Molybdenum disulfide

Molybdenum disulfide
Molybdenum disulfide
Names
IUPAC name
Molybdenum disulfide
Other names
Molybdenum(IV) sulfide
Identifiers
3D model (JSmol)
ChEBI
ChemSpider
ECHA InfoCard 100.013.877 Edit this at Wikidata
RTECS number
  • QA4697000
UNII
  • InChI=1S/Mo.2S checkY
    Key: CWQXQMHSOZUFJS-UHFFFAOYSA-N checkY
  • InChI=1/Mo.2S/rMoS2/c2-1-3
    Key: CWQXQMHSOZUFJS-FRBXWHJUAU
  • S=[Mo]=S
Properties
MoS2
Molar mass 160.07 g·mol−1
Appearance black/lead-gray solid
Density 5.06 g/cm3[1]
Melting point 2,375 °C (4,307 °F; 2,648 K)[4]
insoluble[1]
Solubility decomposed by aqua regia, hot sulfuric acid, nitric acid
insoluble in dilute acids
Band gap 1.23 eV (indirect, 3R or 2H bulk)[2]
~1.8 eV (direct, monolayer)[3]
Structure
hP6, P6
3
/mmc
, No. 194 (2H)

hR9, R3m, No 160 (3R)[5]

a = 0.3161 nm (2H), 0.3163 nm (3R), c = 1.2295 nm (2H), 1.837 (3R)
Trigonal prismatic (MoIV)
Pyramidal (S2−)
Thermochemistry
62.63 J/(mol·K)
−235.10 kJ/mol
−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).
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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]

  1. ^ 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.
  2. ^ 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.
  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.
  4. ^ "Molybdenum Disulfide". PubChem. Retrieved August 31, 2018.
  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.
  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