Discussion
The νO-O resonance Raman stretching frequency (cm-1) of the coordinated dioxygen in oxy-hemoglobin and oxy-hemocyanin appears, respectively, nearly at
Answer: A
The frequencies are 1136 and 744 cm-1 respectively.
In oxy-hemoglobin, O2 binds end-on to one iron and is best described as Fe(III) with a bound superoxide, O2-, whose O-O stretch lies near 1100 to 1150 cm-1; about 1136 cm-1 is observed.
In oxy-hemocyanin, O2 bridges two copper(II) ions side-on as peroxide, O22-, and the weaker O-O bond stretches near 750 cm-1; about 744 cm-1 is observed in the resonance Raman spectrum.
1550 cm-1 is the stretch of free O2, not a coordinated one, and the reversed pairs swap the superoxo and peroxo assignments.
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