Chemistry informtion about Molybdenum(IV) Oxide (CAS NO.18868-43-4) is:
IUPAC Name: Dioxomolybdenum
Synonyms: Molybdenum Dioxide ; Molybdenum (Iv) Oxide ; Molybdenum Oxide ; Molybdenum Oxide Brown ; Molybdenum Oxide (Moo2) ; Molybdenumoxide(Moo2) ; Moo2 ; Molybdenum(Iv) Oxide, 99.95%
Product Categories: Inorganics ; Metal and Ceramic Science ; Molybdenum ; Oxides
MF: MoO₂
MW: 127.94
EINECS: 242-637-9
Density: 6.47 g/mL at 25 °C(lit.)
Following is the molecular structure of Molybdenum(IV) Oxide (CAS NO.18868-43-4) is:

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.Mineralogical form of this compound is called tugarinovite, only very rarely found.

Molybdenum(IV) Oxide (CAS NO.18868-43-4) can be prepared: by reduction of MoO₃ with Mo over the course of 70 hours at 800 °C. The tungsten analogue, WO₂, is prepared similarly.
2 MoO₃ + Mo → 3 MoO₂
by reducing MoO₃ with H₂ or NH₃ below 470°C [2]
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:
2 MoS₂ + 7O₂ → 2MoO₃ + 4SO₂
MoS₂ + 6MoO₃ → 7MoO₂ + 2SO₂
2 MoO₂ + O₂ → 2MoO₃

Reported in EPA TSCA Inventory.

Poison by subcutaneous route. Incandescent reaction with air. When heated to decomposition it emits toxic fumes of Mo. See also MOLYBDENUM COMPOUNDS.
Hazard Codes:
Xn
Risk Statements:
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements:
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36:Wear suitable protective clothing.
WGK Germany: 1
RTECS: QA4688000

OSHA PEL: TWA 10 mg(Mo)/m³, total dust; TWA 5 mg(Mo)/m³, respirable fraction
ACGIH TLV: Insoluble Compounds: inhalable fraction, 10 mg(Mo)/m³, 3 mg(Mo)/m³, respirable fraction.

Molybdenum(IV) Oxide (CAS NO.18868-43-4) 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 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.