Photochromism of Spiropyran

Spiropyran (colorless) → Merocyanine (colored)

概要

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.

日常の例

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

産業上の重要性

フォトクロミック材料は調光レンズ、スマートウインドウ、光データ記憶、ナノテクノロジー用分子スイッチに使用される。

特性

タイプ
Photochemical
可逆的
はい
エネルギー
吸熱性

関連する反応

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).