Molybdenum(V) chloride

Molybdenum pentachloride

A black solid with a pungent odor

Fixed

2.928 g · cm -3

194 ° C.

268 ° C

2,33 hPa ( 25 ° C)

Decomposes in water with vigorous reaction

Risk

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Molybdenum ( V) chloride is an inorganic chemical compound of molybdenum from the group of chlorides.

Production and representation

Molybdenum ( V) chloride can be obtained in a stream of hydrogen from the reaction of molybdenum chloride.

It can also be obtained by reaction of molybdenum ( VI) oxide with carbon tetrachloride under pressure.

Properties

Molybdenum (V ) chloride is a non-flammable, extremely hygroscopic, blue-black, paramagnetic solid with a pungent odor, which decomposes in water with a violent reaction. Does he have a dark green color, this is caused by the presence of oxychlorides. The compound is soluble in alcohol and hydrogen (dark green solution ) under solvolysis. It is undecomposed soluble in organic solvents such as ether, trichloromethane, carbon tetrachloride (dark red solution ), carbon disulfide. Molybdenum (V ) chloride has a monoclinic crystal structure with space group C2 / m (a = 1731 pm, b = 1781 pm, c = 607.9 pm, β = 95.7 °). It does not correspond to that of niobium ( V) chloride. In addition to the α - form and three other modifications are known. The β - form has a triclinic crystal structure with space group P1, the γ - form of an orthorhombic crystal structure with space group Pnma and the δ - form a monoclinic crystal structure with space group P21 / c.

Molybdenum ( V) chloride is present in solid form as a dimer, while it looks red in a gaseous state and exists as a monomer.

Use

Molybdenum ( V) chloride, molybdenum is used to deposit.