Arsenic trisulfide

Arsenic trisulfide
Names
	Preferred IUPAC name Arsenic trisulfide
	Other names Arsenic(III) sulfide; Orpiment; Sulphuret of arsenic;
Identifiers
CAS Number	1303-33-9 ;
3D model (JSmol)	Interactive image;
ChemSpider	21241348 ;
ECHA InfoCard	100.013.744
EC Number	215-117-4;
PubChem CID	4093503;
RTECS number	CG2638000;
UNII	44SIJ800OX ;
CompTox Dashboard (EPA)	DTXSID50274153 ;
	InChI InChI=1S/As4S6/c5-1-6-3-8-2(5)9-4(7-1)10-3 Key: OUFDYFBZNDIAPD-UHFFFAOYSA-N ; InChI=1/As4S6/c5-1-6-3-8-2(5)9-4(7-1)10-3 Key: OUFDYFBZNDIAPD-UHFFFAOYAM;
	SMILES S1[As]3S[As]2S[As](S[As]1S2)S3;
Properties
Chemical formula	As2S3
Molar mass	246.02 g·mol−1
Appearance	yellow or orange crystals
Density	3.43 g/cm3
Melting point	310 °C (590 °F; 583 K)
Boiling point	707 °C (1,305 °F; 980 K)
Solubility in water	insoluble
Solubility	soluble in ammonia
Magnetic susceptibility (χ)	−70.0·10−6 cm3/mol
Structure
Crystal structure	monoclinic
Space group	P21/n (No. 11)
Lattice constant	a = 1147.5(5) pm, b = 957.7(4) pm, c = 425.6(2) pm α = 90°, β = 90.68(8)°, γ = 90°
Coordination geometry	pyramidal (As)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H300, H331, H400, H411
NFPA 704 (fire diamond)	3 0 0
	NIOSH (US health exposure limits):
PEL (Permissible)	[1910.1018] TWA 0.010 mg/m3
REL (Recommended)	Ca C 0.002 mg/m3 [15-minute]
IDLH (Immediate danger)	Ca [5 mg/m3 (as As)]
Related compounds
Related compounds	Arsenic trioxide; Arsenic triselenide; Arsenic tritelluride; Phosphorus trisulfide; Antimony trisulfide; Bismuth trisulfide; Tetraarsenic tetrasulfide;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Arsenic trisulfide is the inorganic compound with the formula As₂S₃. It is a dark yellow solid that is insoluble in water. It also occurs as the mineral orpiment (Latin: auripigmentum), which has been used as a pigment called King's yellow. It is produced in the analysis of arsenic compounds. It is a group V/VI, intrinsic p-type semiconductor and exhibits photo-induced phase-change properties.

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