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.

Names



Preferred IUPAC name Arsenic trisulfide
Other names Arsenic(III) sulfide Orpiment Sulphuret of arsenic
Identifiers
CAS Number	1303-33-9^Y
3D model (JSmol)	Interactive image
ChemSpider	21241348^Y
ECHA InfoCard	100.013.744
EC Number	215-117-4
PubChem CID	4093503
RTECS number	CG2638000
UNII	44SIJ800OX^Y
CompTox Dashboard (EPA)	DTXSID50274153
InChI InChI=1S/As4S6/c5-1-6-3-8-2(5)9-4(7-1)10-3^Y Key: OUFDYFBZNDIAPD-UHFFFAOYSA-N^Y 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). Y verify (what is ^YN ?) Infobox references