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

Photochemical Smog Formation (NO₂ Photolysis) Photochromism of Spiropyran Chlorophyll Fluorescence Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Cis-Trans Isomerization of Retinal Photosynthesis Ozone Formation by UV Light Dye-Sensitized Solar Cell (Grätzel Cell)

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)).