Question

The I.U.P.A.C name of the coordination compound $K_3\left[Fe\right(CN{)}_6]$ is :

• A. Potassium hexacyanidoferrate$\left(II\right)$
• B. Potassium hexacyanidoferrate$\left(III\right)$
• C. Potassium hexacyanidoiron$\left(II\right)$
• D. Tripotassium hexacyanidoiron$\left(II\right)$

Answer 1

Answer: (B)

Potassium hexacyanidoferrate$\left(III\right)$

Option (B) is correct. The I.U.P.A.C name of the coordination compound $K_3\left[Fe\right(CN{)}_6]$ is potassium hexacyanidoferrate(III)

In this complex, there are six $CN$ so they are named as hexacyanido and cyanide ligand has -1 charge. So the iron overall has -3 charge, so the name of central metal atom ends with -ate followed by the charge in roman letters.

Thus, the name of complex is Potassium hexacyanidoferrate(III)