Name: CFT: Theory of Coordination Compounds
Uploaded: 2019-07-19
Duration: 6 min 25 s
Description: There are various theories to explain bonding in coordination compounds. Crystal field theory is one of those theories. It explains many properties.

Question

Write down the IUPAC name of $K_{2} [{HgI}_{4}]$ .

Accepted Answer

$K_{2} [{HgI}_{4}]$ gives $K^{+}$ cation and ${[{HgI}_{4}]}^{2 -}$ anion.

Here, $I$ is a negatively charged ligand with $- 1$ charge on it.

Now, let the oxidation state of $Hg$ be $x$ .

$\Rightarrow 2 (+ 1) + x + 4 (- 1) = 0 \Rightarrow 2 + x - 4 = 0 \Rightarrow x - 2 = 0 \Rightarrow x = 2$

Following things are to be kept in mind while writing the IUPAC name of an anionic complex:

1) While writing the IUPAC name of the complex cationic part of the complex is written first and then the anionic part.

2) Ligands are written in alphabetical order, mentioning their respective numbers with prefixes such as tetra, tri, di, penta, etc., followed by their names. Here, we have a total $4$ ions of the ligand $I^{-}$ .

3) Since the complex ion is negatively charged, the central metal ion's name should end with the suffix 'ate', and its oxidation number should be written in Roman numeral beside it in round brackets.

4) It must be noted that the names of all chemical species should start with small letters, and must not start with capital letters.

So, the IUPAC name of the complex $K_{2} [{HgI}_{4}]$ will be potassium tetraiodomercurate(II).

Write down the IUPAC name of $K_{2} [{HgI}_{4}]$ .

Important Questions on Coordination Compounds

Learn and Prepare for any exam you want !

Write down the IUPAC name of K2HgI4.

Important Questions on Coordination Compounds

Learn and Prepare for any exam you want !

Write down the IUPAC name of $K_{2} [{HgI}_{4}]$ .