Photoisomerization of Azobenzene

trans-Azobenzene → cis-Azobenzene

概述

UV light (340 nm) converts the thermodynamically stable trans isomer of azobenzene to the cis form through rotation around the N=N bond. Visible light (450 nm) or thermal relaxation converts it back. The large geometric change (9 Å to 5.5 Å end-to-end distance) makes azobenzene a versatile molecular switch.

日常示例

Azobenzene-based molecular motors can move objects millions of times their own mass when triggered by light.

工业重要性

偶氮苯光异构化用于光控药物释放、液晶光开关和光驱动分子马达等智能材料和纳米机器领域。

属性

类型
Photochemical
可逆
是
能量
吸热
ΔH
50.0 kJ/mol

相关反应

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 Photoisomerization of Azobenzene?
The balanced equation is: trans-Azobenzene → cis-Azobenzene.
What type of reaction is Photoisomerization of Azobenzene?
Photoisomerization of Azobenzene is a photochemical reaction. It is reversible under certain conditions.
Is Photoisomerization of Azobenzene exothermic or endothermic?
Photoisomerization of Azobenzene is endothermic (absorbs energy). The enthalpy change (ΔH) is 50.0 kJ/mol.