Luminol Chemiluminescence

C8H7N3O2 + H2O2 → 3-aminophthalate + N2 + hν (blue light)

Обзор

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.

Участники

Роль Вещество Коэффициент Состояние
Реагент Hydrogen Peroxide H₂O₂ 1 (aq)

Пример из жизни

Crime scene investigators spray luminol solutions in dark rooms to detect invisible bloodstains that glow blue.

Промышленное значение

Luminol is used in forensic science, analytical chemistry, environmental monitoring, and biological research for detecting trace metals and reactive oxygen species.

Свойства

Тип
Photochemical
Обратимая
Нет
Энергия
Экзотермическая
ΔH
-300,0 kJ/mol
Катализатор
Fe²⁺ (from hemoglobin)

Связанные реакции

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)).