What oxidation state is iron in hemoglobin?
1 Answer
Heme in hemoglobin starts out like this:
A histidine can bind at the fifth coordination site, while
When
"O"_2 + e^(-) -> "O"_2^(-),O2+e−→O−2,
and the oxidation half-reaction is
"Fe"^(2+) -> "Fe"^(3+) + e^(-),Fe2+→Fe3++e−,
giving the overall reaction as:
"O"_2 + cancel(e^(-)) -> "O"_2^(-)
"Fe"^(2+) -> "Fe"^(3+) + cancel(e^(-))
"-----------------------------------------"
color(blue)("O"_2 + "Fe"^(2+) -> "Fe"^(3+) + "O"_2^(-))
On the other hand,