Photodissociation of Chlorine Gas

Cl2 → 2Cl·

概述

UV or visible light (< 500 nm) cleaves the Cl–Cl bond homolytically to produce two chlorine free radicals. This is the initiation step in many radical chain reactions, including the chlorination of hydrocarbons. Each chlorine radical can propagate thousands of reaction cycles before termination.

日常示例

The chlorination of methane to produce chloromethane begins with this UV-initiated splitting of chlorine gas.

工业重要性

氯自由基光化学是平流层臭氧耗损的关键步骤，也是工业光氯化合成（如PVC单体制备）的基础。

属性

类型
Photochemical
可逆
否
能量
吸热
ΔH
242.6 kJ/mol

相关反应

Photochemical Smog Formation (NO₂ Photolysis) Photochromism of Spiropyran Chlorophyll Fluorescence Photodegradation of Methylene Blue by TiO₂ 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 Photodissociation of Chlorine Gas?
The balanced equation is: Cl₂ → 2Cl·.
What type of reaction is Photodissociation of Chlorine Gas?
Photodissociation of Chlorine Gas is a photochemical reaction.
Is Photodissociation of Chlorine Gas exothermic or endothermic?
Photodissociation of Chlorine Gas is endothermic (absorbs energy). The enthalpy change (ΔH) is 242.6 kJ/mol.