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+ Inorganic chemistry
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Posted by
Kevin Cottrell

What is the oxidation state of [v(co) 6]-1?

Chuck Darney  Follow

The electronic configuration of Vanadium is [Ar]3d3 4s2 (atomic no of 23 )

# In the complex V(CO)6 , Vanadium hexacarbonyl , Vanadium has 5 valence electrons.

# Whereas the neutral CO ligand contributes 2 electron each

So Effective atomic number(EAN) becomes

EAN = [5 +(2×6)] = 17

So the charge required to make V(CO)6 an 18 electron compound is -1. Then Vanadium will contain -1 charge and the overall complex will be [V(CO)6]^-1 i.e a monoanionic species

Part of interest…..

1) It should be noted that V(CO)6 is an exception of 18 electron rule. Another exceptions are Mn(CO)5 or [Fe(C5H5)2]+ .

2 ) The complex [V(CO)6] has low boiling point of 50°C which can be easily reduced to the monoanionic species.

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