Question

[Fe(CN)₆]^4- is a coordination complex ion.

(1) Calculate the oxidation number of iron in the complex.

(2) Is the complex ion diamagnetic or paramagnetic?

(3) What is the hybridisation state of the central metal atom ?

(4) Write the IUPAC name of the complex ion.

Answer 1

(1) x + 6(-1) = -4 ⇒ x = +2

(2) Fe²⁺ (3d⁶ ) has no unpaired electrons, it is diamagnetic 

(3) d²sp³

(4) hexacyanoferrate (II) ion.