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Is the iron at the reaction centre in the $3^+$ or $2^+$ oxidation state?

For instance, 1AIG is $2^+$ or, perhaps it will depend upon charge separation state? I checked the PDB: some are $3^+$ while some are $2^+$.

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    $\begingroup$ At what reaction centre? $\endgroup$ – canadianer Mar 28 '17 at 3:00
  • $\begingroup$ The question needs more information. The pH is critical to the answer. $\endgroup$ – James Mar 28 '17 at 3:58
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    $\begingroup$ Iron in these complexes is used to transfer electrons and so can exist in both oxidation states. $\endgroup$ – canadianer Mar 28 '17 at 4:15
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    $\begingroup$ How will PH influence the oxidize state? Just the normal living plants and bacteria. I saw in PDB various molecules. They marked out whether they are 3+ or 2+ ......I think they did not specify the PH? $\endgroup$ – latra Mar 28 '17 at 7:27
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    $\begingroup$ @latra yes, Fe in cytochromes is also fixed, but it also functions to transport electrons. Like cytochrome c oxidase, or generally, all cytochromes in electron transport chain in respiration. $\endgroup$ – another 'Homo sapien' Mar 28 '17 at 11:54

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