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Home >1317-33-5>Q&A>Why in molybdenum disulfide the oxidation state of Mo is IV?

Why in molybdenum disulfide the oxidation state of Mo is IV?

Answer Follow +1
Underwood Answered Sep 07 2021

On one hand, stoichiometrically, it makes sense that in MoSX2 the Mo would have +4 and each sulfur would have -2.

MoS2 lattice(source)

However, in reality, every Mo atom is bonded to 6 sulfur atoms and every S atom is bonded to 3 Mo atoms. Why in such a complex configuration is it still correct to assign such oxidation numbers? Mo participates in 6 bonds, so how are they translated into an oxidation state of 4?

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Appearance dark grey or black powder
Density 5.06g/mLat 25°C(lit.)
Melting Point 2375 °C
Boiling Point 450ºC, sublimes
Vapour 12600mmHg at 25°C
Flash Point °C
Solubility INSOL IN WATER OR DIL ACIDS
SOL IN HOT SULFURIC ACID, AQUA REGIA, NITRIC ACID
Color/Form LEAD-GRAY, LUSTROUS POWDER
Black luster, hexagonal crystals
Stability Stable. Incompatible with oxidizing agents, acids.
HS Code 28309090
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