ARSENIC (III) SELENIDE

CAS NO.：1303-36-2
Empirical Formula: As2Se3
Molecular Weight: 386.72
MDL number: MFCD00014166
EINECS: 215-119-5
SAFETY DATA SHEET (SDS)
Update Date: 2026-05-27 23:34:20

What is ARSENIC (III) SELENIDE?

Chemical properties

black crystal(s); dark brown solid; preparation: from melted As and Se; uses: vacuum deposition [CER91] [STR93] [MER06]

The Uses of ARSENIC (III) SELENIDE

Arsenicselenide is used as a chalcogenide glass for infrared optics, as it transmits light with wavelengths between 870 nm and 17.2 μm.

Definition

Arsenic tri-selenide takes amorphous or glassy material. Strong absorption bands are observed when As₂O₃ is incorporated into the source materials or As₂O₃ is formed during fabrication by oxidetion. As2O3 takes the cubic system, the monoclinic system, and the glassy state. The strong absorption bands are observed at 1050, 805, and 480 cm^-1 for the cubic crystal system, at 1100, 805 cm^-1 for the monoclinic crystal system and at 805 and 630 cm^-1 for the glassy material. The absorptions in the transmittance spectrum T₂ agree with either of these absorption bands.

Production Methods

As and Se are encapsuled into a quartz tube in vacuum and the tube is put into a rocking furnace. The capsule is heated at the temperature slightly higher than the melting point and rocked to mix each component completely followed by slow cooling.

Safety Profile

Low toxicity by ingestion. Whenheated to decomposition it emits toxic vapors of As andSe.

Properties of ARSENIC (III) SELENIDE

Melting point:	360°C
Density	4,75 g/cm³
solubility	insoluble in H2O; soluble in alkaline solutions
form	crystal
Specific Gravity	4.75
color	black
Water Solubility	Soluble in nitric acid. Insoluble in water.
Merck	14,805
Exposure limits	ACGIH: TWA 0.01 mg/m3; TWA 0.2 mg/m3 NIOSH: IDLH 5 mg/m3; IDLH 1 mg/m3; TWA 0.2 mg/m3; Ceiling 0.002 mg/m3
CAS DataBase Reference	1303-36-2(CAS DataBase Reference)
EPA Substance Registry System	Arsenic selenide (As2Se3) (1303-36-2)

Safety information for ARSENIC (III) SELENIDE

Pictogram(s)	Skull and Crossbones Acute Toxicity GHS06 Environment GHS09
GHS Hazard Statements	H330:Acute toxicity,inhalation H400:Hazardous to the aquatic environment, acute hazard H410:Hazardous to the aquatic environment, long-term hazard
Precautionary Statement Codes	P260:Do not breathe dust/fume/gas/mist/vapours/spray. P284:Wear respiratory protection. P320:Specific treatment is urgent (see … on this label). P304+P340:IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing. P405:Store locked up.