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How to identify redox states using FTIR difference spectroscopy

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tezzapot:
I've been assigned coursework on identifying redox states in proteins using FTIR difference spectroscopy. I've found a paper with an example of the binuclear centre in cytochrome c oxidase bound to CN but they don't explain how they assigned which peaks to the reduced and oxidised forms.

chenbeier:
Cu+ reduced, Cu2+ oxidised

Babcock_Hall:
What chemical species might affect the distribution of the forms of the oxidase?

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