Molybdenum disulfide

Molybdenum disulfide
Names
	IUPAC name Molybdenum disulfide
	Other names Molybdenum(IV) sulfide
Identifiers
CAS Number	1317-33-5 ;
3D model (JSmol)	Interactive image;
ChEBI	CHEBI:30704 ;
ChemSpider	14138 ;
ECHA InfoCard	100.013.877
PubChem CID	14823;
RTECS number	QA4697000;
UNII	ZC8B4P503V ;
CompTox Dashboard (EPA)	DTXSID5042162 ;
	InChI InChI=1S/Mo.2S Key: CWQXQMHSOZUFJS-UHFFFAOYSA-N ; InChI=1/Mo.2S/rMoS2/c2-1-3 Key: CWQXQMHSOZUFJS-FRBXWHJUAU;
	SMILES S=[Mo]=S;
Properties
Chemical formula	MoS; 2
Molar mass	160.07 g/mol
Appearance	black/lead-gray solid
Density	5.06 g/cm3
Melting point	2,375 °C (4,307 °F; 2,648 K)
Solubility in water	insoluble
Solubility	decomposed by aqua regia, hot sulfuric acid, nitric acid ; insoluble in dilute acids
Band gap	1.23 eV (indirect, 3R or 2H bulk); ~1.8 eV (direct, monolayer)
Structure
Crystal structure	hP6, P6; 3/mmc, No. 194 (2H); hR9, R3m, No 160 (3R)
Lattice constant	a = 0.3161 nm (2H), 0.3163 nm (3R), c = 1.2295 nm (2H), 1.837 (3R)
Coordination geometry	Trigonal prismatic (MoIV); Pyramidal (S2−)
Thermochemistry
Std molar; entropy (S⦵298)	62.63 J/(mol K)
Std enthalpy of; formation (ΔfH⦵298)	-235.10 kJ/mol
Gibbs free energy (ΔfG⦵)	-225.89 kJ/mol
Hazards
Safety data sheet (SDS)	External MSDS
Related compounds
Other anions	Molybdenum(IV) oxide ; Molybdenum diselenide ; Molybdenum ditelluride
Other cations	Tungsten disulfide
Related lubricants	Graphite
	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

Molybdenum disulfide (or moly) is an inorganic compound composed of molybdenum and sulfur. Its chemical formula is MoS
₂.

The compound is classified as a transition metal dichalcogenide. It is a silvery black solid that occurs as the mineral molybdenite, the principal ore for molybdenum. MoS
₂ is relatively unreactive. It is unaffected by dilute acids and oxygen. In appearance and feel, molybdenum disulfide is similar to graphite. It is widely used as a dry lubricant because of its low friction and robustness. Bulk MoS
₂ is a diamagnetic, indirect bandgap semiconductor similar to silicon, with a bandgap of 1.23 eV.

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