Question

Give the IUPAC name of $N{a_4}\left[ {Fe{{\left( {CN} \right)}_5}NOS} \right]$.

Answer 1

Hint: The name of compounds is written by using the IUPAC rules of the naming of coordination compounds. Write the name of the cation part first then the name of the anion part. Write the name of the ligand in alphabetical order.

Complete answer:
For neutral ligand, the name of the compound is used as such but for water use ‘aqua’ for ammonia use ‘ammine’
For anionic ligands replace the
i) Ide with o.
ii) Ate with ato.
iii) Ite with ito.
Use Greek prefix to denote the number of the ligand. If the name of the ligand has a Greek prefix, then use bis for two, tris for three.
Write the name of the metal. For the cationic complex, write the metal name as such.
For anionic complexes, use the suffix ‘ate’.
 A ligand can be an anion or a neutral molecule that donates an electron pair to the complex (NH3, H2O, Cl-). The number of ligands that attach to a metal depends on whether the ligand is monodentate or polydentate. To begin naming coordination complexes, here are some things to keep in mind.
Ligands are named first in alphabetical order.
The name of the metal comes next.
The oxidation state of the metal follows, noted by a Roman numeral in parentheses (II, IV).
In the coordinate compound $N{a_4}\left[ {Fe{{\left( {CN} \right)}_5}NOS} \right]$ ,
The anionic ligands are cyano and nitrosothiol. The oxidation state of the metal is$ + 2$.
The name of $N{a_4}\left[ {Fe{{\left( {CN} \right)}_5}NOS} \right]$ is Sodium pentacyano nitrosyl thiol ferrate(II).

Note:
The name of cation and anion has a gap. The number of sodium ions is not shown. Only the name is shown because the sodium is a counter ion which is used to stabilize the charge of the complex, so the number of sodium ions is not shown.