Why Does Hemoglobin Cause Longer Fluorescence in Luminol Reactions?

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The discussion centers on the differences in fluorescence duration of luminol during chemiluminescent reactions with H2O2 in two different solutions: CuSO4 and hemoglobin. The key question raised is why the hemoglobin solution exhibits longer fluorescence compared to the CuSO4 solution. It is suggested that while CuSO4 may act as a more effective catalyst for the oxidation reaction, hemoglobin potentially offers a higher quantum yield, leading to prolonged fluorescence. This indicates a complex interaction between the catalytic properties of CuSO4 and the photophysical characteristics of hemoglobin that affects the overall luminescence duration.
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Today in lab we performed two different chemiluminescent reactions - one involving the oxidation of luminol with H2O2 in a CuSO4 solution and the other the oxidation of luminol with H2O2 in a hemoglobin solution.

My question is, why would there be a difference in the duration of the fluorescence of luminol between CuSO4 and hemoglobin? Why would the hemoglobin solution fluoresce for longer?
 
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I would guess that CuSO4 is a better catalysator for the reaction than is Hemoglobine, but the quantum yield is higher with hemoglobine than with CuSO4.
 

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