Molybdenum disulfide

Molybdenum disulfide

Names
IUPAC name Molybdenum disulfide
Identifiers
CAS Number	1317-33-5 Y
3D model (Jmol)	Interactive image
ChEBI	CHEBI:30704 Y
ChemSpider	14138 Y
ECHA InfoCard	100.013.877
PubChem	14823
RTECS number	QA4697000
InChI InChI=1S/Mo.2S Y Key: CWQXQMHSOZUFJS-UHFFFAOYSA-N Y 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	1,185 °C (2,165 °F; 1,458 K) or higher
Solubility in water	insoluble
Solubility	decomposed by aqua regia, hot sulfuric acid, nitric acid insoluble in dilute acids
Band gap	1.23 eV (3R), 1.23 eV (2H)
Magnetic susceptibility (χ)	−63.0·10−6 cm3/mol
Structure
Crystal structure	hP6, space group P6 3/mmc, No 194 (2H) hR9, space group 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−)
Hazards
Safety data sheet	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).
N  (what is YN ?)
Infobox references

hR9, space group R3m, No 160 (3R)

Molybdenum disulfide is the inorganic compound composed of only two elements: molybdenum and sulfur. Its chemical formula is MoS
2.

The compound is classified as a 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 solid lubricant because of its low friction properties and robustness. Bulk MoS
2 is a diamagnetic, indirect bandgap semiconductor similar to silicon, with a bandgap of 1.23 eV.

Molybdenite ore is processed by flotation to give relatively pure MoS
2, the main contaminant being carbon. MoS
2 also arises by the thermal treatment of virtually all molybdenum compounds with hydrogen sulfide or elemental sulfur and can be produced by metathesis reactions from molybdenum pentachloride.