Question

What is the correct IUPAC name of K2[Ni(CN)4] is Potassium tetracyanonickelate(II) OR Potassium tetracyanidonickelate(II) ?

Answer 1

The correct name of K2[Ni(CN)4]  is Potassium tetra cyano nickelate. as it is an anionic ligands,so the ending of cyanide is changed into cyano. 

Answer 2

Answer : The IUPAC name of $K_2[Ni(CN)_4]$ is, Potassium tetracyanonickelate(II)

Explanation :

Rules for naming of the coordination compounds :

• The ligand named first then metal.
• The charge of metal indicated with the Roman numerals and enclosed in the parenthesis after metal name.
• The ligands are named in alphabetical order before the metal ion.
• Ligands that include a numerical prefix in the name use the prefixes bis for 2, tris for 3, or tetrakis for 4 to indicate their number.
• If the complex ion is an anion, we drop the ending of the metal name and add –ate.

In the given coordination compound, Ni is the nickel metal, CN is the ligand named as cyano.

Hence, the IUPAC name of $K_2[Ni(CN)_4]$ is, Potassium tetracyanonickelate(II)