Luminol Chemiluminescence
C8H7N3O2 + H2O2 → 3-aminophthalate + N2 + hν (blue light)
Visão geral
Luminol reacts with hydrogen peroxide in the presence of a catalyst (typically iron from hemoglobin in blood) to produce 3-aminophthalate in an excited electronic state. As the molecule relaxes, it emits blue light (425 nm). The iron in blood catalyzes this reaction, making it a powerful forensic tool.
Participantes
| Papel | Substância | Coeficiente | Estado |
|---|---|---|---|
| Reagente | Hydrogen Peroxide H₂O₂ | 1 | (aq) |
Exemplo do cotidiano
Crime scene investigators spray luminol solutions in dark rooms to detect invisible bloodstains that glow blue.
Importância industrial
O luminol é utilizado em ciência forense, química analítica, monitorização ambiental e investigação biológica para a detecção de metais vestigiais e espécies reactivas de oxigénio.
Propriedades
- Tipo
- Photochemical
- Reversível
- Não
- Energia
- Exotérmico
- ΔH
- -300,0 kJ/mol
- Catalisador
- Fe²⁺ (from hemoglobin)
Reações relacionadas
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Photosynthesis
Chlorophyll Fluorescence
Frequently Asked Questions
What is the equation for Luminol Chemiluminescence?
The balanced equation is: C₈H₇N₃O₂ + H₂O₂ → 3-aminophthalate + N₂ + hν (blue light).
What type of reaction is Luminol Chemiluminescence?
Luminol Chemiluminescence is a photochemical reaction.
Is Luminol Chemiluminescence exothermic or endothermic?
Luminol Chemiluminescence is exothermic (releases energy). The enthalpy change (ΔH) is -300.0 kJ/mol.
What conditions are needed for Luminol Chemiluminescence?
This reaction requires a catalyst (Fe²⁺ (from hemoglobin)).