What does dichloride mean?
A dichloride is a chemical compound in which two chlorine atoms are bonded to a single element or functional group, most typically represented by binary compounds of the general formula ECl₂. Familiar examples include tin dichloride (SnCl₂), a widely used reducing agent, and ethylene dichloride, an industrial intermediate historically important in producing vinyl chloride for plastics. The term belongs primarily to the vocabulary of chemists, engineers, and pharmacists, and appears frequently in technical literature and product specifications. In contemporary systematic nomenclature, many such substances are instead named with the prefix 'dichloro-', so words like dichloromethane have largely displaced older forms such as methylene dichloride. Understanding the word helps readers interpret ingredient lists, safety data sheets, and scientific writing where precise identification of chlorine-containing compounds matters.
nounA chemical compound containing two chlorine atoms bonded to another element or group, especially a binary compound of the form ECl₂. Dichlorides are common in inorganic and industrial chemistry.
- A binary chemical compound containing two atoms of chlorine combined with one atom or group of another element, as in carbon dichloride (CCl₄) or tin dichloride (SnCl₂).
- Any compound containing a divalent –Cl₂ group attached to an organic moiety, such as ethylene dichloride (1,2-dichloroethane).
"The chemist prepared a solution of tin dichloride for the reduction reaction."
"Tin dichloride serves as a mild reducing agent in organic synthesis."
"Ethylene dichloride was once produced on a massive scale as an intermediate in vinyl chloride manufacture."
Regular plural formation; used when referring collectively to multiple such compounds.
"Several metal dichlorides exhibit interesting catalytic properties."
Methylene dichloride — better known as dichloromethane — is so good at dissolving things that it's been used to decaffeinate coffee without touching the beans' flavour compounds.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of dichloride
The word dichloride combines the Greek-derived prefix 'di-', meaning 'two', with 'chloride', itself formed from 'chlorine'. Chlorine was named in the early nineteenth century from the Greek 'chlōros', meaning pale green or yellow-green, a reference to the colour of the gas; the English scientist Humphry Davy proposed the name around 1810. The suffix '-ide' is the standard chemical ending denoting a binary compound. Thus dichloride literally signals a compound with two chlorine components, following the same pattern as related terms like monoxide and dioxide.
How dichloride is actually used
Dichloride is a technical term used chiefly in chemistry, industry, and pharmacology. In modern IUPAC-style nomenclature, many dichlorides are more commonly named with prefixes such as 'dichloro-' (e.g. dichloromethane rather than methylene dichloride), so the '-dichloride' form often appears in older or trade names.
Easily confused with dichloride
A chloride is a compound containing one chlorine atom, while a dichloride contains two chlorine atoms per unit.