Photochromism of Spiropyran

Spiropyran (colorless) → Merocyanine (colored)

Ikhtisar

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.

Contoh Sehari-hari

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

Pentingnya dalam Industri

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

Sifat

Jenis: Photochemical
Dapat Dibalik: Ya
Energi: Endoterm

Reaksi Terkait

Photochemical Smog Formation (NO₂ Photolysis) 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 Silver Chloride Photodecomposition Dye-Sensitized Solar Cell (Grätzel Cell)

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).