Methylene - CH<sub>2</sub>

What is Methylene?

Methylene is a diatomic radicle forming ethers analogous to those of ethylene. The chemical formula of methylene is CH2. Methylene is a fluid like chloroform in appearance and odor, but differing in its boiling point and its specific gravity. Methylene was used as the name for methanol, which is wood alcohol, CH3OH, in the early 19th century. Methylene comes from methe + hyde the latter being the Greek word for wood, so methylene would mean wine from wood.

Other names – Dihydridocarbon, Carbene, Methylene, Methylene radical

CH2

Methylene

Density

0.98 g/mL at 25 °C

Molecular Weight/ Molar Mass

14.0266 g mol−1

Boiling Point

39.75 oC at 760 mm Hg

Chemical Formula

CH2

Methylene Structure – CH2


Methylene Structure

Physical Properties of Methylene – CH2

Odour

No odour

Appearance

Colourless gas

Covalently-Bonded Unit

1

Molar entropy

193.93 J K−1 mol−1

Heavy Atom Count

1

Solubility

Soluble in water

Chemical Properties of Methylene – CH2

  • Methylene reacts with atmospheric hydrogen forms saturated hydrocarbon methane. The chemical equation is given below.
  • CH2 + H2 → CH4

  • Methylene readily undergoes oxidation resulting in the formation of water and carbon monoxide. The chemical equation is given below.
  • CH2 + O2 → H2O + CO

Uses of Methylene – CH2

  • Methylene as methylene chloride is the active ingredient in many paint removers, including commercial and furniture strippers and home paint removers.
  • Methylene as methylene blue is used for a number of therapeutic and diagnostic procedures in human and veterinary medicine.
  • Methylene has been used as electroactive probe to cyclic voltammetric detection of chemical DNA.
  • Also used in the treatment of drug-induced and some forms of genetic methemoglobinemia.

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