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Chlorides and other halides

Selenium oxychloride

Also known as Seleninyl chloride, Seleninyl dichloride, Selenium oxydichloride

CAS 7791-23-3Formula Cl2OSeMolar mass 165.87 g/molEC 232-244-0
GHS signal word: Danger. Pictograms: Corrosive, Acute toxicity (severe), Serious health hazard, Hazardous to the environment 1 supplier listed
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Selenium oxychloride chemical structure, Cl2OSe, CAS 7791-23-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Nearly colorless or yellowish liquid
Melting point
8.5 °C
Boiling point
180 °C
Density
2.44 g/cm³ at 16 °C/4 °C
Solubility
Solubility in water at 20 °C: decomposes
HS code
281219
Category
Chlorides and other halides
UN number
UN 2879
Illustrative photo, 200 litre steel drums of liquid in a chemical plant
Typical packagingIllustrative packaging image, not the actual product

What is Selenium oxychloride?

Plain description, key identifiers and synonyms

Selenium oxychloride appears as a colorless to light-colored liquid. Insoluble in water and denser than water. Contact may severely irritate skin, eyes and mucous membranes. May be toxic by ingestion, inhalation and skin absorption. Used to make other chemicals.

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
7791-23-3 CAS number cross-checked
EC number
232-244-0
Molecular formula
Cl2OSe
UNII
1G57T5401W
MDL number
MFCD00016327
InChIKey
LIRMPIXWGWLNND-UHFFFAOYSA-N
InChI
InChI=1S/Cl2OSe/c1-4(2)3
SMILES (canonical and isomeric)
O=[Se](Cl)Cl

Synonyms

  • Seleninyl chloride
  • Seleninyl dichloride
  • Selenium oxydichloride
  • Selenium dichloride oxide
  • Dichlorooxoselenium
  • Selenyl dichloride
  • selenooyl dichloride
  • Selenyl dichloride (seocl2)
  • Selenium oxychloride (seocl2)
  • UN 2879
  • Selenium chloride oxide (SeCl2O)
  • Selenium chloride oxide
  • Cl2OSe
  • Selenoxychlorid
  • selenous dichloride
  • Selenium oxychloride, 97%
  • Selenium oxychloride [UN2879] [Corrosive]

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Nearly colorless or yellowish liquidexp.
Odour
Pungent odorexp.
Melting point
8.5 °Cexp.
Boiling point
180 °Cexp.
Density
2.44 g/cm³ at 16 °C/4 °Cexp.
Solubility
Solubility in water at 20 °C: decomposesexp.
Vapour pressure
1 mm Hg at 34.8 °Cexp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
165.87 g/molcalc.
Exact mass
165.8491 Dacalc.
LogP (octanol/water)
0.88calc.
Topological polar surface area
17.07 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
1calc.
Rotatable bonds
0calc.
Heavy atoms
4calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS05: Corrosive
Corrosive
GHS06: Acute toxicity (severe)
Acute toxicity (severe)
GHS08: Serious health hazard
Serious health hazard
GHS09: Hazardous to the environment
Hazardous to the environment

Hazard statements

  • H301Toxic if swallowed.
  • H314Causes severe skin burns and eye damage.
  • H331Toxic if inhaled.
  • H373May cause damage to organs through prolonged or repeated exposure.
  • H400Very toxic to aquatic life.
  • H410Very toxic to aquatic life with long lasting effects.
Precautionary statements (21)
  • P260Do not breathe dust, fume, gas, mist, vapours or spray.
  • P261Avoid breathing dust, fume, gas, mist, vapours or spray.
  • P264Wash skin thoroughly after handling.
  • P270Do not eat, drink or smoke when using this product.
  • P271Use only outdoors or in a well-ventilated area.
  • P273Avoid release to the environment.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P301 + P330 + P331If swallowed: Rinse mouth. Do not induce vomiting.
  • P302 + P361 + P354If on skin: Take off immediately all contaminated clothing. Immediately rinse with water for several minutes.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P305 + P354 + P338If in eyes: Immediately rinse with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.
  • P316Get emergency medical help immediately.
  • P319Get medical help if you feel unwell.
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • P363Wash contaminated clothing before reuse.
  • P391Collect spillage.
  • P403 + P233Store in a well-ventilated place. Keep container tightly closed.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.
UN number
UN 2879
Transport hazard class
8
Packing group
I

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Selenium oxychloride suppliers

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Where suppliers are based

1 supplier in 1 country

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Selenium oxychloride price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Chlorinating agent and resin plasticizer used in the chemical industry.

Solvent for sulfur, selenium, tellurium, rubber, bakelite, gums, resins, glue, asphalt and other materials.

How it is made

Prepared by passing chlorine into SeO2 suspended in carbon tetrachloride ... By dehydration of dichloroselenious acid.

Selenium oxyhalides ... are prepared by the addition of a halogen to a dry mixture or a carbon tetrachloride suspension of selenium and selenium dioxide. (Selenium oxyhalides)

The action of halogens or halides on elemental selenium yields various selenium halides, depending on the temperature and stoichiometric ratio. (Selenium halides)

Regulatory status

Inventories, regulations and trade controls that list this substance

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Selenium oxychloride is traded under.

HS 2812.19Indicative HS code

Chlorides and chloride oxides, other

World exports in 2024
$159M
+15.9% vs 2023, imports $156M
2019 to 2024
Top exporters
  1. South Korea32.7%
  2. Japan21.7%
  3. Germany16.4%
Top importers
  1. China27.8%
  2. Singapore21.4%
  3. South Korea19.0%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Selenium oxychloride is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Selenium oxychloride, based on the data on this page

What is Selenium oxychloride?

Selenium oxychloride appears as a colorless to light-colored liquid. Insoluble in water and denser than water. Contact may severely irritate skin, eyes and mucous membranes. May be toxic by ingestion, inhalation and skin absorption. Used to make other chemicals.

What is the CAS number of Selenium oxychloride?

The CAS registry number of Selenium oxychloride is 7791-23-3.

What is the molecular formula and weight of Selenium oxychloride?

The molecular formula of Selenium oxychloride is Cl2OSe and its molar mass is 165.87 g/mol.

What is Selenium oxychloride used for?

Chlorinating agent and resin plasticizer used in the chemical industry. Solvent for sulfur, selenium, tellurium, rubber, bakelite, gums, resins, glue, asphalt and other materials.

Is Selenium oxychloride hazardous?

Selenium oxychloride carries the GHS signal word "Danger". Main hazards: toxic if swallowed, causes severe skin burns and eye damage, toxic if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Selenium oxychloride?

Selenium oxychloride is usually classified under HS code 281219 (Chlorides and chloride oxides, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Selenium oxychloride?

CompoundList lists 1 supplier of Selenium oxychloride in United States. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Selenium oxychloride?

Suppliers quote Selenium oxychloride on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Selenium oxychloride

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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