Photodissociation of Chlorine Gas

Cl2 → 2Cl·

Tổng quan

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.

Ví dụ thực tế

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

Tầm quan trọng công nghiệp

Free radical chlorination is used to manufacture chlorinated solvents, PVC (polyvinyl chloride), and various chlorinated organic compounds.

Tính chất

Loại
Photochemical
Thuận nghịch
Không
Năng lượng
Thu nhiệt
ΔH
242,6 kJ/mol

Phản ứng liên quan

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.