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)	DTXSID201318098 DTXSID5042162, DTXSID201318098 ;
	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	MoS2
Molar mass	160.07 g·mol−1
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 MoS₂.

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.^[6] MoS₂ 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 MoS₂ is a diamagnetic, indirect bandgap semiconductor similar to silicon, with a bandgap of 1.23 eV.^[2]

^ ^a ^b Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.76. ISBN 1-4398-5511-0.
^ ^a ^b Kobayashi, K.; Yamauchi, J. (1995). "Electronic structure and scanning-tunneling-microscopy image of molybdenum dichalcogenide surfaces". Physical Review B. 51 (23): 17085–17095. Bibcode:1995PhRvB..5117085K. doi:10.1103/PhysRevB.51.17085. PMID 9978722.
^ Yun, Won Seok; Han, S. W.; Hong, Soon Cheol; Kim, In Gee; Lee, J. D. (2012). "Thickness and strain effects on electronic structures of transition metal dichalcogenides: 2H-MX₂ semiconductors (M = Mo, W; X = S, Se, Te)". Physical Review B. 85 (3): 033305. Bibcode:2012PhRvB..85c3305Y. doi:10.1103/PhysRevB.85.033305.
^ "Molybdenum Disulfide". PubChem. Retrieved August 31, 2018.
^ Schönfeld, B.; Huang, J. J.; Moss, S. C. (1983). "Anisotropic mean-square displacements (MSD) in single-crystals of 2H- and 3R-MoS₂". Acta Crystallographica Section B. 39 (4): 404–407. Bibcode:1983AcCrB..39..404S. doi:10.1107/S0108768183002645.
^ Sebenik, Roger F. et al. (2005) "Molybdenum and Molybdenum Compounds", Ullmann's Encyclopedia of Chemical Technology. Wiley-VCH, Weinheim. doi:10.1002/14356007.a16_655

[b92-1] Haynes, William M., ed. (2011). CRC Handbook of Chemistry and Physics (92nd ed.). Boca Raton, FL: CRC Press. p. 4.76. ISBN 1-4398-5511-0.

[band-2] Kobayashi, K.; Yamauchi, J. (1995). "Electronic structure and scanning-tunneling-microscopy image of molybdenum dichalcogenide surfaces". Physical Review B. 51 (23): 17085–17095. Bibcode:1995PhRvB..5117085K. doi:10.1103/PhysRevB.51.17085. PMID 9978722.

[3] Yun, Won Seok; Han, S. W.; Hong, Soon Cheol; Kim, In Gee; Lee, J. D. (2012). "Thickness and strain effects on electronic structures of transition metal dichalcogenides: 2H-MX₂ semiconductors (M = Mo, W; X = S, Se, Te)". Physical Review B. 85 (3): 033305. Bibcode:2012PhRvB..85c3305Y. doi:10.1103/PhysRevB.85.033305.

[PubChemMoS2-4] "Molybdenum Disulfide". PubChem. Retrieved August 31, 2018.

[str-5] Schönfeld, B.; Huang, J. J.; Moss, S. C. (1983). "Anisotropic mean-square displacements (MSD) in single-crystals of 2H- and 3R-MoS₂". Acta Crystallographica Section B. 39 (4): 404–407. Bibcode:1983AcCrB..39..404S. doi:10.1107/S0108768183002645.

[ullmann-6] Sebenik, Roger F. et al. (2005) "Molybdenum and Molybdenum Compounds", Ullmann's Encyclopedia of Chemical Technology. Wiley-VCH, Weinheim. doi:10.1002/14356007.a16_655

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