinschaft (DFG)
- Created
-
2014-02-26Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field
- Caltech groups
- Division of Geological and Planetary Sciences
- Other Numbering System Name
- Caltech Arthur Amos Noyes Laboratory of Chemical Physics
- Other Numbering System Identifier
- 4322