X-ray absorption spectroscopy of the dimeric iron site in azidomethemerythrin from Phascolopsis gouldii.
Open Access
- 1 October 1982
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 79 (20), 6255-6259
- https://doi.org/10.1073/pnas.79.20.6255
Abstract
X-ray absorption spectroscopy was used to study the dimeric Fe center in azidomethemerythrin from P. gouldii. Absorption edge data confirm that the 2 Fe atoms are present as Fe(III) and suggest a hexa-coordination site for each of the Fe atoms. The extended X-ray absorption fine structure (EXAFS) analysis provides direct structural evidence of a .mu.-oxo bridge between the 2 Fe atoms at an average Fe-O distance of 1.71-1.76 .ANG.. Analysis using a multiple-scattering formalism calculates upper limits of 165.degree. for the Fe-O-Fe bridging angle and 3.38 .ANG. for the Fe-Fe distance. This result agrees with current cystallographic models being determined by refinement of structures of 2 azidomethemerythrins.This publication has 12 references indexed in Scilit:
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