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Sulfates and sulfur salts

Arsenic triselenide

Also known as Diarsenic triselenide, Arsenic selenide (As2Se3), Arsenous selenide

CAS 1303-36-2Formula As2Se3Molar mass 386.72 g/molEC 215-119-5
GHS signal word: Danger. Pictograms: Acute toxicity (severe), Serious health hazard, Hazardous to the environment 1 supplier listed
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Arsenic triselenide chemical structure, As2Se3, CAS 1303-36-2
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
1303-36-2
Formula
As2Se3
Molar mass
386.72 g/mol
EC number
215-119-5
HS code
285390
Category
Sulfates and sulfur salts

What is Arsenic triselenide?

Plain description, key identifiers and synonyms

Arsenic triselenide is a chemical substance with the molecular formula As2Se3 and a molar mass of 386.72 g/mol. Its CAS registry number is 1303-36-2.

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
1303-36-2 CAS number cross-checked
EC number
215-119-5
Molecular formula
As2Se3
UNII
XWS0W0GB8G
MDL number
MFCD00014166
InChIKey
WBFMCDAQUDITAS-UHFFFAOYSA-N
InChI
InChI=1S/As2Se3/c3-1-5-2-4
SMILES (canonical and isomeric)
[As](=[Se])[Se][As]=[Se]

Synonyms

  • Diarsenic triselenide
  • Arsenic selenide (As2Se3)
  • Arsenous selenide
  • Arsenic sesquiselenide
  • As2Se3
  • arsenious selenide
  • Diarsenic triselenide (AsSe3)
  • ((selanylidenearsanyl)selanyl)arsaneselone
  • [(selanylidenearsanyl)selanyl]arsaneselone
  • Arsenic(II) selenide
  • Diselenoxodiarsaselenane
  • Arsenic (III) selenide
  • Diarsaselenane-1,3-diselone

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

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

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
386.72 g/molcalc.
Exact mass
389.5928 Dacalc.
LogP (octanol/water)
-1.9calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
2calc.
Heavy atoms
5calc.
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
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.
  • H330Fatal if inhaled.
  • 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 (18)
  • 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.
  • P284In case of inadequate ventilation wear respiratory protection.
  • P301 + P316If swallowed: Get emergency medical help immediately.
  • P304 + P340If inhaled: Remove person to fresh air and keep comfortable for breathing.
  • P316Get emergency medical help immediately.
  • P319Get medical help if you feel unwell.
  • P320Specific treatment is urgent (see supplemental first aid instructions on the label).
  • P321Specific treatment (see supplemental first aid instructions on the label).
  • P330Rinse mouth.
  • 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.

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

Arsenic triselenide suppliers

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Where suppliers are based

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Arsenic triselenide 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

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

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 Arsenic triselenide is traded under.

HS 2853.90Indicative HS code

Phosphides, whether or not chemically defined, excluding ferrophosphorus, other, other

World exports in 2024
$2.45B
−33.6% vs 2023, imports $816M
2019 to 2024
Top exporters
  1. China68.4%
  2. Israel8.1%
  3. United States4.9%
Top importers
  1. United States19.3%
  2. Japan17.9%
  3. China13.4%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Arsenic triselenide is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Arsenic triselenide, based on the data on this page

What is Arsenic triselenide?

Arsenic triselenide is a chemical substance with the molecular formula As2Se3 and a molar mass of 386.72 g/mol. Its CAS registry number is 1303-36-2.

What is the CAS number of Arsenic triselenide?

The CAS registry number of Arsenic triselenide is 1303-36-2.

What is the molecular formula and weight of Arsenic triselenide?

The molecular formula of Arsenic triselenide is As2Se3 and its molar mass is 386.72 g/mol.

Is Arsenic triselenide hazardous?

Arsenic triselenide carries the GHS signal word "Danger". Main hazards: toxic if swallowed, fatal if inhaled, toxic if inhaled. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Arsenic triselenide?

Arsenic triselenide is usually classified under HS code 285390 (Phosphides, whether or not chemically defined, excluding ferrophosphorus, other…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Arsenic triselenide?

CompoundList lists 1 supplier of Arsenic triselenide 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 Arsenic triselenide?

Suppliers quote Arsenic triselenide 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 Arsenic triselenide

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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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