Disulfur dichloride

Disulfur dichloride
	Sulfur, S Chlorine, Cl
Names
	IUPAC name Disulfur dichloride
	Systematic IUPAC name Dichlorodisulfane
	Other names Bis[chloridosulfur](S–S); Dimeric sulfenic chloride; Sulfur monochloride (incorrect name);
Identifiers
CAS Number	10025-67-9 ; 85408-26-0 (isobutenate) ;
3D model (JSmol)	Interactive image;
ChemSpider	23192 ; 19158348 (isobutenate) ;
DrugBank	DB14647;
ECHA InfoCard	100.030.021
EC Number	233-036-2;
MeSH	Sulfur+monochloride
PubChem CID	24807;
RTECS number	WS4300000;
UNII	NJ7YR2EV0D ;
UN number	3390
CompTox Dashboard (EPA)	DTXSID3042427 ;
	InChI InChI=1S/Cl2S2/c1-3-4-2 Key: PXJJSXABGXMUSU-UHFFFAOYSA-N ; InChI=1/Cl2S2/c1-3-4-2 Key: PXJJSXABGXMUSU-UHFFFAOYAK;
	SMILES ClSSCl;
Properties
Chemical formula	S2Cl2
Molar mass	135.02 g·mol−1
Appearance	Light-amber to yellow-red, oily liquid
Odor	pungent, nauseating, irritating
Density	1.688 g/cm3
Melting point	−80 °C (−112 °F; 193 K)
Boiling point	137.1 °C (278.8 °F; 410.2 K)
Solubility in water	Decomposes, with loss of HCl
Solubility	Soluble in ethanol, benzene, ether, THF, chloroform, CCl4
Vapor pressure	7 mmHg (20 °C)
Magnetic susceptibility (χ)	−62.2·10−6 cm3/mol
Refractive index (nD)	1.658
Structure
Point group	C2
Coordination geometry	2 at sulfur atoms
Molecular shape	gauche
Dipole moment	1.60 D
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H301, H314, H332, H400
Precautionary statements	P260, P261, P264, P270, P271, P273, P280, P301+P310, P301+P330+P331, P303+P361+P353, P304+P312, P304+P340, P305+P351+P338, P310, P312, P321, P330, P363, P391, P405, P501
NFPA 704 (fire diamond)	2 1 1
Flash point	118.5 °C (245.3 °F; 391.6 K)
Autoignition; temperature	234 °C (453 °F; 507 K)
	Lethal dose or concentration (LD, LC):
LCLo (lowest published)	150 ppm (mouse, 1 min) (1 ppm = 5.52 mg/m3)
	NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 ppm (5.52 mg/m3)
REL (Recommended)	C 1 ppm (5.52 mg/m3)
IDLH (Immediate danger)	5 ppm (1 ppm = 5.52 mg/m3)
Safety data sheet (SDS)	ICSC 0958
Related compounds
Related sulfur chlorides/oxychlorides	Sulfur dichloride; Thionyl chloride; Sulfuryl chloride;
Related compounds	Hydrogen disulfide; Disulfur difluoride; Disulfur dibromide; Disulfur diiodide; Dimethyl disulfide; Diphenyl disulfide; Diselenium dichloride;
	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

Disulfur dichloride (or disulphur dichloride by the British English spelling) is the inorganic compound of sulfur and chlorine with the formula S₂Cl₂. It is an amber oily liquid.

Sometimes, this compound is incorrectly named sulfur monochloride (or sulphur monochloride by the British English spelling), the name implied by its empirical formula SCl.

S₂Cl₂ has the structure implied by the formula Cl−S−S−Cl, wherein the dihedral angle between the Cl^a−S−S and S−S−Cl^b planes is 85.2°. This structure is referred to as gauche, and is akin to that for H₂O₂. A rare isomer of S₂Cl₂ is S=SCl₂ (thiothionyl chloride); this isomer forms transiently when S₂Cl₂ is exposed to UV-radiation (see thiosulfoxides).

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