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Molybdenum dioxide is the chemical compound with the formula MoO2. It is a violet-colored solid and is a metallic conductor. It crystallizes in a monoclinic cell, and has a distorted rutile, (TiO2) crystal structure. In TiO2 the oxide anions are close packed and titanium atoms occupy half of the octahedral interstices (holes). In MoO2 the octahedra are distorted, the Mo atoms are off-centre, leading to alternating short and long Mo – Mo distances. The short Mo – Mo distance is 251 pm which is less than the Mo – Mo distance in the metal, 272.5 pm. The bond length is shorter than would be expected for a single bond. The bonding is complex and involves a delocalisation of some of the Mo electrons in a conductance band accounting for the metallic conductivity.
Additional recommended knowledge
Single crystals are obtained by chemical transport using iodine. Iodine reversibly converts MoO2 into the volatile species MoO2I2.
Molybdenum oxide is a constituent of "technical molybdenum oxide" produced during the industrial processing of MoS2:
MoO2 has been reported as catalysing the dehydrogenation of alcohols and the reformation of hydrocarbons. Molybdenum nano-wires have been produced by reducing MoO2 deposited on graphite
Categories: Molybdenum compounds | Oxides
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Molybdenum_dioxide". A list of authors is available in Wikipedia.|