Photochromism of Spiropyran

Spiropyran (colorless) → Merocyanine (colored)

Aperçu

UV light causes the C–O bond in spiropyran to break, opening the ring to form the planar, conjugated merocyanine isomer that absorbs visible light and appears colored. Visible light or heat reverses the reaction. This reversible photochromism is the basis for smart materials that change color in response to light.

Exemple du quotidien

Photochromic sunglasses (Transitions lenses) that darken in sunlight use similar photochromic molecules that reversibly change structure.

Importance industrielle

Photochromic materials are used in self-tinting eyeglasses, smart windows, optical data storage, and molecular switches for nanotechnology.

Propriétés

Type: Photochemical
Réversible: Oui
Énergie: Endothermique

Réactions associées

Cis-Trans Isomerization of Retinal Silver Chloride Photodecomposition Luminol Chemiluminescence Firefly Bioluminescence (Luciferin Oxidation) Photolysis of Water (Vacuum UV) Photochemical Smog Formation (NO₂ Photolysis) Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Chlorophyll Fluorescence

Frequently Asked Questions

What is the equation for Photochromism of Spiropyran?

The balanced equation is: Spiropyran (colorless) → Merocyanine (colored).

What type of reaction is Photochromism of Spiropyran?

Photochromism of Spiropyran is a photochemical reaction. It is reversible under certain conditions.

Is Photochromism of Spiropyran exothermic or endothermic?

Photochromism of Spiropyran is endothermic (absorbs energy).